✅ Add vitest and initial tests

src/tools/shared/math/percentage.tool.test.ts

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+import { describe, expect, it } from 'vitest';
+
+import { percentage } from './percentage.tool';
+
+describe('percentage', () => {
+  it.concurrent('be fixed value', () => {
+    // arrange
+    const value = 62;
+
+    // act
+    const fixedPercentage = percentage(value, 100);
+
+    // assert
+    expect(fixedPercentage).toBe('62.0');
+  });
+
+  it.concurrent('be fixed value when decimal places', () => {
+    // arrange
+    const value = 42.69696969;
+
+    // act
+    const fixedPercentage = percentage(value, 100);
+
+    // assert
+    expect(fixedPercentage).toBe('42.7');
+  });
+});

src/tools/shared/math/percentage.tool.ts

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+export const percentage = (partialValue: number, totalValue: number) =>
+  ((100 * partialValue) / totalValue).toFixed(1);

src/tools/shared/time/date.tool.test.ts

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+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { isToday } from './date.tool';
+
+describe('isToday', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it.concurrent('should return true if date is today', () => {
+    // arrange
+    const date = new Date(2022, 3, 17);
+    vi.setSystemTime(date);
+
+    // act
+    const today = isToday(date);
+
+    // assert
+    expect(today).toBe(true);
+  });
+
+  it.concurrent("should return true if date is today and time doesn't match", () => {
+    // arrange
+    vi.setSystemTime(new Date(2022, 3, 17, 16, 25, 11));
+
+    // act
+    const today = isToday(new Date(2022, 3, 17));
+
+    // assert
+    expect(today).toBe(true);
+  });
+
+  it.concurrent("should be false if date doesn't match", () => {
+    // arrange
+    vi.setSystemTime(new Date(2022, 3, 17, 16));
+
+    // act
+    const today = isToday(new Date(2022, 3, 15));
+
+    // assert
+    expect(today).toBe(false);
+  });
+});

src/tools/shared/time/date.tool.ts

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+export const isToday = (date: Date) => {
+  const today = new Date();
+  return (
+    today.getDate() === date.getDate() &&
+    today.getMonth() === date.getMonth() &&
+    today.getFullYear() === date.getFullYear()
+  );
+};

src/tools/shared/time/stopwatch.tool.test.ts

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+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { Stopwatch } from './stopwatch.tool';
+
+describe('stopwatch', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it.concurrent('should be elapsed time between start and current', () => {
+    // arrange
+    vi.setSystemTime(new Date(2023, 2, 26, 0, 0, 0));
+    const stopwatch = new Stopwatch();
+
+    // act
+    vi.setSystemTime(new Date(2023, 2, 26, 0, 0, 2));
+    const milliseconds = stopwatch.getEllapsedMilliseconds();
+
+    // assert
+    expect(milliseconds).toBe(2000);
+  });
+});