From e278fc1d20907ed1b18fa254ff7fe21162e08745 Mon Sep 17 00:00:00 2001
From: Luiz <lucachaves@gmail.com>
Date: Sun, 10 Mar 2024 13:30:34 -0300
Subject: [PATCH] node teste em function

---
 ...le.test.js => area-of-circle.jest.test.js} |  0
 .../_codes/js/code/area-of-circle.js          |  4 +-
 .../js/code/area-of-circle.node.test.js       | 15 ++++
 .../_codes/js/code/area-of-circle.print.js    |  2 +-
 .../_codes/js/code/package.json               |  3 +
 ...le.test.js => area-of-circle.jest.test.js} | 16 ++--
 .../_codes/js/response/area-of-circle.js      |  8 +-
 .../js/response/area-of-circle.node.test.js   | 15 ++++
 .../js/response/area-of-circle.print.js       | 12 ++-
 .../_codes/js/response/package.json           |  3 +
 .../code/{calc.test.js => calc.jest.test.js}  |  0
 .../function-calc/_codes/js/code/calc.js      |  4 +-
 .../_codes/js/code/calc.node.test.js          | 27 +++++++
 .../function-calc/_codes/js/code/package.json |  3 +
 .../{calc.test.js => calc.jest.test.js}       |  0
 .../function-calc/_codes/js/response/calc.js  |  6 +-
 .../_codes/js/response/calc.node.test.js      | 27 +++++++
 .../_codes/js/response/package.json           |  3 +
 ...calendar.test.js => calendar.jest.test.js} |  0
 .../_codes/js/code/calendar.js                |  4 +-
 .../_codes/js/code/calendar.node.test.js      | 68 +++++++++++++++++
 .../_codes/js/code/package.json               |  3 +
 ...calendar.test.js => calendar.jest.test.js} |  0
 .../_codes/js/response/calendar.js            |  4 +-
 .../_codes/js/response/calendar.node.test.js  | 68 +++++++++++++++++
 .../_codes/js/response/package.json           |  3 +
 ...ctorial.test.js => factorial.jest.test.js} |  0
 .../_codes/js/code/factorial.js               |  4 +-
 .../_codes/js/code/factorial.node.test.js     | 17 +++++
 .../_codes/js/code/package.json               |  3 +
 ...ctorial.test.js => factorial.jest.test.js} |  0
 .../_codes/js/response/factorial.js           |  6 +-
 .../_codes/js/response/factorial.node.test.js | 17 +++++
 .../_codes/js/response/package.json           |  3 +
 ....test.js => fibonacci-number.jest.test.js} |  0
 .../_codes/js/code/fibonacci-number.js        |  4 +-
 .../js/code/fibonacci-number.node.test.js     | 19 +++++
 .../_codes/js/code/package.json               |  3 +
 ....test.js => fibonacci-number.jest.test.js} |  0
 .../_codes/js/response/fibonacci-number.js    |  6 +-
 .../js/response/fibonacci-number.node.test.js | 19 +++++
 .../_codes/js/response/package.json           |  3 +
 ...est.js => fibonacci-sequence.jest.test.js} |  0
 .../_codes/js/code/fibonacci-sequence.js      |  4 +-
 .../js/code/fibonacci-sequence.node.test.js   | 19 +++++
 .../_codes/js/code/package.json               |  3 +
 ...est.js => fibonacci-sequence.jest.test.js} |  0
 .../_codes/js/response/fibonacci-sequence.js  |  4 +-
 .../response/fibonacci-sequence.node.test.js  | 19 +++++
 .../_codes/js/response/package.json           |  3 +
 ...-text.test.js => figure-text.jest.test.js} |  0
 .../_codes/js/code/figure-text.js             | 12 ++-
 .../_codes/js/code/figure-text.node.test.js   | 75 +++++++++++++++++++
 .../_codes/js/code/package.json               |  3 +
 ...-text.test.js => figure-text.jest.test.js} |  0
 .../_codes/js/response/figure-text.js         | 11 ++-
 .../js/response/figure-text.node.test.js      | 75 +++++++++++++++++++
 .../_codes/js/response/package.json           |  3 +
 .../_codes/js/code/package.json               |  3 +
 ...ime-nth.test.js => prime-nth.jest.test.js} |  0
 .../_codes/js/code/prime-nth.js               |  4 +-
 .../_codes/js/code/prime-nth.node.test.js     | 13 ++++
 .../_codes/js/response/package.json           |  3 +
 ...ime-nth.test.js => prime-nth.jest.test.js} |  0
 .../_codes/js/response/prime-nth.js           |  6 +-
 .../_codes/js/response/prime-nth.node.test.js | 13 ++++
 .../_codes/js/code/package.json               |  3 +
 .../{prime.test.js => prime.jest.test.js}     |  0
 .../function-prime/_codes/js/code/prime.js    |  4 +-
 .../_codes/js/code/prime.node.test.js         | 21 ++++++
 .../_codes/js/response/package.json           |  3 +
 .../{prime.test.js => prime.jest.test.js}     |  0
 .../_codes/js/response/prime.js               |  7 +-
 .../_codes/js/response/prime.node.test.js     | 21 ++++++
 .../function-sum/_codes/js/code/package.json  |  3 +
 .../js/code/{sum.test.js => sum.jest.test.js} |  0
 .../function-sum/_codes/js/code/sum.js        |  4 +-
 .../_codes/js/code/sum.node.test.js           | 13 ++++
 .../_codes/js/response/package.json           |  3 +
 .../{sum.test.js => sum.jest.test.js}         |  0
 .../function-sum/_codes/js/response/sum.js    |  4 +-
 .../_codes/js/response/sum.node.test.js       | 13 ++++
 .../_codes/js/code/package.json               |  3 +
 ....test.js => triangle-checker.jest.test.js} |  0
 .../_codes/js/code/triangle-checker.js        |  4 +-
 .../js/code/triangle-checker.node.test.js     | 32 ++++++++
 .../_codes/js/response/package.json           |  3 +
 ....test.js => triangle-checker.jest.test.js} |  0
 .../_codes/js/response/triangle-checker.js    |  4 +-
 .../js/response/triangle-checker.node.test.js | 32 ++++++++
 90 files changed, 754 insertions(+), 98 deletions(-)
 rename src/pages/exercises/function-area-of-circle/_codes/js/code/{area-of-circle.test.js => area-of-circle.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.node.test.js
 create mode 100644 src/pages/exercises/function-area-of-circle/_codes/js/code/package.json
 rename src/pages/exercises/function-area-of-circle/_codes/js/response/{area-of-circle.test.js => area-of-circle.jest.test.js} (50%)
 create mode 100644 src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.node.test.js
 create mode 100644 src/pages/exercises/function-area-of-circle/_codes/js/response/package.json
 rename src/pages/exercises/function-calc/_codes/js/code/{calc.test.js => calc.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-calc/_codes/js/code/calc.node.test.js
 create mode 100644 src/pages/exercises/function-calc/_codes/js/code/package.json
 rename src/pages/exercises/function-calc/_codes/js/response/{calc.test.js => calc.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-calc/_codes/js/response/calc.node.test.js
 create mode 100644 src/pages/exercises/function-calc/_codes/js/response/package.json
 rename src/pages/exercises/function-calendar/_codes/js/code/{calendar.test.js => calendar.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-calendar/_codes/js/code/calendar.node.test.js
 create mode 100644 src/pages/exercises/function-calendar/_codes/js/code/package.json
 rename src/pages/exercises/function-calendar/_codes/js/response/{calendar.test.js => calendar.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-calendar/_codes/js/response/calendar.node.test.js
 create mode 100644 src/pages/exercises/function-calendar/_codes/js/response/package.json
 rename src/pages/exercises/function-factorial/_codes/js/code/{factorial.test.js => factorial.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-factorial/_codes/js/code/factorial.node.test.js
 create mode 100644 src/pages/exercises/function-factorial/_codes/js/code/package.json
 rename src/pages/exercises/function-factorial/_codes/js/response/{factorial.test.js => factorial.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-factorial/_codes/js/response/factorial.node.test.js
 create mode 100644 src/pages/exercises/function-factorial/_codes/js/response/package.json
 rename src/pages/exercises/function-fibonacci-nth/_codes/js/code/{fibonacci-number.test.js => fibonacci-number.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.node.test.js
 create mode 100644 src/pages/exercises/function-fibonacci-nth/_codes/js/code/package.json
 rename src/pages/exercises/function-fibonacci-nth/_codes/js/response/{fibonacci-number.test.js => fibonacci-number.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.node.test.js
 create mode 100644 src/pages/exercises/function-fibonacci-nth/_codes/js/response/package.json
 rename src/pages/exercises/function-fibonacci-sequence/_codes/js/code/{fibonacci-sequence.test.js => fibonacci-sequence.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.node.test.js
 create mode 100644 src/pages/exercises/function-fibonacci-sequence/_codes/js/code/package.json
 rename src/pages/exercises/function-fibonacci-sequence/_codes/js/response/{fibonacci-sequence.test.js => fibonacci-sequence.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.node.test.js
 create mode 100644 src/pages/exercises/function-fibonacci-sequence/_codes/js/response/package.json
 rename src/pages/exercises/function-figure-text/_codes/js/code/{figure-text.test.js => figure-text.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-figure-text/_codes/js/code/figure-text.node.test.js
 create mode 100644 src/pages/exercises/function-figure-text/_codes/js/code/package.json
 rename src/pages/exercises/function-figure-text/_codes/js/response/{figure-text.test.js => figure-text.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-figure-text/_codes/js/response/figure-text.node.test.js
 create mode 100644 src/pages/exercises/function-figure-text/_codes/js/response/package.json
 create mode 100644 src/pages/exercises/function-prime-nth/_codes/js/code/package.json
 rename src/pages/exercises/function-prime-nth/_codes/js/code/{prime-nth.test.js => prime-nth.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.node.test.js
 create mode 100644 src/pages/exercises/function-prime-nth/_codes/js/response/package.json
 rename src/pages/exercises/function-prime-nth/_codes/js/response/{prime-nth.test.js => prime-nth.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.node.test.js
 create mode 100644 src/pages/exercises/function-prime/_codes/js/code/package.json
 rename src/pages/exercises/function-prime/_codes/js/code/{prime.test.js => prime.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-prime/_codes/js/code/prime.node.test.js
 create mode 100644 src/pages/exercises/function-prime/_codes/js/response/package.json
 rename src/pages/exercises/function-prime/_codes/js/response/{prime.test.js => prime.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-prime/_codes/js/response/prime.node.test.js
 create mode 100644 src/pages/exercises/function-sum/_codes/js/code/package.json
 rename src/pages/exercises/function-sum/_codes/js/code/{sum.test.js => sum.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-sum/_codes/js/code/sum.node.test.js
 create mode 100644 src/pages/exercises/function-sum/_codes/js/response/package.json
 rename src/pages/exercises/function-sum/_codes/js/response/{sum.test.js => sum.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-sum/_codes/js/response/sum.node.test.js
 create mode 100644 src/pages/exercises/function-triangle-checker/_codes/js/code/package.json
 rename src/pages/exercises/function-triangle-checker/_codes/js/code/{triangle-checker.test.js => triangle-checker.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.node.test.js
 create mode 100644 src/pages/exercises/function-triangle-checker/_codes/js/response/package.json
 rename src/pages/exercises/function-triangle-checker/_codes/js/response/{triangle-checker.test.js => triangle-checker.jest.test.js} (100%)
 create mode 100644 src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.node.test.js

diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.test.js b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.test.js
rename to src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.jest.test.js
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.js b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.js
index fd64f2a9..739a45d5 100644
--- a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.js
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.js
@@ -1,5 +1,3 @@
-function areaOfCircle(radius) {
+export function areaOfCircle(radius) {
   // TODO A = πr²
 }
-
-export { areaOfCircle };
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.node.test.js b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.node.test.js
new file mode 100644
index 00000000..f0fb7371
--- /dev/null
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.node.test.js
@@ -0,0 +1,15 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { areaOfCircle } from './area-of-circle.js';
+
+describe('Circle Tools', () => {
+  describe('areaOfCircle()', () => {
+    it('should calculate the area of the circle', () => {
+      assert.equal(areaOfCircle(10), 314.1592653589793);
+    });
+
+    it('should calculate the area of the circle', () => {
+      assert.equal(areaOfCircle(1), 3.141592653589793);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.print.js b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.print.js
index 6d393e9d..723d0932 100644
--- a/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.print.js
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/code/area-of-circle.print.js
@@ -1,4 +1,4 @@
-import { areaOfCircle } from "./area-of-circle-fn.js";
+import { areaOfCircle } from './area-of-circle-fn.js';
 
 // Circle Tools
 
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/code/package.json b/src/pages/exercises/function-area-of-circle/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.test.js b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.jest.test.js
similarity index 50%
rename from src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.test.js
rename to src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.jest.test.js
index 2e146095..868bce6d 100644
--- a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.test.js
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.jest.test.js
@@ -1,15 +1,11 @@
-import {
-  areaOfCircle
-} from './area-of-circle.js'
+import { areaOfCircle } from './area-of-circle.js';
 
 describe('Circle Tools', () => {
-
   test('Area of the circle of radius 10 is of 31.41592653589793', () => {
-    expect(areaOfCircle(10)).toBe(314.1592653589793)
-  })
+    expect(areaOfCircle(10)).toBe(314.1592653589793);
+  });
 
   test('Area of the circle of radius 1 is of 3.141592653589793', () => {
-    expect(areaOfCircle(1)).toBe(3.141592653589793)
-  })
-
-})
\ No newline at end of file
+    expect(areaOfCircle(1)).toBe(3.141592653589793);
+  });
+});
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.js b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.js
index 3565c4ee..09e8ba63 100644
--- a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.js
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.js
@@ -1,13 +1,11 @@
 // A = πr²
 
-function areaOfCircle(radius) {
+export function areaOfCircle(radius) {
   return Math.PI * radius ** 2;
 }
 
