Mocking and stubbing in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a mock object in Ruby.

Ruby

mock_user = double([1])

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

A:user

B"User"

CUser.new

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a symbol.

Trying to instantiate a real object instead of a mock.

In Ruby, double(:user) creates a mock object named :user.

2fill in blank

medium

Complete the code to stub the method 'name' to return 'Alice'.

Ruby

allow(mock_user).to receive(:name).and_return([1])

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

A"Alice"

Bname

C:Alice

DAlice

Attempts:

3 left

💡 Hint

Common Mistakes

Using a symbol instead of a string.

Not quoting the return value.

Use a string "Alice" to return the name properly.

3fill in blank

hard

Fix the error in the code to expect the method 'greet' to be called once.

Ruby

expect(mock_user).to [1](:greet).once

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

Areceive_message

Bcall

Cexpect_message

Dreceive

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect matcher names.

Omitting the receive keyword.

The correct syntax is expect(mock_user).to receive(:greet).once.

4fill in blank

hard

Fill both blanks to stub a method 'age' that returns 30 only if called with argument 'true'.

Ruby

allow(mock_user).to receive(:age).with([1]).and_return([2])

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

Atrue

Bfalse

C30

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Using false instead of true.

Returning the wrong number.

The method age is stubbed to return 30 when called with true.

5fill in blank

hard

Fill all three blanks to create a mock, stub 'status' to 'active', and expect 'update' to be called once.

Ruby

mock_account = double([1])
allow(mock_account).to receive(:status).and_return([2])
expect(mock_account).to receive([3]).once

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

A:account

B"active"

C:update

D:status

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong symbols or strings for mock name or return value.

Expecting the wrong method to be called.

This code creates a mock named :account, stubs status to return "active", and expects update to be called once.