Added tests for Strings algorithms (#390)

* test: added tests for check anagram function

String/ReverseWords.test.js

@@ -0,0 +1,21 @@
+import { reverseWords } from './ReverseWords'
+
+describe('reverseWords', () => {
+  it('expects to reverse words to return a joined word', () => {
+    const SUT = reverseWords('I Love JS')
+    expect(SUT).toBe('JS Love I')
+  })
+  it.each`
+    input
+    ${123456}
+    ${[1, 2, 3, 4, 5, 6]}
+    ${{ test: 'test' }}
+  `(
+    'expects to throw a type error given a value that is $input',
+    ({ input }) => {
+      expect(() => {
+        reverseWords(input)
+      }).toThrow('The given value is not a string')
+    }
+  )
+})