Refacto and implementation for new drug

drugs/dafalgan.ts

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+import { Drug, DrugName } from "./drug";
+
+export class Dafalgan extends Drug {
+    constructor(expiresIn: number, benefit: number) {
+        super(DrugName.DAFALGAN, expiresIn, benefit);
+    }
+
+    public updateDrug(): void {
+        if (this.isExpired) {
+            this.decreaseBenefit(2);
+            return;
+        }
+        this.decreaseExpiresIn();
+        this.decreaseBenefit(2);
+    }
+}

drugs/doliprane.ts

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+import { Drug, DrugName } from "./drug";
+
+export class Doliprane extends Drug {
+    constructor(expiresIn: number, benefit: number) {
+        super(DrugName.DOLIPRANE, expiresIn, benefit);
+    }
+
+    public updateDrug(): void {
+        if (this.isExpired) {
+            this.resetBenefit();
+            return;
+        }
+       this.decreaseExpiresIn();
+       this.decreaseBenefit();
+    }
+}

drugs/drug.test.ts

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+import { Drug } from "./drug";
+import { Fervex } from "./fervex";
+import { HerbalTea } from "./herbalTea";
+import { MagicPill } from "./magicPill";
+import { Dafalgan } from "./dafalgan";
+import { Doliprane } from "./doliprane";
+
+describe("Drug", () => {
+    describe("MagicPill", () => {
+        it("expiresIn and benefit never change", () => {
+            const drug = new MagicPill(2, 3);
+            drug.updateDrug();
+            expect(drug.expiresIn).toEqual(2);
+            expect(drug.benefit).toEqual(3);
+        });
+    });
+
+    describe("Fervex", () => {
+        it("should increase benefit 2 times when expiresIn is less or equal 10", () => {
+            const drug = new Fervex(10, 3);
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(5);
+        })
+
+        it("should increase benefit 3 times when expiresIn is less or equal 5", () => {
+            const drug = new Fervex(5, 3);
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(6);
+        })
+
+        it("should decrease benefit to 0 when expireIn is 0", () => {
+            const drug = new Fervex(1, 3);
+            drug.updateDrug();
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(0);
+        })
+    });
+
+    describe("HerbalTea", () => {
+        it("should increase benefit and decrease expireIn", () => {
+            const drug = new HerbalTea(10, 3);
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(4);
+            expect(drug.expiresIn).toEqual(9);
+        })
+
+        it("should increase benefit 2 times when expireIn is 0", () => {
+            const drug = new HerbalTea(1, 3);
+
+            drug.updateDrug();
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(6);
+            expect(drug.expiresIn).toEqual(0);
+        })
+
+        it('benefit can not increase until 50', () => {
+            const drug = new HerbalTea(0, 50);
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(50);
+        });
+    });
+
+    describe("Doliprane", () => {
+        it("should decrease decrease expiresIn and benefit", () => {
+            const drug = new Doliprane(10, 3);
+            drug.updateDrug();
+
+            expect(drug.expiresIn).toEqual(9);
+            expect(drug.benefit).toEqual(2);
+        })
+    });
+
+    describe("Dafalgan", () => {
+        it("should decrease 2 time faster benefit", () => {
+            const drug = new Dafalgan(10, 3);
+            drug.updateDrug();
+
+            expect(drug.benefit).toEqual(1);
+        })
+    });
+
+});

drugs/drug.ts

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+export abstract class Drug {
+    readonly minBenefit: number = 0;
+    readonly maxBenefit: number = 50;
+
+    public name: string;
+    public expiresIn: number;
+    public benefit: number;
+    public isExpired: boolean = false;
+
+    constructor(name: string, expiresIn: number, benefit: number) {
+        this.name = name;
+        this.expiresIn = expiresIn;
+        this.benefit = benefit;
+    }
+
+    public decreaseExpiresIn(): void {
+        this.expiresIn--;
+        if (this.expiresIn <= 0) {
+            this.isExpired = true;
+        }
+    };
+
+   public decreaseBenefit(multiplicator: number = 1): void {
+        if (this.isExpired) {
+            this.benefit - multiplicator * 2 <= this.minBenefit ? this.benefit = this.minBenefit : this.benefit -= multiplicator * 2;
+        } else {
+            this.benefit - multiplicator <= this.minBenefit ? this.benefit = this.minBenefit : this.benefit -= multiplicator;
+        }
+    };
+
+    public incrementBenefit(multiplicator: number = 1): void {
+        this.benefit + multiplicator >= this.maxBenefit ? this.benefit = this.maxBenefit : this.benefit += multiplicator;
+    };
+
+    public resetBenefit(): void {
+        this.benefit = this.minBenefit;
+    }
+
+    abstract updateDrug(): void;
+}
+
+export const DrugName = {
+    DOLIPRANE: "Doliprane",
+    HERBAL_TEA: "Herbal Tea",
+    FERVEX: "Fervex",
+    MAGIC_PILL: "Magic Pill",
+    DAFALGAN: "Dafalgan"
+  };