-const areaOfCircleWithAnonymous = function(radius) {
+export const areaOfCircleWithAnonymous = function (radius) {
   return Math.PI * radius ** 2;
 };
 
-const areaOfCircleWithArrow = radius => Math.PI * radius ** 2;
-
-export { areaOfCircle, areaOfCircleWithAnonymous, areaOfCircleWithArrow };
+export const areaOfCircleWithArrow = (radius) => Math.PI * radius ** 2;
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.node.test.js b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.node.test.js
new file mode 100644
index 00000000..f0fb7371
--- /dev/null
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.node.test.js
@@ -0,0 +1,15 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { areaOfCircle } from './area-of-circle.js';
+
+describe('Circle Tools', () => {
+  describe('areaOfCircle()', () => {
+    it('should calculate the area of the circle', () => {
+      assert.equal(areaOfCircle(10), 314.1592653589793);
+    });
+
+    it('should calculate the area of the circle', () => {
+      assert.equal(areaOfCircle(1), 3.141592653589793);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.print.js b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.print.js
index 55cd171b..cc4eeffd 100644
--- a/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.print.js
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/response/area-of-circle.print.js
@@ -1,13 +1,11 @@
-import {
-  areaOfCircle
-} from './area-of-circle.js'
+import { areaOfCircle } from './area-of-circle.js';
 
 // Circle Tools
 
 // Area of the circle of radius 10 is of 31.41592653589793
-console.log(areaOfCircle(10))
-console.log(314.1592653589793)
+console.log(areaOfCircle(10));
+console.log(314.1592653589793);
 
 // Area of the circle of radius 1 is of 3.141592653589793
-console.log(areaOfCircle(1))
-console.log(3.141592653589793)
\ No newline at end of file
+console.log(areaOfCircle(1));
+console.log(3.141592653589793);
diff --git a/src/pages/exercises/function-area-of-circle/_codes/js/response/package.json b/src/pages/exercises/function-area-of-circle/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-area-of-circle/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-calc/_codes/js/code/calc.test.js b/src/pages/exercises/function-calc/_codes/js/code/calc.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-calc/_codes/js/code/calc.test.js
rename to src/pages/exercises/function-calc/_codes/js/code/calc.jest.test.js
diff --git a/src/pages/exercises/function-calc/_codes/js/code/calc.js b/src/pages/exercises/function-calc/_codes/js/code/calc.js
index d1067ffb..a516777b 100644
--- a/src/pages/exercises/function-calc/_codes/js/code/calc.js
+++ b/src/pages/exercises/function-calc/_codes/js/code/calc.js
@@ -1,8 +1,6 @@
 /**
  * operator: '+', '-', '*', '/'
  */
-function calc(operand1, operand2, operator) {
+export function calc(operand1, operand2, operator) {
   // TODO
 }
-
-export { calc };
diff --git a/src/pages/exercises/function-calc/_codes/js/code/calc.node.test.js b/src/pages/exercises/function-calc/_codes/js/code/calc.node.test.js
new file mode 100644
index 00000000..376e79d9
--- /dev/null
+++ b/src/pages/exercises/function-calc/_codes/js/code/calc.node.test.js
@@ -0,0 +1,27 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { calc } from './calc.js';
+
+describe('Calculator', () => {
+  describe('calc()', () => {
+    it('should add values', () => {
+      assert.equal(calc(1, 1, '+'), 2);
+      assert.equal(calc(10, 5, '+'), 15);
+    });
+
+    it('should subtract values', () => {
+      assert.equal(calc(1, 1, '-'), 0);
+      assert.equal(calc(10, 5, '-'), 5);
+    });
+
+    it('should multiply values', () => {
+      assert.equal(calc(1, 1, '*'), 1);
+      assert.equal(calc(10, 5, '*'), 50);
+    });
+
+    it('should divide values', () => {
+      assert.equal(calc(1, 1, '/'), 1);
+      assert.equal(calc(10, 5, '/'), 2);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-calc/_codes/js/code/package.json b/src/pages/exercises/function-calc/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-calc/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-calc/_codes/js/response/calc.test.js b/src/pages/exercises/function-calc/_codes/js/response/calc.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-calc/_codes/js/response/calc.test.js
rename to src/pages/exercises/function-calc/_codes/js/response/calc.jest.test.js
diff --git a/src/pages/exercises/function-calc/_codes/js/response/calc.js b/src/pages/exercises/function-calc/_codes/js/response/calc.js
index 90f9310a..1c3a5ae0 100644
--- a/src/pages/exercises/function-calc/_codes/js/response/calc.js
+++ b/src/pages/exercises/function-calc/_codes/js/response/calc.js
@@ -1,7 +1,7 @@
 /**
  * operator: '+', '-', '*', '/'
  */
-function calc(operand1, operand2, operator) {
+export function calc(operand1, operand2, operator) {
   switch (operator) {
     case '+':
       return parseInt(operand1) + parseInt(operand2);
@@ -16,8 +16,6 @@ function calc(operand1, operand2, operator) {
 
