Add tests to Math (#423)

* Add prettier config

* test: add test to check for absolute function

* chore: es5 to es6

* test: add test to check mean function

* test: add test for sum of digit

* test: add test for factorial

* test: add test for fibonnaci

* test: add test for find HCF

* test: add test for lcm

* test: add gridget test

* test: add test for mean square error

* test: add test for modular binary exponentiation

* test: add tests for palindrome

* test: add test for pascals triangle

* test: add tests for polynomial

* test: add tests for prime check

* test: add tests for reverse polish notation

* test: add tests for sieve of eratosthenes

* test: add tests for pi estimation monte carlo method

* chore: move tests to test folder

* chore: fix standardjs errors

String/test/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 anagrams')
+  })
+  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')
+  })
+})