Task 4 nodejs basic-api

src/01-simple-tests/index.test.ts

@@ -1,32 +1,46 @@
-// Uncomment the code below and write your tests
-// import { simpleCalculator, Action } from './index';
+import { simpleCalculator, Action } from './index';
 
 describe('simpleCalculator tests', () => {
   test('should add two numbers', () => {
-    // Write your test here
+    const total = simpleCalculator({ a: 4, b: 2, action: Action.Add });
+    expect(total).toBe(6);
   });
 
   test('should subtract two numbers', () => {
-    // Write your test here
+    const total = simpleCalculator({ a: 4, b: 2, action: Action.Subtract });
+    expect(total).toBe(2);
   });
 
   test('should multiply two numbers', () => {
-    // Write your test here
+    const total = simpleCalculator({ a: 4, b: 2, action: Action.Multiply });
+    expect(total).toBe(8);
   });
 
   test('should divide two numbers', () => {
-    // Write your test here
+    const total = simpleCalculator({ a: 4, b: 2, action: Action.Divide });
+    expect(total).toBe(2);
   });
 
   test('should exponentiate two numbers', () => {
-    // Write your test here
+    const total = simpleCalculator({ a: 4, b: 2, action: Action.Exponentiate });
+    expect(total).toBe(16);
   });
 
   test('should return null for invalid action', () => {
-    // Write your test here
+    const total = simpleCalculator({
+      a: 4,
+      b: 2,
+      action: '',
+    });
+    expect(total).toBe(null);
   });
 
   test('should return null for invalid arguments', () => {
-    // Write your test here
+    const total = simpleCalculator({
+      a: '',
+      b: 2,
+      action: Action.Exponentiate,
+    });
+    expect(total).toBe(null);
   });
 });

src/02-table-tests/index.test.ts

@@ -1,17 +1,23 @@
 // Uncomment the code below and write your tests
-/* import {  simpleCalculator, Action } from './index';
+import { simpleCalculator, Action } from './index';
 
 const testCases = [
-    { a: 1, b: 2, action: Action.Add, expected: 3 },
-    { a: 2, b: 2, action: Action.Add, expected: 4 },
-    { a: 3, b: 2, action: Action.Add, expected: 5 },
-    // continue cases for other actions    
-]; */
+  { a: 1, b: 2, action: Action.Add, expected: 3 },
+  { a: 2, b: 2, action: Action.Add, expected: 4 },
+  { a: 3, b: 2, action: Action.Add, expected: 5 },
+  // cases from previous test
+  { a: 4, b: 2, action: Action.Add, expected: 6 },
+  { a: 4, b: 2, action: Action.Subtract, expected: 2 },
+  { a: 4, b: 2, action: Action.Multiply, expected: 8 },
+  { a: 4, b: 2, action: Action.Divide, expected: 2 },
+  { a: 4, b: 2, action: Action.Exponentiate, expected: 16 },
+  { a: 4, b: 2, action: '', expected: null },
+  { a: '', b: 2, action: Action.Exponentiate, expected: null },
+];
 
 describe('simpleCalculator', () => {
-  // This test case is just to run this test suite, remove it when you write your own tests
-  test('should blah-blah', () => {
-    expect(true).toBe(true);
-  });
   // Consider to use Jest table tests API to test all cases above
+  test.each(testCases)('table tests', ({ a, b, action, expected }) => {
+    expect(simpleCalculator({ a, b, action })).toBe(expected);
+  });
 });

src/03-error-handling-async/index.test.ts

@@ -1,30 +1,38 @@
-// Uncomment the code below and write your tests
-// import { throwError, throwCustomError, resolveValue, MyAwesomeError, rejectCustomError } from './index';
+import {
+  throwError,
+  throwCustomError,
+  resolveValue,
+  MyAwesomeError,
+  rejectCustomError,
+} from './index';
 
 describe('resolveValue', () => {
   test('should resolve provided value', async () => {
-    // Write your test here
+    const value = 'hello';
+    await expect(resolveValue(value)).resolves.toBe(value);
   });
 });
 
 describe('throwError', () => {
   test('should throw error with provided message', () => {
-    // Write your test here
+    const msg = 'error';
+    expect(() => throwError(msg)).toThrow(msg);
   });
 
   test('should throw error with default message if message is not provided', () => {
-    // Write your test here
+    const defaultMessage = 'Oops!';
+    expect(() => throwError()).toThrow(defaultMessage);
   });
 });
 
 describe('throwCustomError', () => {
   test('should throw custom error', () => {
-    // Write your test here
+    expect(() => throwCustomError()).toThrow(MyAwesomeError);
   });
 });
 
 describe('rejectCustomError', () => {
   test('should reject custom error', async () => {
-    // Write your test here
+    await expect(rejectCustomError()).rejects.toThrow(MyAwesomeError);
   });
 });

src/04-test-class/index.test.ts

@@ -1,44 +1,110 @@
-// Uncomment the code below and write your tests
-// import { getBankAccount } from '.';
+import {
+  getBankAccount,
+  InsufficientFundsError,
+  SynchronizationFailedError,
+  TransferFailedError,
+} from '.';
 