 /* alternative answer. to undersand how eval works:
  * https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/eval */
-function calcWithEval(operand1, operand2, operator) {
+export function calcWithEval(operand1, operand2, operator) {
   return eval(operand1 + operator + operand2);
 }
-
-export { calc, calcWithEval };
diff --git a/src/pages/exercises/function-calc/_codes/js/response/calc.node.test.js b/src/pages/exercises/function-calc/_codes/js/response/calc.node.test.js
new file mode 100644
index 00000000..376e79d9
--- /dev/null
+++ b/src/pages/exercises/function-calc/_codes/js/response/calc.node.test.js
@@ -0,0 +1,27 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { calc } from './calc.js';
+
+describe('Calculator', () => {
+  describe('calc()', () => {
+    it('should add values', () => {
+      assert.equal(calc(1, 1, '+'), 2);
+      assert.equal(calc(10, 5, '+'), 15);
+    });
+
+    it('should subtract values', () => {
+      assert.equal(calc(1, 1, '-'), 0);
+      assert.equal(calc(10, 5, '-'), 5);
+    });
+
+    it('should multiply values', () => {
+      assert.equal(calc(1, 1, '*'), 1);
+      assert.equal(calc(10, 5, '*'), 50);
+    });
+
+    it('should divide values', () => {
+      assert.equal(calc(1, 1, '/'), 1);
+      assert.equal(calc(10, 5, '/'), 2);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-calc/_codes/js/response/package.json b/src/pages/exercises/function-calc/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-calc/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-calendar/_codes/js/code/calendar.test.js b/src/pages/exercises/function-calendar/_codes/js/code/calendar.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-calendar/_codes/js/code/calendar.test.js
rename to src/pages/exercises/function-calendar/_codes/js/code/calendar.jest.test.js
diff --git a/src/pages/exercises/function-calendar/_codes/js/code/calendar.js b/src/pages/exercises/function-calendar/_codes/js/code/calendar.js
index a139b136..ee4ce761 100644
--- a/src/pages/exercises/function-calendar/_codes/js/code/calendar.js
+++ b/src/pages/exercises/function-calendar/_codes/js/code/calendar.js
@@ -2,8 +2,6 @@
  * beginWeek: 0..6 - 0(DOM), 1(SEG), 2(TER), 3(QUA), 4(QUI), 5(SEX), 6(SAB)
  * endDay: 28..31
  */
-function calendar(beginWeek, endDay) {
+export function calendar(beginWeek, endDay) {
   // TODO
 }
-
-export { calendar };
diff --git a/src/pages/exercises/function-calendar/_codes/js/code/calendar.node.test.js b/src/pages/exercises/function-calendar/_codes/js/code/calendar.node.test.js
new file mode 100644
index 00000000..ce287497
--- /dev/null
+++ b/src/pages/exercises/function-calendar/_codes/js/code/calendar.node.test.js
@@ -0,0 +1,68 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { calendar } from './calendar.js';
+
+describe('Calendar Tool', () => {
+  describe('calendar()', () => {
+    it('making month starting on Sunday and ending on the 31st', () => {
+      assert.equal(
+        calendar(0, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+ 01  02  03  04  05  06  07
+ 08  09  10  11  12  13  14
+ 15  16  17  18  19  20  21
+ 22  23  24  25  26  27  28
+ 29  30  31`
+      );
+    });
+
+    it('making month starting on Monday and ending on the 31st', () => {
+      assert.equal(
+        calendar(1, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+     01  02  03  04  05  06
+ 07  08  09  10  11  12  13
+ 14  15  16  17  18  19  20
+ 21  22  23  24  25  26  27
+ 28  29  30  31`
+      );
+    });
+
+    it('making month starting on Tuesday and ending on the 30st', () => {
+      assert.equal(
+        calendar(2, 30),
+        `DOM SEG TER QUA QUI SEX SAB
+         01  02  03  04  05
+ 06  07  08  09  10  11  12
+ 13  14  15  16  17  18  19
+ 20  21  22  23  24  25  26
+ 27  28  29  30`
+      );
+    });
+
+    it('making month starting on Wednesday and ending on the 29st', () => {
+      assert.equal(
+        calendar(3, 29),
+        `DOM SEG TER QUA QUI SEX SAB
+             01  02  03  04
+ 05  06  07  08  09  10  11
+ 12  13  14  15  16  17  18
+ 19  20  21  22  23  24  25
+ 26  27  28  29`
+      );
+    });
+
+    it('making month starting on Saturday and ending on the 31st', () => {
+      assert.equal(
+        calendar(6, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+                         01
+ 02  03  04  05  06  07  08
+ 09  10  11  12  13  14  15
+ 16  17  18  19  20  21  22
+ 23  24  25  26  27  28  29
+ 30  31`
+      );
+    });
+  });
+});
diff --git a/src/pages/exercises/function-calendar/_codes/js/code/package.json b/src/pages/exercises/function-calendar/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-calendar/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-calendar/_codes/js/response/calendar.test.js b/src/pages/exercises/function-calendar/_codes/js/response/calendar.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-calendar/_codes/js/response/calendar.test.js
rename to src/pages/exercises/function-calendar/_codes/js/response/calendar.jest.test.js
diff --git a/src/pages/exercises/function-calendar/_codes/js/response/calendar.js b/src/pages/exercises/function-calendar/_codes/js/response/calendar.js
index 10389484..4ddd3ec9 100644
--- a/src/pages/exercises/function-calendar/_codes/js/response/calendar.js
+++ b/src/pages/exercises/function-calendar/_codes/js/response/calendar.js
@@ -2,7 +2,7 @@
  * beginWeek: 0..6 - 0(DOM), 1(SEG), 2(TER), 3(QUA), 4(QUI), 5(SEX), 6(SAB)
  * endDay: 28..31
  */
-function calendar(beginWeek, endDay) {
+export function calendar(beginWeek, endDay) {
   let result = 'DOM SEG TER QUA QUI SEX SAB\n';
 
   for (let times = 0; times < beginWeek; times++) {
@@ -15,5 +15,3 @@ function calendar(beginWeek, endDay) {
     result += (day + beginWeek) % 7 == 0 ? '\n' : ' ';
   }
 }
-
-export { calendar };
diff --git a/src/pages/exercises/function-calendar/_codes/js/response/calendar.node.test.js b/src/pages/exercises/function-calendar/_codes/js/response/calendar.node.test.js
new file mode 100644
index 00000000..ce287497
--- /dev/null
+++ b/src/pages/exercises/function-calendar/_codes/js/response/calendar.node.test.js
@@ -0,0 +1,68 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { calendar } from './calendar.js';
+
+describe('Calendar Tool', () => {
+  describe('calendar()', () => {
+    it('making month starting on Sunday and ending on the 31st', () => {
+      assert.equal(
+        calendar(0, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+ 01  02  03  04  05  06  07
+ 08  09  10  11  12  13  14
+ 15  16  17  18  19  20  21
+ 22  23  24  25  26  27  28
+ 29  30  31`
+      );
+    });
+
+    it('making month starting on Monday and ending on the 31st', () => {
+      assert.equal(
+        calendar(1, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+     01  02  03  04  05  06
+ 07  08  09  10  11  12  13
+ 14  15  16  17  18  19  20
+ 21  22  23  24  25  26  27
+ 28  29  30  31`
+      );
+    });
+
+    it('making month starting on Tuesday and ending on the 30st', () => {
+      assert.equal(
+        calendar(2, 30),
+        `DOM SEG TER QUA QUI SEX SAB
+         01  02  03  04  05
+ 06  07  08  09  10  11  12
+ 13  14  15  16  17  18  19
+ 20  21  22  23  24  25  26
+ 27  28  29  30`
+      );
+    });
+
+    it('making month starting on Wednesday and ending on the 29st', () => {
+      assert.equal(
+        calendar(3, 29),
+        `DOM SEG TER QUA QUI SEX SAB
+             01  02  03  04
+ 05  06  07  08  09  10  11
+ 12  13  14  15  16  17  18
+ 19  20  21  22  23  24  25
+ 26  27  28  29`
+      );
+    });
+
+    it('making month starting on Saturday and ending on the 31st', () => {
+      assert.equal(
+        calendar(6, 31),
+        `DOM SEG TER QUA QUI SEX SAB
+                         01
+ 02  03  04  05  06  07  08
+ 09  10  11  12  13  14  15
+ 16  17  18  19  20  21  22
+ 23  24  25  26  27  28  29
+ 30  31`
+      );
+    });
+  });
+});
diff --git a/src/pages/exercises/function-calendar/_codes/js/response/package.json b/src/pages/exercises/function-calendar/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-calendar/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-factorial/_codes/js/code/factorial.test.js b/src/pages/exercises/function-factorial/_codes/js/code/factorial.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-factorial/_codes/js/code/factorial.test.js
rename to src/pages/exercises/function-factorial/_codes/js/code/factorial.jest.test.js
diff --git a/src/pages/exercises/function-factorial/_codes/js/code/factorial.js b/src/pages/exercises/function-factorial/_codes/js/code/factorial.js
index 67a4f21a..d7d50849 100644
--- a/src/pages/exercises/function-factorial/_codes/js/code/factorial.js
+++ b/src/pages/exercises/function-factorial/_codes/js/code/factorial.js
@@ -1,5 +1,3 @@
-function factorial(number) {
+export function factorial(number) {
   // TODO
 }
-
-export { factorial };
diff --git a/src/pages/exercises/function-factorial/_codes/js/code/factorial.node.test.js b/src/pages/exercises/function-factorial/_codes/js/code/factorial.node.test.js
new file mode 100644
index 00000000..c41d1329
--- /dev/null
+++ b/src/pages/exercises/function-factorial/_codes/js/code/factorial.node.test.js
@@ -0,0 +1,17 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { factorial } from './factorial.js';
+
+describe('Number Tools', () => {
+  describe('factorial()', () => {
+    it('should calculate factorial of a number', () => {
+      assert.equal(factorial(1), 1);
+
+      assert.equal(factorial(2), 2);
+
+      assert.equal(factorial(3), 6);
+
+      assert.equal(factorial(4), 24);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-factorial/_codes/js/code/package.json b/src/pages/exercises/function-factorial/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-factorial/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-factorial/_codes/js/response/factorial.test.js b/src/pages/exercises/function-factorial/_codes/js/response/factorial.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-factorial/_codes/js/response/factorial.test.js
rename to src/pages/exercises/function-factorial/_codes/js/response/factorial.jest.test.js
diff --git a/src/pages/exercises/function-factorial/_codes/js/response/factorial.js b/src/pages/exercises/function-factorial/_codes/js/response/factorial.js
index b9b68647..87f61408 100644
--- a/src/pages/exercises/function-factorial/_codes/js/response/factorial.js
+++ b/src/pages/exercises/function-factorial/_codes/js/response/factorial.js
@@ -1,12 +1,10 @@
-function factorial(number) {
+export function factorial(number) {
   if (number) return number * factorial(number - 1);
   else return 1;
 }
 
