Added tests for Strings algorithms (#390)

* test: added tests for check anagram function

String/CheckAnagram.test.js

@@ -0,0 +1,31 @@
+import { checkAnagram } from './CheckAnagram'
+
+describe('checkAnagram', () => {
+  it.each`
+    inputOne              | inputTwo
+    ${123456}             | ${'abcd'}
+    ${[1, 2, 3, 4, 5, 6]} | ${'abcd'}
+    ${{ test: 'test' }}   | ${'abcd'}
+    ${'abcd'}             | ${123456}
+    ${'abcd'}             | ${[1, 2, 3, 4, 5, 6]}
+    ${'abcd'}             | ${{ test: 'test' }}
+  `(
+    'expects to return "Not string(s)" given values $inputOne and $inputTwo',
+    ({ inputOne, inputTwo }) => {
+      const SUT = checkAnagram(inputOne, inputTwo)
+      expect(SUT).toBe('Not string(s)')
+    }
+  )
+  it('expects to return "Not anagram" if the arguments have different lengths', () => {
+    const SUT = checkAnagram('abs', 'abds')
+    expect(SUT).toBe('Not Anagram')
+  })
+  it('expects to return "Not anagram" if the arguments are not anagrams', () => {
+    const SUT = checkAnagram('abcs', 'abds')
+    expect(SUT).toBe('Not anagrams')
+  })
+  it('expects to return "Anagram" if the arguments are anagram', () => {
+    const SUT = checkAnagram('abcd', 'bcad')
+    expect(SUT).toBe('Anagrams')
+  })
+})