✨ add an algorithm for checking a year is a leap year or not

Maths/test/LeapYear.test.js

@@ -0,0 +1,22 @@
+import { isLeapYear } from '../LeapYear'
+
+describe('Leap Year', () => {
+  it('Should return true on the year 2000', () => {
+    expect(isLeapYear(2000)).toBe(true)
+  })
+  it('Should return false on the year 2001', () => {
+    expect(isLeapYear(2001)).toBe(false)
+  })
+  it('Should return false on the year 2002', () => {
+    expect(isLeapYear(2002)).toBe(false)
+  })
+  it('Should return false on the year 2003', () => {
+    expect(isLeapYear(2003)).toBe(false)
+  })
+  it('Should return false on the year 2004', () => {
+    expect(isLeapYear(2004)).toBe(true)
+  })
+  it('Should return false on the year 1900', () => {
+    expect(isLeapYear(1900)).toBe(false)
+  })
+})