 /* alternative. to understand how ternary operators works:
  * https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Operators/Operador_Condicional */
-function factorialWithTernary(number) {
+export function factorialWithTernary(number) {
   return number ? number * factorial(number - 1) : 1;
 }
-
-export { factorial, factorialWithTernary };
diff --git a/src/pages/exercises/function-factorial/_codes/js/response/factorial.node.test.js b/src/pages/exercises/function-factorial/_codes/js/response/factorial.node.test.js
new file mode 100644
index 00000000..c41d1329
--- /dev/null
+++ b/src/pages/exercises/function-factorial/_codes/js/response/factorial.node.test.js
@@ -0,0 +1,17 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { factorial } from './factorial.js';
+
+describe('Number Tools', () => {
+  describe('factorial()', () => {
+    it('should calculate factorial of a number', () => {
+      assert.equal(factorial(1), 1);
+
+      assert.equal(factorial(2), 2);
+
+      assert.equal(factorial(3), 6);
+
+      assert.equal(factorial(4), 24);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-factorial/_codes/js/response/package.json b/src/pages/exercises/function-factorial/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-factorial/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.test.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.test.js
rename to src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.jest.test.js
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.js
index 6c539fa6..e6a80906 100644
--- a/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.js
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.js
@@ -1,5 +1,3 @@
-function fibonacci(number) {
+export function fibonacci(number) {
   // TODO
 }
-
-export { fibonacci };
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.node.test.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.node.test.js
new file mode 100644
index 00000000..8812971a
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/fibonacci-number.node.test.js
@@ -0,0 +1,19 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { fibonacci } from './fibonacci-number.js';
+
+describe('Fibonacci series', () => {
+  describe('fibonacci()', () => {
+    it('should calculate the nth fibonacci number', () => {
+      assert.equal(fibonacci(0), NaN);
+
+      assert.equal(fibonacci(1), 0);
+
+      assert.equal(fibonacci(2), 1);
+
+      assert.equal(fibonacci(4), 2);
+
+      assert.equal(fibonacci(6), 5);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/code/package.json b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.test.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.test.js
rename to src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.jest.test.js
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.js
index 93492145..1f9a8b41 100644
--- a/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.js
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.js
@@ -1,4 +1,4 @@
-function fibonacci(number) {
+export function fibonacci(number) {
   let a = 0;
   let b = 1;
   let temp = 1;
@@ -12,9 +12,7 @@ function fibonacci(number) {
       number--;
     }
   else if (number == 1) return 0;
-  else return undefined;
+  else return NaN;
 
   return temp;
 }
-
-export { fibonacci };
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.node.test.js b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.node.test.js
new file mode 100644
index 00000000..8812971a
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/fibonacci-number.node.test.js
@@ -0,0 +1,19 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { fibonacci } from './fibonacci-number.js';
+
+describe('Fibonacci series', () => {
+  describe('fibonacci()', () => {
+    it('should calculate the nth fibonacci number', () => {
+      assert.equal(fibonacci(0), NaN);
+
+      assert.equal(fibonacci(1), 0);
+
+      assert.equal(fibonacci(2), 1);
+
+      assert.equal(fibonacci(4), 2);
+
+      assert.equal(fibonacci(6), 5);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-fibonacci-nth/_codes/js/response/package.json b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-nth/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.test.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.test.js
rename to src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.jest.test.js
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.js
index 6c539fa6..e6a80906 100644
--- a/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.js
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.js
@@ -1,5 +1,3 @@
-function fibonacci(number) {
+export function fibonacci(number) {
   // TODO
 }
-
-export { fibonacci };
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.node.test.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.node.test.js
new file mode 100644
index 00000000..af11ced8
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/fibonacci-sequence.node.test.js
@@ -0,0 +1,19 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { fibonacci } from './fibonacci-sequence.js';
+
+describe('Fibonacci series', () => {
+  describe('fibonacci()', () => {
+    it('should return the first n fibonacci numbers', () => {
+      assert.equal(fibonacci(0), '');
+
+      assert.equal(fibonacci(1), '0');
+
+      assert.equal(fibonacci(2), '0, 1');
+
+      assert.equal(fibonacci(4), '0, 1, 1, 2');
+
+      assert.equal(fibonacci(6), '0, 1, 1, 2, 3, 5');
+    });
+  });
+});
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/package.json b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.test.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.test.js
rename to src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.jest.test.js
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.js
index f837e1fe..dd93ffe8 100644
--- a/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.js
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.js
@@ -1,4 +1,4 @@
-function fibonacci(number) {
+export function fibonacci(number) {
   let a = 0;
   let b = 1;
   let result = `${a}, ${b}`;
@@ -18,5 +18,3 @@ function fibonacci(number) {
 
   return result;
 }
-
-export { fibonacci };
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.node.test.js b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.node.test.js
new file mode 100644
index 00000000..af11ced8
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/fibonacci-sequence.node.test.js
@@ -0,0 +1,19 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { fibonacci } from './fibonacci-sequence.js';
+
+describe('Fibonacci series', () => {
+  describe('fibonacci()', () => {
+    it('should return the first n fibonacci numbers', () => {
+      assert.equal(fibonacci(0), '');
+
+      assert.equal(fibonacci(1), '0');
+
+      assert.equal(fibonacci(2), '0, 1');
+
+      assert.equal(fibonacci(4), '0, 1, 1, 2');
+
+      assert.equal(fibonacci(6), '0, 1, 1, 2, 3, 5');
+    });
+  });
+});
diff --git a/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/package.json b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-fibonacci-sequence/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.test.js b/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-figure-text/_codes/js/code/figure-text.test.js
rename to src/pages/exercises/function-figure-text/_codes/js/code/figure-text.jest.test.js
diff --git a/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.js b/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.js
index e51eab4a..6517cdd4 100644
--- a/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.js
+++ b/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.js
@@ -1,21 +1,19 @@
-function halfSquare(size) {
+export function halfSquare(size) {
   // TODO
 }
 
