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/Abs.test.js

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+import { absVal } from '../Abs'
+
+describe('absVal', () => {
+  it('should return an absolute value of a negative number', () => {
+    const absOfNegativeNumber = absVal(-34)
+    expect(absOfNegativeNumber).toBe(34)
+  })
+
+  it('should return an absolute value of a positive number', () => {
+    const absOfPositiveNumber = absVal(50)
+    expect(absOfPositiveNumber).toBe(50)
+  })
+})

Maths/test/AverageMean.test.js

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+import { mean } from '../AverageMean'
+
+describe('Tests for average mean', () => {
+  it('should be a function', () => {
+    expect(typeof mean).toEqual('function')
+  })
+  it('should return the mean of an array of numbers', () => {
+    const meanFunction = mean([1, 2, 4, 5])
+    expect(meanFunction).toBe(3)
+  })
+})

Maths/test/DigitSum.test.js

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+import { digitSum } from '../DigitSum'
+
+describe('digitSum', () => {
+  it('is a function', () => {
+    expect(typeof digitSum).toEqual('function')
+  })
+  it('should return the sum of digits of a given number', () => {
+    const sumOfNumber = digitSum(12345)
+    expect(sumOfNumber).toBe(15)
+  })
+})

Maths/test/Factorial.test.js

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+import { calcFactorial } from '../Factorial'
+
+describe('calcFactorial', () => {
+  it('is a function', () => {
+    expect(typeof calcFactorial).toEqual('function')
+  })
+
+  it('should return a statement for value "0"', () => {
+    expect(calcFactorial(0)).toBe('The factorial of 0 is 1.')
+  })
+
+  it('should return a statement for "null" and "undefined"', () => {
+    const nullFactorial = calcFactorial(null)
+    const undefinedFactorial = calcFactorial(undefined)
+
+    expect(nullFactorial).toBe(
+      'Sorry, factorial does not exist for null or undefined numbers.'
+    )
+    expect(undefinedFactorial).toBe(
+      'Sorry, factorial does not exist for null or undefined numbers.'
+    )
+  })
+
+  it('should not support negative numbers', () => {
+    const negativeFactorial = calcFactorial(-5)
+    expect(negativeFactorial).toBe(
+      'Sorry, factorial does not exist for negative numbers.'
+    )
+  })
+
+  it('should return the factorial of a positive number', () => {
+    const positiveFactorial = calcFactorial(3)
+    expect(positiveFactorial).toBe('The factorial of 3 is 6')
+  })
+})

Maths/test/Fibonacci.test.js

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+import {
+  FibonacciDpWithoutRecursion,
+  FibonacciRecursiveDP,
+  FibonacciIterative,
+  FibonacciRecursive
+} from '../Fibonacci'
+
+describe('Fibonanci', () => {
+  it('should return an array of numbers for FibonnaciIterative', () => {
+    expect(FibonacciIterative(5)).toEqual(
+      expect.arrayContaining([1, 1, 2, 3, 5])
+    )
+  })
+
+  it('should return an array of numbers for FibonnaciRecursive', () => {
+    expect(FibonacciRecursive(5)).toEqual(
+      expect.arrayContaining([1, 1, 2, 3, 5])
+    )
+  })
+
+  it('should return number for FibonnaciRecursiveDP', () => {
+    expect(FibonacciRecursiveDP(5)).toBe(5)
+  })
+
+  it('should return an array of numbers for FibonacciDpWithoutRecursion', () => {
+    expect(FibonacciDpWithoutRecursion(5)).toEqual(
+      expect.arrayContaining([1, 1, 2, 3, 5])
+    )
+  })
+})