drugs/fervex.ts

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+import { Drug, DrugName } from "./drug";
+
+export class Fervex extends Drug {
+    constructor(expiresIn: number, benefit: number) {
+        super(DrugName.FERVEX, expiresIn, benefit);
+    }
+
+    public updateDrug(): void {
+        if (this.isExpired) {
+            this.resetBenefit();
+            return;
+        }
+        if (this.expiresIn <= 5) {
+            this.decreaseExpiresIn();
+            this.incrementBenefit(3);
+            return;
+        }
+        if (this.expiresIn <= 10) {
+            this.decreaseExpiresIn();
+            this.incrementBenefit(2);
+            return;
+        }
+    }
+}

drugs/herbalTea.ts

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+import { Drug, DrugName } from "./drug";
+
+export class HerbalTea extends Drug {
+    constructor(expiresIn: number, benefit: number) {
+        super(DrugName.HERBAL_TEA, expiresIn, benefit);
+    }
+
+    public updateDrug(): void {
+        if (this.isExpired) {
+            this.incrementBenefit(2);
+            return;
+        }
+
+        this.decreaseExpiresIn();
+        this.incrementBenefit();
+    }
+}

drugs/magicPill.ts

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+import { Drug, DrugName } from "./drug";
+
+export class MagicPill extends Drug {
+    constructor(expiresIn: number, benefit: number) {
+        super(DrugName.MAGIC_PILL, expiresIn, benefit);
+    }
+
+    public updateDrug(): void {}
+}

golden-master.test.ts

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+import fs from 'fs';
+
+describe('Golden master test', () => {
+    it('should expect same result as the initial output', () => {
+
+        const initialResult = fs.readFileSync('initial-output.txt').toString();
+        const newResult = fs.readFileSync('output.txt').toString();
+
+        expect(newResult).toEqual(initialResult);
+    })
+});

index.ts

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+import fs from "fs";
+import { Dafalgan } from "./drugs/dafalgan";
+import { Doliprane } from "./drugs/doliprane";
+import { Drug } from "./drugs/drug";
+import { Fervex } from "./drugs/fervex";
+import { HerbalTea } from "./drugs/herbalTea";
+import { MagicPill } from "./drugs/magicPill";
+import { Pharmacy } from "./pharmacy";
+
+const drugs: Drug[] = [
+  new Doliprane(20, 30),
+  new HerbalTea(10, 5),
+  new Fervex(5, 40),
+  new MagicPill(15, 40),
+  new Dafalgan(10, 30)
+];
+
+const trial: Pharmacy = new Pharmacy(drugs);
+
+const log: string[] = [];
+
+const replacer = (key: string, value: string): any => {
+  if ('minBenefit' === key || 'maxBenefit' === key || 'isExpired' === key) {
+    return undefined;
+  }
+  return value;
+};
+
+for (let elapsedDays = 0; elapsedDays < 30; elapsedDays++) {
+  log.push(JSON.stringify(trial.updateBenefitValue(), replacer));
+}
+
+/* eslint-disable no-console */
+fs.writeFile("output.txt", log.toString(), err => {
+  if (err) {
+    console.log("error");
+  } else {
+    console.log("success");
+  }
+});
+/* eslint-enable no-console */

