add tests

Author: CheezItMan

Diff for: test/calculator.test.js

@@ -0,0 +1,173 @@
+const calculateUserInput = require('../calculator').calculateUserInput;
+
+describe('calculateUserInput', () => {
+  let standardOutput = null;
+
+  // Before each test replace standard output (console.log)
+  // with a "mock" function so we can see that console.log
+  // was called with the proper parameters.
+  beforeEach(() => {
+    standardOutput = console.log;
+    console.log = jest.fn(str => str);
+  });
+
+  // After each test restore console.log
+  afterEach(() => {
+    console.log = standardOutput;
+  })
+  test('3 + 4 = 7', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '4',
+      operation: '+',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 + 4 = 7']);
+  });
+
+  test('3 + 4 = 7 with "add"', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '4',
+      operation: 'add',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 + 4 = 7']);
+  });
+  test('3 + -4 = -1', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '-4',
+      operation: '+',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 + -4 = -1']);
+  });
+
+  test('3 + -4 = -1 with "add"', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '-4',
+      operation: 'add',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 + -4 = -1']);
+  });
+
+  test('3 * 4 = 12', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '4',
+      operation: '*',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 * 4 = 12']);
+  });
+
+  test('3 * 4 = 12 with "multiply"', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '4',
+      operation: 'multiply',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 * 4 = 12']);
+  });
+
+  test('3 * -4 = -12', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '-4',
+      operation: '*',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 * -4 = -12']);
+  });
+
+  test('3 * -4 = -12, with "multiply', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '-4',
+      operation: '*',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 * -4 = -12']);
+  });
+
+  test('3 * 0 = 0', () => {
+
+    calculateUserInput({}, {
+      num1: '3',
+      num2: '0',
+      operation: '*',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['3 * 0 = 0']);
+  });
+
+  test('15 / 3 = 5', () => {
+
+    calculateUserInput({}, {
+      num1: '15',
+      num2: '3',
+      operation: '/',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['15 / 3 = 5']);
+  });
+
+  test('15 / 3 = 5 with "divide"', () => {
+
+    calculateUserInput({}, {
+      num1: '15',
+      num2: '3',
+      operation: 'divide',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['15 / 3 = 5']);
+  });
+
+  test('-15 / 3 = 5', () => {
+
+    calculateUserInput({}, {
+      num1: '-15',
+      num2: '3',
+      operation: '/',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['-15 / 3 = -5']);
+  });
+
+  test('Can catch divideByZero errors', () => {
+
+    calculateUserInput({}, {
+      num1: '15',
+      num2: '0',
+      operation: '/',
+    });
+
+    expect(console.log).toHaveBeenCalled();
+    expect(console.log.mock.calls).toContainEqual(['You cannot divide by zero']);
+  });
+});
+