-function triangleText(size) {
+export function triangleText(size) {
   // TODO
 }
 
-function halfDiamondText(size) {
+export function halfDiamondText(size) {
   // TODO
 }
 
-function diamondText(size) {
+export function diamondText(size) {
   // TODO
 }
 
-function boardText(size) {
+export function boardText(size) {
   // TODO
 }
-
-export { triangleText, halfDiamondText, diamondText, boardText };
diff --git a/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.node.test.js b/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.node.test.js
new file mode 100644
index 00000000..ac5461ba
--- /dev/null
+++ b/src/pages/exercises/function-figure-text/_codes/js/code/figure-text.node.test.js
@@ -0,0 +1,75 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import {
+  triangleText,
+  halfDiamondText,
+  diamondText,
+  boardText,
+} from './figure-text.js';
+
+describe('Figure Text Tool', () => {
+  describe('triangleText()', () => {
+    it('making triangle text with size 1', () => {
+      assert.equal(triangleText(1), '#');
+    });
+
+    it('making triangle text with size 2', () => {
+      assert.equal(triangleText(2), '# \n' + '##');
+    });
+
+    it('making triangle text with size 3', () => {
+      assert.equal(triangleText(3), '#  \n' + '## \n' + '###');
+    });
+  });
+
+  describe('halfDiamondText()', () => {
+    it('making half diamond text with size 1', () => {
+      assert.equal(halfDiamondText(1), '#');
+    });
+
+    it('making half diamond text with size 2', () => {
+      assert.equal(halfDiamondText(2), '# \n' + '##\n' + '# ');
+    });
+
+    it('making half diamond text with size 3', () => {
+      assert.equal(
+        halfDiamondText(3),
+        '#  \n' + '## \n' + '###\n' + '## \n' + '#  '
+      );
+    });
+  });
+  describe('diamondText()', () => {
+    it('making diamond text with size 1', () => {
+      assert.equal(diamondText(1), '#');
+    });
+
+    it('making diamond text with size 2', () => {
+      assert.equal(diamondText(2), ' # \n' + '###\n' + ' # ');
+    });
+
+    it('making diamond text with size 3', () => {
+      assert.equal(
+        diamondText(3),
+        '  #  \n' + ' ### \n' + '#####\n' + ' ### \n' + '  #  '
+      );
+    });
+  });
+
+  describe('boardText()', () => {
+    it('making board text with size 1', () => {
+      assert.equal(boardText(1), '#');
+    });
+
+    it('making board text with size 2', () => {
+      assert.equal(boardText(2), '# \n' + ' #');
+    });
+
+    it('making board text with size 3', () => {
+      assert.equal(boardText(3), '# #\n' + ' # \n' + '# #');
+    });
+
+    it('making board text with size 4', () => {
+      assert.equal(boardText(4), '# # \n' + ' # #\n' + '# # \n' + ' # #');
+    });
+  });
+});
diff --git a/src/pages/exercises/function-figure-text/_codes/js/code/package.json b/src/pages/exercises/function-figure-text/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-figure-text/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.test.js b/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-figure-text/_codes/js/response/figure-text.test.js
rename to src/pages/exercises/function-figure-text/_codes/js/response/figure-text.jest.test.js
diff --git a/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.js b/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.js
index 5e308754..7a6fa2f6 100644
--- a/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.js
+++ b/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.js
@@ -1,4 +1,4 @@
-function halfSquare(size) {
+export function halfSquare(size) {
   let result = '';
   let block = '#';
   for (let row = 1; row <= size; row++) {
@@ -13,7 +13,7 @@ function halfSquare(size) {
   return result;
 }
 
-function triangleText(size) {
+export function triangleText(size) {
   let result = '';
   let block = '#';
   for (let row = 1; row <= size; row++) {
@@ -25,7 +25,7 @@ function triangleText(size) {
   return result;
 }
 
-function halfDiamondText(size) {
+export function halfDiamondText(size) {
   let result = '';
   let block = '#';
   for (let row = 1; row <= 2 * size - 1; row++) {
@@ -37,7 +37,7 @@ function halfDiamondText(size) {
   return result;
 }
 
-function diamondText(size) {
+export function diamondText(size) {
   let result = '';
   let block = '#';
   for (let row = 1; row <= 2 * size - 1; row++) {
@@ -54,7 +54,7 @@ function diamondText(size) {
   return result;
 }
 
-function boardText(size) {
+export function boardText(size) {
   let result = '';
   let block = '#';
   for (let row = 1; row <= size; row++) {
@@ -66,4 +66,3 @@ function boardText(size) {
   return result;
 }
 