initial-output.txt

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+[{"name":"Doliprane","expiresIn":19,"benefit":29},{"name":"Herbal Tea","expiresIn":9,"benefit":6},{"name":"Fervex","expiresIn":4,"benefit":43},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":18,"benefit":28},{"name":"Herbal Tea","expiresIn":8,"benefit":7},{"name":"Fervex","expiresIn":3,"benefit":46},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":17,"benefit":27},{"name":"Herbal Tea","expiresIn":7,"benefit":8},{"name":"Fervex","expiresIn":2,"benefit":49},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":16,"benefit":26},{"name":"Herbal Tea","expiresIn":6,"benefit":9},{"name":"Fervex","expiresIn":1,"benefit":50},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":15,"benefit":25},{"name":"Herbal Tea","expiresIn":5,"benefit":10},{"name":"Fervex","expiresIn":0,"benefit":50},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":14,"benefit":24},{"name":"Herbal Tea","expiresIn":4,"benefit":11},{"name":"Fervex","expiresIn":-1,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":13,"benefit":23},{"name":"Herbal Tea","expiresIn":3,"benefit":12},{"name":"Fervex","expiresIn":-2,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":12,"benefit":22},{"name":"Herbal Tea","expiresIn":2,"benefit":13},{"name":"Fervex","expiresIn":-3,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":11,"benefit":21},{"name":"Herbal Tea","expiresIn":1,"benefit":14},{"name":"Fervex","expiresIn":-4,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":10,"benefit":20},{"name":"Herbal Tea","expiresIn":0,"benefit":15},{"name":"Fervex","expiresIn":-5,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":9,"benefit":19},{"name":"Herbal Tea","expiresIn":-1,"benefit":17},{"name":"Fervex","expiresIn":-6,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":8,"benefit":18},{"name":"Herbal Tea","expiresIn":-2,"benefit":19},{"name":"Fervex","expiresIn":-7,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":7,"benefit":17},{"name":"Herbal Tea","expiresIn":-3,"benefit":21},{"name":"Fervex","expiresIn":-8,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":6,"benefit":16},{"name":"Herbal Tea","expiresIn":-4,"benefit":23},{"name":"Fervex","expiresIn":-9,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":5,"benefit":15},{"name":"Herbal Tea","expiresIn":-5,"benefit":25},{"name":"Fervex","expiresIn":-10,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":4,"benefit":14},{"name":"Herbal Tea","expiresIn":-6,"benefit":27},{"name":"Fervex","expiresIn":-11,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":3,"benefit":13},{"name":"Herbal Tea","expiresIn":-7,"benefit":29},{"name":"Fervex","expiresIn":-12,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":2,"benefit":12},{"name":"Herbal Tea","expiresIn":-8,"benefit":31},{"name":"Fervex","expiresIn":-13,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":1,"benefit":11},{"name":"Herbal Tea","expiresIn":-9,"benefit":33},{"name":"Fervex","expiresIn":-14,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":0,"benefit":10},{"name":"Herbal Tea","expiresIn":-10,"benefit":35},{"name":"Fervex","expiresIn":-15,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-1,"benefit":8},{"name":"Herbal Tea","expiresIn":-11,"benefit":37},{"name":"Fervex","expiresIn":-16,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-2,"benefit":6},{"name":"Herbal Tea","expiresIn":-12,"benefit":39},{"name":"Fervex","expiresIn":-17,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-3,"benefit":4},{"name":"Herbal Tea","expiresIn":-13,"benefit":41},{"name":"Fervex","expiresIn":-18,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-4,"benefit":2},{"name":"Herbal Tea","expiresIn":-14,"benefit":43},{"name":"Fervex","expiresIn":-19,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-5,"benefit":0},{"name":"Herbal Tea","expiresIn":-15,"benefit":45},{"name":"Fervex","expiresIn":-20,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-6,"benefit":0},{"name":"Herbal Tea","expiresIn":-16,"benefit":47},{"name":"Fervex","expiresIn":-21,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-7,"benefit":0},{"name":"Herbal Tea","expiresIn":-17,"benefit":49},{"name":"Fervex","expiresIn":-22,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-8,"benefit":0},{"name":"Herbal Tea","expiresIn":-18,"benefit":50},{"name":"Fervex","expiresIn":-23,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-9,"benefit":0},{"name":"Herbal Tea","expiresIn":-19,"benefit":50},{"name":"Fervex","expiresIn":-24,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}],[{"name":"Doliprane","expiresIn":-10,"benefit":0},{"name":"Herbal Tea","expiresIn":-20,"benefit":50},{"name":"Fervex","expiresIn":-25,"benefit":0},{"name":"Magic Pill","expiresIn":15,"benefit":40}]