Maths/test/FindHcf.test.js

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+import { findHCF } from '../FindHcf'
+
+describe('findHCF', () => {
+  it('should throw a statement for values less than 1', () => {
+    expect(findHCF(0, 0)).toBe('Please enter values greater than zero.')
+  })
+
+  it('should throw a statement for one value less than 1', () => {
+    expect(findHCF(0, 1)).toBe('Please enter values greater than zero.')
+    expect(findHCF(1, 0)).toBe('Please enter values greater than zero.')
+  })
+
+  it('should return an error for values non-integer values', () => {
+    expect(findHCF(2.24, 4.35)).toBe('Please enter whole numbers.')
+  })
+
+  it('should return the HCF of two given integers', () => {
+    expect(findHCF(27, 36)).toBe(9)
+  })
+})

Maths/test/FindLcm.test.js

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+import { findLcm } from '../FindLcm'
+
+describe('findLcm', () => {
+  it('should throw a statement for values less than 1', () => {
+    expect(findLcm(0, 0)).toBe('Please enter values greater than zero.')
+  })
+
+  it('should throw a statement for one value less than 1', () => {
+    expect(findLcm(1, 0)).toBe('Please enter values greater than zero.')
+    expect(findLcm(0, 1)).toBe('Please enter values greater than zero.')
+  })
+
+  it('should return an error for values non-integer values', () => {
+    expect(findLcm(4.564, 7.39)).toBe('Please enter whole numbers.')
+  })
+
+  it('should return the LCM of two given integers', () => {
+    expect(findLcm(27, 36)).toBe(108)
+  })
+})

Maths/test/GridGet.test.js

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+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)
+  })
+})

Maths/test/MeanSquareError.test.js

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+import { meanSquaredError } from '../MeanSquareError'
+
+describe('meanSquareError', () => {
+  it('should throw an error on non-array arguments', () => {
+    expect(() => meanSquaredError(1, 4)).toThrow('Argument must be an Array')
+  })
+
+  it('should throw an error on non equal length ', () => {
+    const firstArr = [1, 2, 3, 4, 5]
+    const secondArr = [1, 2, 3]
+    expect(() => meanSquaredError(firstArr, secondArr)).toThrow(
+      'The two lists must be of equal length'
+    )
+  })
+
+  it('should return the mean square error of two equal length arrays', () => {
+    const firstArr = [1, 2, 3, 4, 5]
+    const secondArr = [1, 3, 5, 6, 7]
+    expect(meanSquaredError(firstArr, secondArr)).toBe(2.6)
+  })
+})

Maths/test/ModularBinaryExponentiationRecursive.test.js

@@ -0,0 +1,7 @@
+import { modularBinaryExponentiation } from '../ModularBinaryExponentiationRecursive'
+
+describe('modularBinaryExponentiation', () => {
+  it('should return the binary exponentiation', () => {
+    expect(modularBinaryExponentiation(2, 10, 17)).toBe(4)
+  })
+})

Maths/test/Palindrome.test.js

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+import { PalindromeRecursive, PalindromeIterative } from '../Palindrome'
+
+describe('Palindrome', () => {
+  it('should return true for a palindrome for PalindromeRecursive', () => {
+    expect(PalindromeRecursive('mom')).toBeTruthy()
+  })
+  it('should return true  for a palindrome for PalindromeIterative', () => {
+    expect(PalindromeIterative('mom')).toBeTruthy()
+  })
+  it('should return false for a non-palindrome for PalindromeRecursive', () => {
+    expect(PalindromeRecursive('Algorithms')).toBeFalsy()
+  })
+  it('should return true  for a non-palindrome for PalindromeIterative', () => {
+    expect(PalindromeIterative('JavaScript')).toBeFalsy()
+  })
+})

Maths/test/PascalTriangle.test.js

@@ -0,0 +1,20 @@
+import { generate } from '../PascalTriangle'
+
+describe('Pascals Triangle', () => {
+  it('should have the the same length as the number', () => {
+    const pascalsTriangle = generate(5)
+    expect(pascalsTriangle.length).toEqual(5)
+  })
+  it('should have same length as its index in the array', () => {
+    const pascalsTriangle = generate(5)
+    pascalsTriangle.forEach((arr, index) => {
+      expect(arr.length).toEqual(index + 1)
+    })
+  })
+  it('should return an array of arrays', () => {
+    const pascalsTriangle = generate(3)
+    expect(pascalsTriangle).toEqual(
+      expect.arrayContaining([[1], [1, 1], [1, 2, 1]])
+    )
+  })
+})

