diff --git a/packages/falso/src/tests/core/date-is-unique.spec.ts b/packages/falso/src/tests/core/date-is-unique.spec.ts
new file mode 100644
index 000000000..030c30f53
--- /dev/null
+++ b/packages/falso/src/tests/core/date-is-unique.spec.ts
@@ -0,0 +1,32 @@
+import { dateIsUnique } from '../../lib/core/unique-validators';
+import { randPastDate } from '@ngneat/falso';
+
+describe('dateIsUnique', () => {
+  let dates: Date[];
+  let date1: Date;
+  let date2: Date;
+  let date3: Date;
+
+  beforeEach(() => {
+    date1 = randPastDate();
+    date2 = randPastDate();
+    date3 = randPastDate();
+    dates = [date1, date2];
+  });
+
+  describe('date is unique', () => {
+    it('should return true', () => {
+      const result = dateIsUnique(date3, dates);
+
+      expect(result).toEqual(true);
+    });
+  });
+
+  describe('date is not unique', () => {
+    it('should return false', () => {
+      const result = dateIsUnique(date2, dates);
+
+      expect(result).toEqual(false);
+    });
+  });
+});
diff --git a/packages/falso/src/tests/core/object-with-id-is-unique.spec.ts b/packages/falso/src/tests/core/object-with-id-is-unique.spec.ts
new file mode 100644
index 000000000..3f23c4652
--- /dev/null
+++ b/packages/falso/src/tests/core/object-with-id-is-unique.spec.ts
@@ -0,0 +1,46 @@
+import { objectWithIdIsUnique } from '../../lib/core/unique-validators';
+import { randFullName, randNumber } from '@ngneat/falso';
+
+describe('objectWithIdIsUnique', () => {
+  let objects: any[];
+  let object1: any;
+  let object2: any;
+  let object3: any;
+
+  beforeEach(() => {
+    const name = randFullName();
+    const age = randNumber({ min: 10, max: 90 });
+    object1 = {
+      id: '1',
+      name,
+      age,
+    };
+    object2 = {
+      id: '2',
+      name,
+      age,
+    };
+    object3 = {
+      id: '3',
+      name,
+      age,
+    };
+    objects = [object1, object2];
+  });
+
+  describe('object id is unique', () => {
+    it('should return true', () => {
+      const result = objectWithIdIsUnique(object3, objects);
+
+      expect(result).toEqual(true);
+    });
+  });
+
+  describe('object id is not unique', () => {
+    it('should return false', () => {
+      const result = objectWithIdIsUnique(object2, objects);
+
+      expect(result).toEqual(false);
+    });
+  });
+});
diff --git a/packages/falso/src/tests/core/primitive-value-is-unique.spec.ts b/packages/falso/src/tests/core/primitive-value-is-unique.spec.ts
new file mode 100644
index 000000000..abfbd08d2
--- /dev/null
+++ b/packages/falso/src/tests/core/primitive-value-is-unique.spec.ts
@@ -0,0 +1,32 @@
+import { primitiveValueIsUnique } from '../../lib/core/unique-validators';
+import { randNumber } from '@ngneat/falso';
+
+describe('primitiveValueIsUnique', () => {
+  let items: number[];
+  let item1: number;
+  let item2: number;
+  let item3: number;
+
+  beforeEach(() => {
+    item1 = randNumber();
+    item2 = randNumber();
+    item3 = randNumber();
+    items = [item1, item2];
+  });
+
+  describe('item is unique', () => {
+    it('should return true', () => {
+      const result = primitiveValueIsUnique(item3, items);
+
+      expect(result).toEqual(true);
+    });
+  });
+
+  describe('item is not unique', () => {
+    it('should return false', () => {
+      const result = primitiveValueIsUnique(item2, items);
+
+      expect(result).toEqual(false);
+    });
+  });
+});