 describe('BankAccount', () => {
   test('should create account with initial balance', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const bankAccount = getBankAccount(initialBalance);
+    expect(bankAccount.getBalance()).toBe(initialBalance);
   });
 
   test('should throw InsufficientFundsError error when withdrawing more than balance', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const withdrawAmount = 15;
+    const bankAccount = getBankAccount(initialBalance);
+
+    expect(() => bankAccount.withdraw(withdrawAmount)).toThrow(
+      InsufficientFundsError,
+    );
   });
 
   test('should throw error when transferring more than balance', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const transferAmount = 15;
+    const fromBankAccount = getBankAccount(initialBalance);
+    const toBankAccount = getBankAccount(initialBalance);
+
+    expect(() =>
+      fromBankAccount.transfer(transferAmount, toBankAccount),
+    ).toThrow(InsufficientFundsError);
   });
 
   test('should throw error when transferring to the same account', () => {
-    // Write your test here
+    const initialBalance = 0;
+    const transferAmount = 15;
+    const bankAccount = getBankAccount(initialBalance);
+
+    expect(() => bankAccount.transfer(transferAmount, bankAccount)).toThrow(
+      TransferFailedError,
+    );
   });
 
   test('should deposit money', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const depositAmount = 10;
+    const bankAccount = getBankAccount(initialBalance);
+
+    expect(bankAccount.deposit(depositAmount).getBalance()).toEqual(
+      initialBalance + depositAmount,
+    );
   });
 
   test('should withdraw money', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const withdrawAmount = 10;
+    const bankAccount = getBankAccount(initialBalance);
+
+    expect(bankAccount.withdraw(withdrawAmount).getBalance()).toEqual(
+      initialBalance - withdrawAmount,
+    );
   });
 
   test('should transfer money', () => {
-    // Write your test here
+    const initialBalance = 10;
+    const bankAccount = getBankAccount(initialBalance);
+    const toAccount = getBankAccount(0);
+
+    expect(bankAccount.transfer(10, toAccount).getBalance()).toBe(0);
   });
 
   test('fetchBalance should return number in case if request did not failed', async () => {
-    // Write your tests here
+    const initialBalance = 10;
+    const bankAccount = getBankAccount(initialBalance);
+
+    expect(bankAccount.fetchBalance()).resolves.toBeDefined();
   });
 
   test('should set new balance if fetchBalance returned number', async () => {
-    // Write your tests here
+    const initialBalance = 10;
+    const newBalance = 10;
+    const bankAccount = getBankAccount(initialBalance);
+
+    // Mock the method not assigned it
+    const fetchBalanceSpy = jest.spyOn(bankAccount, 'fetchBalance');
+
+    // bankAccount.fetchBalance = () => Promise.resolve(newBalance);
+    // const balance = await bankAccount.fetchBalance();
+    // if (balance) {
+    //   await expect(bankAccount.getBalance()).toBe(balance);
+    // }
+    await bankAccount.synchronizeBalance();
+    expect(bankAccount.getBalance()).toEqual(newBalance);
   });
 
   test('should throw SynchronizationFailedError if fetchBalance returned null', async () => {
-    // Write your tests here
+    const initialBalance = 10;
+    const bankAccount = getBankAccount(initialBalance);
+
+    const balance = await bankAccount.fetchBalance();
+
+    if (!balance) {
+      await expect(() => bankAccount.synchronizeBalance).toThrow(
+        SynchronizationFailedError,
+      );
+    }
   });
 });

src/05-partial-mocking/index.test.ts

@@ -1,8 +1,16 @@
-// Uncomment the code below and write your tests
-// import { mockOne, mockTwo, mockThree, unmockedFunction } from './index';
+import { mockOne, mockTwo, mockThree, unmockedFunction } from './index';
 
 jest.mock('./index', () => {
-  // const originalModule = jest.requireActual<typeof import('./index')>('./index');
+  const originalModule =
+    jest.requireActual<typeof import('./index')>('./index');
+
+  return {
+    __esModule: true,
+    ...originalModule,
+    mockOne: jest.fn(),
+    mockTwo: jest.fn(),
+    mockThree: jest.fn(),
+  };
 });
 
 describe('partial mocking', () => {
@@ -11,10 +19,27 @@ describe('partial mocking', () => {
   });
 
   test('mockOne, mockTwo, mockThree should not log into console', () => {
-    // Write your test here
+    const consoleSpy = jest.spyOn(global.console, 'log');
+
+    mockOne();
+    mockTwo();
+    mockThree();
+    expect(mockOne).toHaveBeenCalled();
+    expect(mockTwo).toHaveBeenCalled();
+    expect(mockThree).toHaveBeenCalled();
+
+    expect(consoleSpy).not.toHaveBeenCalled();
+    consoleSpy.mockRestore();
   });
 
   test('unmockedFunction should log into console', () => {
-    // Write your test here
+    const consoleSpy = jest.spyOn(global.console, 'log');
+
+    unmockedFunction();
+
+    expect(consoleSpy).toHaveBeenCalled();
+    expect(consoleSpy).toHaveBeenCalledTimes(1);
+    expect(consoleSpy).toHaveBeenCalledWith('I am not mocked');
+    consoleSpy.mockRestore();
   });
 });