feature: add fast fibonacci algorithm (#1155)

Dynamic-Programming/tests/FastFibonacciNumber.test.js

@@ -0,0 +1,23 @@
+import { fastFibonacci } from '../FastFibonacciNumber'
+
+describe('Testing FibonacciNumber', () => {
+  const errorCases = ['0', '12', true]
+
+  test.each(errorCases)('throws an error if %p is invalid', (input) => {
+    expect(() => {
+      fastFibonacci(input)
+    }).toThrow()
+  })
+
+  const testCases = [
+    [0, 0],
+    [1, 1],
+    [10, 55],
+    [25, 75025],
+    [40, 102334155]
+  ]
+
+  test.each(testCases)('if input is %i it returns %i', (input, expected) => {
+    expect(fastFibonacci(input)).toBe(expected)
+  })
+})