✨: Add Dafalgan implementation

src/model/drug/__snapshots__/dafalgan.test.ts.snap

@@ -0,0 +1,43 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Dafalgan should be serializable to JSON 1`] = `
+Object {
+  "benefit": 5,
+  "expiresIn": 30,
+  "name": "Dafalgan",
+}
+`;
+
+exports[`Dafalgan should be serializable to string 1`] = `"{\\"name\\":\\"Dafalgan\\",\\"expiresIn\\":30,\\"benefit\\":5}"`;
+
+exports[`Dafalgan should decrease benefit twice as much if expired 1`] = `
+Object {
+  "benefit": 1,
+  "expiresIn": -1,
+  "name": "Dafalgan",
+}
+`;
+
+exports[`Dafalgan should decrease expiresIn and benefit over time 1`] = `
+Object {
+  "benefit": 3,
+  "expiresIn": 29,
+  "name": "Dafalgan",
+}
+`;
+
+exports[`Dafalgan should not allow for a benefit greater than 50 1`] = `
+Object {
+  "benefit": 50,
+  "expiresIn": 30,
+  "name": "Dafalgan",
+}
+`;
+
+exports[`Dafalgan should not allow for a negative benefit 1`] = `
+Object {
+  "benefit": 0,
+  "expiresIn": 30,
+  "name": "Dafalgan",
+}
+`;

src/model/drug/dafalgan.test.ts

@@ -0,0 +1,44 @@
+import { Dafalgan } from './dafalgan';
+
+describe('Dafalgan', () => {
+  let dafalgan: Dafalgan;
+
+  beforeEach(() => {
+    dafalgan = new Dafalgan(30, 5);
+  });
+
+  it('should not allow for a negative benefit', () => {
+    dafalgan.benefit = -5;
+    expect(dafalgan).toMatchSnapshot();
+  });
+
+  it('should not allow for a benefit greater than 50', () => {
+    dafalgan.benefit = 51;
+    expect(dafalgan).toMatchSnapshot();
+  });
+
+  it('should return expiration status', () => {
+    expect(dafalgan.isExpired()).toBe(false);
+    dafalgan.expiresIn = 0;
+    expect(dafalgan.isExpired()).toBe(true);
+  });
+
+  it('should decrease expiresIn and benefit over time', () => {
+    dafalgan.updateValues();
+    expect(dafalgan).toMatchSnapshot();
+  });
+
+  it('should decrease benefit twice as much if expired', () => {
+    dafalgan.expiresIn = 0;
+    dafalgan.updateValues();
+    expect(dafalgan).toMatchSnapshot();
+  });
+
+  it('should be serializable to JSON', () => {
+    expect(dafalgan.toJSON()).toMatchSnapshot();
+  });
+
+  it('should be serializable to string', () => {
+    expect(dafalgan.toString()).toMatchSnapshot();
+  });
+});

src/model/drug/dafalgan.ts

@@ -0,0 +1,15 @@
+import { DrugName } from '../../type/DrugName';
+import { Drug } from './drug';
+
+export class Dafalgan extends Drug {
+  constructor(expiresIn: number, benefit: number) {
+    super(DrugName.DAFALGAN, expiresIn, benefit);
+  }
+
+  public updateValues(): this {
+    this.benefit -= this.isExpired() ? 4 : 2;
+    this.expiresIn -= 1;
+
+    return this;
+  }
+}

src/type/DrugName.ts

@@ -1,4 +1,5 @@
 export enum DrugName {
+  DAFALGAN = 'Dafalgan',
   DOLIPRANE = 'Doliprane',
   HERBAL_TEA = 'Herbal Tea',
   FERVEX = 'Fervex',