Test lifecycle hooks (before, after) in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a setup function before all tests.

Node.js

beforeAll(() => [1]);

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AinitializeDatabase()

BrunTests()

Ccleanup()

DlogResults()

Attempts:

3 left

💡 Hint

Common Mistakes

Putting test-running code inside beforeAll instead of setup code.

Using cleanup functions in beforeAll instead of afterAll.

The beforeAll hook runs once before all tests. You put setup code like initializeDatabase() inside it.

2fill in blank

medium

Complete the code to run a cleanup function after each test.

Node.js

afterEach(() => [1]);

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AresetMocks()

BstartServer()

CinitializeDatabase()

DrunTests()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to start servers after each test instead of resetting state.

Using afterEach for setup tasks.

The afterEach hook runs after every test. It's good for cleanup like resetMocks() to keep tests independent.

3fill in blank

hard

Fix the error in the test lifecycle hook to properly close the server after all tests.

Node.js

afterAll(() => [1]);

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AinitializeDatabase()

Bserver.start()

Cserver.close()

DrunTests()

Attempts:

3 left

💡 Hint

Common Mistakes

Calling server.start() in afterAll instead of closing it.

Not cleaning up resources after tests.

The afterAll hook runs once after all tests. You should close resources like servers with server.close() here.

4fill in blank

hard

Fill both blanks to run setup before each test and cleanup after each test.

Node.js

beforeEach(() => [1]);
afterEach(() => [2]);

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AresetDatabase()

BinitializeMocks()

CclearMocks()

DstartServer()

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up initialization and cleanup functions.

Not resetting mocks properly between tests.

beforeEach runs before every test, so you initialize mocks there. afterEach runs after every test, so you clear mocks to keep tests clean.

5fill in blank

hard

Fill all three blanks to run setup once before all tests, setup before each test, and cleanup once after all tests.

Node.js

beforeAll(() => [1]);
beforeEach(() => [2]);
afterAll(() => [3]);

Drag options to blanks, or click blank then click option'

AconnectDatabase()

BresetMocks()

CdisconnectDatabase()

DinitializeMocks()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to connect or disconnect the database before or after each test instead of once.

Not initializing mocks before each test.

beforeAll runs once to connect the database. beforeEach runs before each test to initialize mocks. afterAll runs once to disconnect the database.