Added test cases

02_calculator/README.md

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+The goal for this exercise is to create a calculator that does the following:
+
+add, subtract, get the sum, multiply, get the power, and find the factorial
+
+In order to do this please fill out each function with your solution. Make sure to return the value so you can test it in Jasmine! To see the expected value
+take a look at the spec file that houses the Jasmine test cases.

02_calculator/calculator.js

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+function add () {
+	
+}
+
+function subtract () {
+	
+}
+
+function sum () {
+	
+}
+
+function multiply () {
+	
+}
+
+function power() {
+	
+}
+
+function factorial() {
+	
+}
+
+module.exports = {
+	add,
+	subtract,
+	sum,
+	multiply,
+    power,
+	factorial
+}

02_calculator/calculator.spec.js

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+var calculator = require ('./calculator.js');
+
+describe('add', function() {
+	it('adds 0 and 0', function() {
+		expect(calculator.add(0,0)).toEqual(0);
+	});
+
+	it('adds 2 and 2', function() {
+		expect(calculator.add(2,2)).toEqual(4);
+	});
+
+	it('adds positive numbers', function() {
+		expect(calculator.add(2,6)).toEqual(8);
+	});
+});
+
+describe('subtract', function() {
+	it('subtracts numbers', function() {
+		expect(calculator.subtract(10,4)).toEqual(6);
+	});
+});
+
+describe('sum', function() {
+	it('computes the sum of an empty array', function() {
+		expect(calculator.sum([])).toEqual(0);
+	});
+
+	it('computes the sum of an array of one number', function() {
+		expect(calculator.sum([7])).toEqual(7);
+	});
+
+	it('computes the sum of an array of one number', function() {
+		expect(calculator.sum([7,11])).toEqual(18);
+	});
+
+	it('computes the sum of an array of many numbers', function() {
+		expect(calculator.sum([1,3,5,7,9])).toEqual(25);
+	});
+});
+
+describe('multiply', function() {
+	it('multiplies two numbers', function() {
+		expect(calculator.multiply([2,4])).toEqual(8);
+	});
+
+	it('multiplies several numbers', function() {
+		expect(calculator.multiply([2,4,6,8,10,12,14])).toEqual(645120);
+	});
+});
+
+describe('power', function() {
+	it('raises one number to the power of another number', function() {
+		expect(calculator.power(4,3)).toEqual(64); // 4 to third power is 64
+	});
+});
+
+describe('factorial', function() {
+	it('computes the factorial of 0', function() {
+		expect(calculator.factorial(0)).toEqual(0);
+	});
+
+	it('computes the factorial of 1', function() {
+		expect(calculator.factorial(1)).toEqual(1);
+	});
+
+	it('computes the factorial of 2', function() {
+		expect(calculator.factorial(2)).toEqual(2);
+	});
+
+	it('computes the factorial of 5', function() {
+		expect(calculator.factorial(5)).toEqual(120);
+	});
+
+	it('computes the factorial of 10', function() {
+		expect(calculator.factorial(10)).toEqual(3628800);
+	});
+});