Add fibonacci tests

src/_Classics_/fibonacci/fibonacci.test.js

@@ -0,0 +1,39 @@
+const { fibonacci, fibonacciMemoized, fibonacciTabular } = require('.');
+
+describe('Find the Fibonacci Sum for a given index', () => {
+
+    it('should return 1 when index is 0', () => {
+        expect(fibonacci(0)).toEqual(1);
+        expect(fibonacciMemoized(0)).toEqual(1);
+        expect(fibonacciTabular(0)).toEqual(1); //failing
+    });
+
+    it('should return 1 when index is 1', () => {
+        expect(fibonacci(1)).toEqual(1);
+        expect(fibonacciMemoized(1)).toEqual(1);
+        expect(fibonacciTabular(1)).toEqual(1);
+    });
+
+    it('should return 1 when index is 2', () => {
+        expect(fibonacci(2)).toEqual(1);
+        expect(fibonacciMemoized(2)).toEqual(1);
+        expect(fibonacciTabular(2)).toEqual(1);
+    });
+
+    it('should return 55 when index is 10', () => {
+        expect(fibonacci(10)).toEqual(55);
+        expect(fibonacciTabular(10)).toEqual(55);
+        expect(fibonacciMemoized(10)).toEqual(55);
+    });
+
+    it('should return 1.7147923024004204e+106 when index is 510', () => {
+        expect(fibonacciMemoized(510)).toEqual(1.7147923024004204e+106);
+        expect(fibonacciTabular(510)).toEqual(1.7147923024004204e+106);
+    });
+
+    it('should return 1 when index is negative', () => {
+        expect(fibonacci(-1)).toEqual(1);
+        expect(fibonacciMemoized(-1)).toEqual(1);
+        expect(fibonacciTabular(-1)).toEqual(1); //failing
+    });
+});

src/_Classics_/fibonacci/index.js

@@ -38,7 +38,7 @@ function fibonacciMemoized(index, cache) {
 /**
  * Using the bottom up approach, also known as tabular method
  */
-
+//  @TODO: Handle this function for indexes 0 and negative numbers
 function fibonacciTabular(n) {
   const table = [0, 1];
 
@@ -49,6 +49,12 @@ function fibonacciTabular(n) {
   return table[n];
 }
 
+module.exports = {
+    fibonacci,
+    fibonacciMemoized,
+    fibonacciTabular
+}
+
 // const number = 50;
 
 // console.log(`Fib normal - ${fibonacci(number)}`);