-export { triangleText, halfDiamondText, diamondText, boardText };
diff --git a/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.node.test.js b/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.node.test.js
new file mode 100644
index 00000000..ac5461ba
--- /dev/null
+++ b/src/pages/exercises/function-figure-text/_codes/js/response/figure-text.node.test.js
@@ -0,0 +1,75 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import {
+  triangleText,
+  halfDiamondText,
+  diamondText,
+  boardText,
+} from './figure-text.js';
+
+describe('Figure Text Tool', () => {
+  describe('triangleText()', () => {
+    it('making triangle text with size 1', () => {
+      assert.equal(triangleText(1), '#');
+    });
+
+    it('making triangle text with size 2', () => {
+      assert.equal(triangleText(2), '# \n' + '##');
+    });
+
+    it('making triangle text with size 3', () => {
+      assert.equal(triangleText(3), '#  \n' + '## \n' + '###');
+    });
+  });
+
+  describe('halfDiamondText()', () => {
+    it('making half diamond text with size 1', () => {
+      assert.equal(halfDiamondText(1), '#');
+    });
+
+    it('making half diamond text with size 2', () => {
+      assert.equal(halfDiamondText(2), '# \n' + '##\n' + '# ');
+    });
+
+    it('making half diamond text with size 3', () => {
+      assert.equal(
+        halfDiamondText(3),
+        '#  \n' + '## \n' + '###\n' + '## \n' + '#  '
+      );
+    });
+  });
+  describe('diamondText()', () => {
+    it('making diamond text with size 1', () => {
+      assert.equal(diamondText(1), '#');
+    });
+
+    it('making diamond text with size 2', () => {
+      assert.equal(diamondText(2), ' # \n' + '###\n' + ' # ');
+    });
+
+    it('making diamond text with size 3', () => {
+      assert.equal(
+        diamondText(3),
+        '  #  \n' + ' ### \n' + '#####\n' + ' ### \n' + '  #  '
+      );
+    });
+  });
+
+  describe('boardText()', () => {
+    it('making board text with size 1', () => {
+      assert.equal(boardText(1), '#');
+    });
+
+    it('making board text with size 2', () => {
+      assert.equal(boardText(2), '# \n' + ' #');
+    });
+
+    it('making board text with size 3', () => {
+      assert.equal(boardText(3), '# #\n' + ' # \n' + '# #');
+    });
+
+    it('making board text with size 4', () => {
+      assert.equal(boardText(4), '# # \n' + ' # #\n' + '# # \n' + ' # #');
+    });
+  });
+});
diff --git a/src/pages/exercises/function-figure-text/_codes/js/response/package.json b/src/pages/exercises/function-figure-text/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-figure-text/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/code/package.json b/src/pages/exercises/function-prime-nth/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-prime-nth/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.test.js b/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.test.js
rename to src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.jest.test.js
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.js b/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.js
index 1014fb81..fa748828 100644
--- a/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.js
+++ b/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.js
@@ -4,8 +4,6 @@ import { isPrime } from '../../prime/code/prime.js';
  * begin: 1..n
  * end: 1..n, end > begin
  */
-function nthPrime(nth) {
+export function nthPrime(nth) {
   // TODO
 }
-
-export { nthPrime };
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.node.test.js b/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.node.test.js
new file mode 100644
index 00000000..1aef8554
--- /dev/null
+++ b/src/pages/exercises/function-prime-nth/_codes/js/code/prime-nth.node.test.js
@@ -0,0 +1,13 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { nthPrime } from './prime-nth.js';
+
+describe('Number Tools', () => {
+  describe('nthPrime()', () => {
+    it('should return the nth prime number', () => {
+      assert.equal(nthPrime(4), 7);
+
+      assert.equal(nthPrime(6), 13);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/response/package.json b/src/pages/exercises/function-prime-nth/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-prime-nth/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.test.js b/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.test.js
rename to src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.jest.test.js
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.js b/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.js
index ff2a5218..d8890f74 100644
--- a/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.js
+++ b/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.js
@@ -1,10 +1,10 @@
-import { isPrime } from '../../prime/response/prime.js';
+import { isPrime } from '../../../../function-prime/_codes/js/response/prime.js';
 
 /**
  * begin: 1..n
  * end: 1..n, end > begin
  */
-function nthPrime(nth) {
+export function nthPrime(nth) {
   let result = 2;
 
   for (let number = 3, count = 1; count < nth; number++) {
@@ -16,5 +16,3 @@ function nthPrime(nth) {
 
