tests: Project Euler Problem 2 (#1200)

Project-Euler/test/Problem002.test.js

@@ -0,0 +1,14 @@
+import { EvenFibonacci } from '../Problem002'
+
+describe('Even Fibonacci numbers', () => {
+  it('should throw error when limit is less than 1', () => {
+    expect(() => EvenFibonacci(-1)).toThrowError('Fibonacci sequence limit can\'t be less than 1')
+  })
+  test('when limit is greater than 0', () => {
+    expect(EvenFibonacci(40)).toBe(44)
+  })
+  // Project Euler Condition Check
+  test('when limit is 4 million', () => {
+    expect(EvenFibonacci(4e6)).toBe(4613732)
+  })
+})