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

Maths/test/GridGet.test.js

@@ -0,0 +1,16 @@
+import { gridGetX, gridGetY } from '../GridGet'
+
+describe('GridGet', () => {
+  it('should have a value of x for the 27th element if the square array has 400 elements', () => {
+    expect(gridGetX(Math.sqrt(400), 27)).toEqual(8)
+  })
+  it('should have a value of x for the 11th element if the square array has 7 columns and 3 rows', () => {
+    expect(gridGetX(7, 11)).toEqual(5)
+  })
+  it('should have a value of y for the 27th element if the square array has 400 elements', () => {
+    expect(gridGetY(Math.sqrt(400), 27)).toEqual(2)
+  })
+  it('should have a value of y for the 11th element if the square array has 7 columns and 3 rows ', () => {
+    expect(gridGetX(7, 11)).toEqual(5)
+  })
+})