Migrate doctest for CocktailShakerSort.js

(also remove inline test driver code)

Author: defaude

Sorts/CocktailShakerSort.js

@@ -1,26 +1,14 @@
-/*
+/**
  * Cocktail Shaker Sort is an algorithm that is a Bidirectional Bubble Sort.
+ *
  * The algorithm extends bubble sort by operating in two directions.
- * While it improves on bubble sort by more quickly moving items to the beginning of the list,
- * it provides only marginal performance improvements.
+ * While it improves on bubble sort by more quickly moving items to the beginning of the list, it provides only marginal
+ * performance improvements.
  *
  * Wikipedia (Cocktail Shaker Sort): https://en.wikipedia.org/wiki/Cocktail_shaker_sort
  * Wikipedia (Bubble Sort): https://en.wikipedia.org/wiki/Bubble_sort
- *
- */
-
-/**
- * Doctests
- *
- * > cocktailShakerSort([5, 4, 1, 2, 3])
- * [1, 2, 3, 4, 5]
- * > cocktailShakerSort([])
- * []
- * > cocktailShakerSort([1, 2, 3])
- * [1, 2, 3]
  */
-
-function cocktailShakerSort (items) {
+export function cocktailShakerSort (items) {
   for (let i = items.length - 1; i > 0; i--) {
     let j
 
@@ -41,15 +29,3 @@ function cocktailShakerSort (items) {
 
   return items
 }
-
-/**
-* Implementation of Cocktail Shaker Sort
-*/
-const array = [5, 6, 7, 8, 1, 2, 12, 14]
-// Before Sort
-console.log('\n- Before Sort | Implementation of Cocktail Shaker Sort -')
-console.log(array)
-// After Sort
-console.log('- After Sort | Implementation of Cocktail Shaker Sort -')
-console.log(cocktailShakerSort(array))
-console.log('\n')

Sorts/test/CocktailShakerSort.test.js

@@ -0,0 +1,13 @@
+import { cocktailShakerSort } from '../CocktailShakerSort'
+
+describe('CocktailShakerSort', () => {
+  it('should sort arrays correctly', () => {
+    expect(cocktailShakerSort([5, 4, 1, 2, 3])).toEqual([1, 2, 3, 4, 5])
+    expect(cocktailShakerSort([1, 2, 3])).toEqual([1, 2, 3])
+    expect(cocktailShakerSort([5, 6, 7, 8, 1, 2, 12, 14])).toEqual([1, 2, 5, 6, 7, 8, 12, 14])
+  })
+
+  it('should work for empty arrays, too', () => {
+    expect(cocktailShakerSort([])).toEqual([])
+  })
+})