merge: Add proper tests for binary search (TheAlgorithms#987)

* feat: added alternative binary search

* fix: exchange "dir" for "high"

* fix : fixing code style

* fix: fixed readability

* fix: fixed code smells

* fix: remove binary search alternative

* feat: added tests of binary search interative and recursive

* fix: fixed wrong identation

* fix: refactoring duplicated code of tests

Author: CarlosZoft

Search/BinarySearch.js

@@ -50,42 +50,3 @@ function binarySearchIterative (arr, x, low = 0, high = arr.length - 1) {
 }
 
 export { binarySearchIterative, binarySearchRecursive }
-
-/* ---------------------------------- Test ---------------------------------- */
-
-// const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
-// const stringArr = [
-//   'Alpha',
-//   'Bravo',
-//   'Charlie',
-//   'Delta',
-//   'Echo',
-//   'Foxtrot',
-//   'Golf',
-//   'Hotel',
-//   'India',
-//   'Juliet',
-//   'Kilo',
-//   'Lima',
-//   'Mike',
-//   'November',
-//   'Oscar',
-//   'Papa',
-//   'Quebec',
-//   'Romeo',
-//   'Sierra',
-//   'Tango',
-//   'Uniform',
-//   'Victor',
-//   'Whiskey',
-//   'X-Ray',
-//   'Yankee',
-//   'Zulu'
-// ]
-
-// binarySearchRecursive(arr, 3)
-// binarySearchIterative(arr, 7)
-// binarySearchRecursive(arr, 13)
-// binarySearchIterative(stringArr, 'Charlie')
-// binarySearchRecursive(stringArr, 'Zulu')
-// binarySearchIterative(stringArr, 'Sierra')

Search/test/BinarySearch.test.js

@@ -0,0 +1,49 @@
+import { binarySearchIterative, binarySearchRecursive } from '../BinarySearch'
+
+const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+const stringArr = [
+  'Alpha',
+  'Bravo',
+  'Charlie',
+  'Delta',
+  'Echo',
+  'Foxtrot',
+  'Golf',
+  'Hotel',
+  'India',
+  'Juliet',
+  'Kilo',
+  'Lima',
+  'Mike',
+  'November',
+  'Oscar',
+  'Papa',
+  'Quebec',
+  'Romeo',
+  'Sierra',
+  'Tango',
+  'Uniform',
+  'Victor',
+  'Whiskey',
+  'X-Ray',
+  'Yankee',
+  'Zulu'
+]
+
+describe('Binary Search', () => {
+  const funcs = [binarySearchIterative, binarySearchRecursive]
+  for (const func of funcs) {
+    test('expect to return the index of the item in the array', () => {
+      expect(func(arr, 3)).toBe(2)
+    })
+    test('expect to return -1 if not in array', () => {
+      expect(func(arr, 11)).toBe(-1)
+    })
+    test('expect to return the index of the item in the array', () => {
+      expect(func(stringArr, 'Charlie')).toBe(2)
+    })
+    test('expect to return -1 if not in array', () => {
+      expect(func(stringArr, 'Zoft')).toBe(-1)
+    })
+  }
+})