MockK for mocking in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a mock of the UserRepository class using MockK.

Android Kotlin

val userRepository = [1]<UserRepository>()

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Amockk

Bspyk

Cevery

Dverify

Attempts:

3 left

💡 Hint

Common Mistakes

Using spyk instead of mockk when a pure mock is needed.

Trying to use every or verify to create a mock.

Use mockk to create a mock object in MockK.

2fill in blank

medium

Complete the code to stub the getUserName() method to return "Alice".

Android Kotlin

every { userRepository.[1]() } returns "Alice"

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AgetUserId

BgetUserName

CfetchUser

DloadName

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that does not exist in the class.

Confusing getUserId with getUserName.

The method to stub is getUserName as it returns the user name.

3fill in blank

hard

Fix the error in verifying that getUserName() was called exactly once.

Android Kotlin

verify(exactly = [1]) { userRepository.getUserName() }

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A1

B2

Cany

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero which means never called.

Using 'any' which is not a valid number.

Use exactly = 1 to verify the method was called once.

4fill in blank

hard

Fill both blanks to create a spy of UserService and stub fetchData() to return "Data".

Android Kotlin

val userService = [1]<UserService>()
every { userService.[2]() } returns "Data"

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Aspyk

Bmockk

CfetchData

DgetData

Attempts:

3 left

💡 Hint

Common Mistakes

Using mockk instead of spyk for spying.

Stubbing a method name that does not exist.

Use spyk to create a spy and stub the fetchData method.

5fill in blank

hard

Fill all three blanks to verify that saveUser() was called with any User object exactly twice.

Android Kotlin

verify(exactly = [1]) { userRepository.saveUser([2]) }

val slot = slot<User>()
verify { userRepository.saveUser(capture(slot)) }

assert(slot.captured.name == [3])

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A2

Bany()

C"Alice"

D"Bob"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong number for calls.

Not using any() matcher.

Asserting wrong user name.

Verify called twice, with any User object, and assert the captured user's name is "Alice".