Maths/test/PiApproximationMonteCarlo.test.js

@@ -0,0 +1,9 @@
+import { piEstimation } from '../PiApproximationMonteCarlo'
+
+describe('PiApproximationMonteCarlo', () => {
+  it('should be between the range of 2 to 4', () => {
+    const pi = piEstimation()
+    const piRange = pi >= 2 && pi <= 4
+    expect(piRange).toBeTruthy()
+  })
+})

Maths/test/Polynomial.test.js

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+import { Polynomial } from '../Polynomial'
+
+describe('Polynomial', () => {
+  it('should not return a expression for zero', () => {
+    const polynomial = new Polynomial([0])
+    expect(polynomial.display()).toBe('')
+  })
+  it('should not return an expression for zero values', () => {
+    const polynomial = new Polynomial([0, 0, 0, 0, 0])
+    expect(polynomial.display()).toBe('')
+  })
+  it('should return an expression for single a non zero value', () => {
+    const polynomial = new Polynomial([9])
+    expect(polynomial.display()).toBe('(9)')
+  })
+  it('should return an expression for two values', () => {
+    const polynomial = new Polynomial([3, 2])
+    expect(polynomial.display()).toBe('(2x) + (3)')
+  })
+  it('should return an expression for values including zero', () => {
+    const polynomial = new Polynomial([0, 2])
+    expect(polynomial.display()).toBe('(2x)')
+  })
+  it('should return an expression and evaluate it', () => {
+    const polynomial = new Polynomial([1, 2, 3, 4])
+    expect(polynomial.display()).toBe('(4x^3) + (3x^2) + (2x) + (1)')
+    expect(polynomial.evaluate(2)).toEqual(49)
+  })
+  it('should evaluate 0 for zero values', () => {
+    const polynomial = new Polynomial([0, 0, 0, 0])
+    expect(polynomial.evaluate(5)).toEqual(0)
+  })
+  it('should evaluate for negative values', () => {
+    const polynomial = new Polynomial([-1, -3, -4, -7])
+    expect(polynomial.evaluate(-5)).toBe(789)
+  })
+})

Maths/test/PrimeCheck.test.js

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+import { PrimeCheck } from '../PrimeCheck'
+
+describe('PrimeCheck', () => {
+  it('should return true for Prime Numbers', () => {
+    expect(PrimeCheck(1000003)).toBeTruthy()
+  })
+  it('should return false for Non Prime Numbers', () => {
+    expect(PrimeCheck(1000001)).toBeFalsy()
+  })
+  it('should return false for 1 and 0', () => {
+    expect(PrimeCheck(1)).toBeFalsy()
+    expect(PrimeCheck(0)).toBeFalsy()
+  })
+})

Maths/test/ReversePolishNotation.test.js

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+import { calcRPN } from '../ReversePolishNotation'
+
+describe('ReversePolishNotation', () => {
+  it('should evaluate correctly for two values', () => {
+    expect(calcRPN('2 3 +')).toEqual(5)
+  })
+  it("should evaluate' for multiple values", () => {
+    expect(calcRPN('2 2 2 * +')).toEqual(6)
+    expect(calcRPN('6 9 7 + 2 / + 3 *')).toEqual(42)
+  })
+})

Maths/test/SieveOfEratosthenes.test.js

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+import { sieveOfEratosthenes } from '../SieveOfEratosthenes'
+import { PrimeCheck } from '../PrimeCheck'
+
+describe('should return an array of prime booleans', () => {
+  it('should have each element in the array as a prime boolean', () => {
+    const n = 30
+    const primes = sieveOfEratosthenes(n)
+    primes.forEach((primeBool, index) => {
+      if (primeBool) {
+        expect(PrimeCheck(index)).toBeTruthy()
+      }
+    })
+  })
+})