Why advanced mocking handles complex dependencies in JUnit - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a mock object using Mockito.

JUnit

MyService service = Mockito.[1](MyService.class);

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

Amock

Bspy

Cverify

Dwhen

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'spy' instead of 'mock' creates a partial mock, not a full mock.

Using 'verify' or 'when' does not create mocks.

Mockito.mock() creates a mock object for the given class.

2fill in blank

medium

Complete the code to stub a method call to return a specific value.

JUnit

Mockito.[1](service.getData()).thenReturn("mocked data");

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

Aspy

Bverify

Cmock

Dwhen

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'verify' instead of 'when' is for checking calls, not stubbing.

Using 'mock' or 'spy' here is incorrect.

Mockito.when() is used to stub a method call to return a desired value.

3fill in blank

hard

Fix the error in verifying that a method was called exactly once.

JUnit

Mockito.verify(service, Mockito.[1]()).process();

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Atimes(2)

Btimes(1)

Conce()

Dnever()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'once()' causes a compilation error because it is not a valid Mockito method.

Using 'times(2)' checks for two calls, not one.

Mockito.times(1) verifies the method was called exactly once. 'once()' does not exist.

4fill in blank

hard

Fill both blanks to mock a complex dependency and stub its method.

JUnit

Dependency dep = Mockito.[1](Dependency.class);
Mockito.[2](dep.getValue()).thenReturn(42);

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

Amock

Bwhen

Cspy

Dverify

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'spy' instead of 'mock' creates a partial mock, which may not be desired.

Using 'verify' instead of 'when' is incorrect for stubbing.

First, create a mock with mock(). Then stub the method with when().

5fill in blank

hard

Fill all three blanks to verify a method call with argument matcher and times.

JUnit

Mockito.verify(service, Mockito.[1](3)).execute(Mockito.[2]("test"), Mockito.[3]());

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

Atimes

Beq

Cany

Dnever

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'never' instead of 'times' causes verification to expect zero calls.

Using 'any' instead of 'eq' loses exact argument matching.

Use times(3) to check call count, eq("test") to match exact argument, and any() for any argument.