   return result;
 }
-
-export { nthPrime };
diff --git a/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.node.test.js b/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.node.test.js
new file mode 100644
index 00000000..1aef8554
--- /dev/null
+++ b/src/pages/exercises/function-prime-nth/_codes/js/response/prime-nth.node.test.js
@@ -0,0 +1,13 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { nthPrime } from './prime-nth.js';
+
+describe('Number Tools', () => {
+  describe('nthPrime()', () => {
+    it('should return the nth prime number', () => {
+      assert.equal(nthPrime(4), 7);
+
+      assert.equal(nthPrime(6), 13);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-prime/_codes/js/code/package.json b/src/pages/exercises/function-prime/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-prime/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-prime/_codes/js/code/prime.test.js b/src/pages/exercises/function-prime/_codes/js/code/prime.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-prime/_codes/js/code/prime.test.js
rename to src/pages/exercises/function-prime/_codes/js/code/prime.jest.test.js
diff --git a/src/pages/exercises/function-prime/_codes/js/code/prime.js b/src/pages/exercises/function-prime/_codes/js/code/prime.js
index 6aeb1aef..7564d1f3 100644
--- a/src/pages/exercises/function-prime/_codes/js/code/prime.js
+++ b/src/pages/exercises/function-prime/_codes/js/code/prime.js
@@ -1,5 +1,3 @@
-function isPrime(number) {
+export function isPrime(number) {
   // TODO
 }
-
-export { isPrime };
diff --git a/src/pages/exercises/function-prime/_codes/js/code/prime.node.test.js b/src/pages/exercises/function-prime/_codes/js/code/prime.node.test.js
new file mode 100644
index 00000000..ef5025ce
--- /dev/null
+++ b/src/pages/exercises/function-prime/_codes/js/code/prime.node.test.js
@@ -0,0 +1,21 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { isPrime } from './prime.js';
+
+describe('Number Tools', () => {
+  describe('isPrime()', () => {
+    it('should check if a number is prime', () => {
+      assert.equal(isPrime(2), true);
+
+      assert.equal(isPrime(3), true);
+
+      assert.equal(isPrime(4), false);
+
+      assert.equal(isPrime(5), true);
+
+      assert.equal(isPrime(6), false);
+
+      assert.equal(isPrime(7), true);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-prime/_codes/js/response/package.json b/src/pages/exercises/function-prime/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-prime/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-prime/_codes/js/response/prime.test.js b/src/pages/exercises/function-prime/_codes/js/response/prime.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-prime/_codes/js/response/prime.test.js
rename to src/pages/exercises/function-prime/_codes/js/response/prime.jest.test.js
diff --git a/src/pages/exercises/function-prime/_codes/js/response/prime.js b/src/pages/exercises/function-prime/_codes/js/response/prime.js
index 0f430a58..ec7b65df 100644
--- a/src/pages/exercises/function-prime/_codes/js/response/prime.js
+++ b/src/pages/exercises/function-prime/_codes/js/response/prime.js
@@ -1,7 +1,6 @@
-function isPrime(number) {
+export function isPrime(number) {
   // for(let i = 2; i < number; i++)
-  for (let i = 2, s = Math.sqrt(number); i <= s; i++) if (number % i === 0) return false;
+  for (let i = 2, s = Math.sqrt(number); i <= s; i++)
+    if (number % i === 0) return false;
   return number !== 1;
 }
-
-export { isPrime };
diff --git a/src/pages/exercises/function-prime/_codes/js/response/prime.node.test.js b/src/pages/exercises/function-prime/_codes/js/response/prime.node.test.js
new file mode 100644
index 00000000..ef5025ce
--- /dev/null
+++ b/src/pages/exercises/function-prime/_codes/js/response/prime.node.test.js
@@ -0,0 +1,21 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { isPrime } from './prime.js';
+
+describe('Number Tools', () => {
+  describe('isPrime()', () => {
+    it('should check if a number is prime', () => {
+      assert.equal(isPrime(2), true);
+
+      assert.equal(isPrime(3), true);
+
+      assert.equal(isPrime(4), false);
+
+      assert.equal(isPrime(5), true);
+
+      assert.equal(isPrime(6), false);
+
+      assert.equal(isPrime(7), true);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-sum/_codes/js/code/package.json b/src/pages/exercises/function-sum/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-sum/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-sum/_codes/js/code/sum.test.js b/src/pages/exercises/function-sum/_codes/js/code/sum.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-sum/_codes/js/code/sum.test.js
rename to src/pages/exercises/function-sum/_codes/js/code/sum.jest.test.js
diff --git a/src/pages/exercises/function-sum/_codes/js/code/sum.js b/src/pages/exercises/function-sum/_codes/js/code/sum.js
index 424c64dc..077cf99a 100644
--- a/src/pages/exercises/function-sum/_codes/js/code/sum.js
+++ b/src/pages/exercises/function-sum/_codes/js/code/sum.js
@@ -1,5 +1,3 @@
-function sum(a, b) {
+export function sum(a, b) {
   // TODO
 }
-
-export { sum };
diff --git a/src/pages/exercises/function-sum/_codes/js/code/sum.node.test.js b/src/pages/exercises/function-sum/_codes/js/code/sum.node.test.js
new file mode 100644
index 00000000..d79e401d
--- /dev/null
+++ b/src/pages/exercises/function-sum/_codes/js/code/sum.node.test.js
@@ -0,0 +1,13 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { sum } from './sum.js';
+
+describe('Number Tools', () => {
+  describe('sum()', () => {
+    it('should add values', () => {
+      assert.equal(sum(1, 2), 3);
+
+      assert.equal(sum(3, 2), 5);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-sum/_codes/js/response/package.json b/src/pages/exercises/function-sum/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-sum/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-sum/_codes/js/response/sum.test.js b/src/pages/exercises/function-sum/_codes/js/response/sum.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-sum/_codes/js/response/sum.test.js
rename to src/pages/exercises/function-sum/_codes/js/response/sum.jest.test.js
diff --git a/src/pages/exercises/function-sum/_codes/js/response/sum.js b/src/pages/exercises/function-sum/_codes/js/response/sum.js
index e51581ac..506a4134 100644
--- a/src/pages/exercises/function-sum/_codes/js/response/sum.js
+++ b/src/pages/exercises/function-sum/_codes/js/response/sum.js
@@ -1,5 +1,3 @@
-function sum(a, b) {
+export function sum(a, b) {
   return a + b;
 }
-
-export { sum };
diff --git a/src/pages/exercises/function-sum/_codes/js/response/sum.node.test.js b/src/pages/exercises/function-sum/_codes/js/response/sum.node.test.js
new file mode 100644
index 00000000..d79e401d
--- /dev/null
+++ b/src/pages/exercises/function-sum/_codes/js/response/sum.node.test.js
@@ -0,0 +1,13 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { sum } from './sum.js';
+
+describe('Number Tools', () => {
+  describe('sum()', () => {
+    it('should add values', () => {
+      assert.equal(sum(1, 2), 3);
+
+      assert.equal(sum(3, 2), 5);
+    });
+  });
+});
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/code/package.json b/src/pages/exercises/function-triangle-checker/_codes/js/code/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/code/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.test.js b/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.test.js
rename to src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.jest.test.js
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.js b/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.js
index 1aff5f9a..3e95dd56 100644
--- a/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.js
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.js
@@ -1,5 +1,3 @@
-function triangleChecker(a, b, c) {
+export function triangleChecker(a, b, c) {
   // TODO
 }
-
-export { triangleChecker };
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.node.test.js b/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.node.test.js
new file mode 100644
index 00000000..1dd88ace
--- /dev/null
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/code/triangle-checker.node.test.js
@@ -0,0 +1,32 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { triangleChecker } from './triangle-checker.js';
+
+describe('Triangle Tools', () => {
+  describe('triangleChecker()', () => {
+    it('should return equilateral', () => {
+      assert.equal(triangleChecker(2, 2, 2), 'equilateral');
+      assert.equal(triangleChecker(10, 10, 10), 'equilateral');
+    });
+
+    it('should return isosceles', () => {
+      assert.equal(triangleChecker(3, 4, 4), 'isosceles');
+      assert.equal(triangleChecker(4, 3, 4), 'isosceles');
+      assert.equal(triangleChecker(4, 4, 3), 'isosceles');
+      assert.equal(triangleChecker(10, 10, 2), 'isosceles');
+    });
+
+    it('should return scalene', () => {
+      assert.equal(triangleChecker(3, 4, 5), 'scalene');
+      assert.equal(triangleChecker(10, 11, 12), 'scalene');
+      assert.equal(triangleChecker(5, 4, 2), 'scalene');
+    });
+
+    it('should check if it is invalid', () => {
+      assert.equal(triangleChecker(0, 0, 0), 'none');
+      assert.equal(triangleChecker(3, 4, -5), 'none');
+      assert.equal(triangleChecker(1, 1, 3), 'none');
+      assert.equal(triangleChecker(2, 4, 2), 'none');
+    });
+  });
+});
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/response/package.json b/src/pages/exercises/function-triangle-checker/_codes/js/response/package.json
new file mode 100644
index 00000000..3dbc1ca5
--- /dev/null
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/response/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.test.js b/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.jest.test.js
similarity index 100%
rename from src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.test.js
rename to src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.jest.test.js
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.js b/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.js
index 5e4dc394..498d8db2 100644
--- a/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.js
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.js
@@ -1,4 +1,4 @@
-function triangleChecker(a, b, c) {
+export function triangleChecker(a, b, c) {
   if (a >= b + c || b >= a + c || c >= a + b) return 'none';
   else
     switch (true) {
@@ -10,5 +10,3 @@ function triangleChecker(a, b, c) {
         return 'isosceles';
     }
 }
-
-export { triangleChecker };
diff --git a/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.node.test.js b/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.node.test.js
new file mode 100644
index 00000000..1dd88ace
--- /dev/null
+++ b/src/pages/exercises/function-triangle-checker/_codes/js/response/triangle-checker.node.test.js
@@ -0,0 +1,32 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import { triangleChecker } from './triangle-checker.js';
+
+describe('Triangle Tools', () => {
+  describe('triangleChecker()', () => {
+    it('should return equilateral', () => {
+      assert.equal(triangleChecker(2, 2, 2), 'equilateral');
+      assert.equal(triangleChecker(10, 10, 10), 'equilateral');
+    });
+
+    it('should return isosceles', () => {
+      assert.equal(triangleChecker(3, 4, 4), 'isosceles');
+      assert.equal(triangleChecker(4, 3, 4), 'isosceles');
+      assert.equal(triangleChecker(4, 4, 3), 'isosceles');
+      assert.equal(triangleChecker(10, 10, 2), 'isosceles');
+    });
+
+    it('should return scalene', () => {
+      assert.equal(triangleChecker(3, 4, 5), 'scalene');
+      assert.equal(triangleChecker(10, 11, 12), 'scalene');
+      assert.equal(triangleChecker(5, 4, 2), 'scalene');
+    });
+
+    it('should check if it is invalid', () => {
+      assert.equal(triangleChecker(0, 0, 0), 'none');
+      assert.equal(triangleChecker(3, 4, -5), 'none');
+      assert.equal(triangleChecker(1, 1, 3), 'none');
+      assert.equal(triangleChecker(2, 4, 2), 'none');
+    });
+  });
+});