Verification times (times, never, atLeast) in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to verify that the method process() was called exactly once.

JUnit

verify(mockObject, [1]).process();

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AatLeast(1)

Bnever()

Ctimes(1)

Dtimes(0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using never() will check that the method was never called.

Using atLeast(1) allows one or more calls, not exactly one.

Using times(1) verifies that the method was called exactly once.

2fill in blank

medium

Complete the code to verify that the method save() was never called.

JUnit

verify(mockObject, [1]).save();

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Anever()

Btimes(1)

CatLeast(1)

Dtimes(0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using times(0) is similar but never() is clearer.

Using atLeast(1) would allow calls, which is incorrect here.

Using never() verifies that the method was not called at all.

3fill in blank

hard

Fix the error in the verification to check that update() was called at least twice.

JUnit

verify(mockObject, [1]).update();

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Atimes(2)

Bnever()

Ctimes(1)

DatLeast(2)

Attempts:

3 left

💡 Hint

Common Mistakes

Using times(2) checks for exactly two calls, not at least two.

Using never() means no calls, which is wrong here.

Using atLeast(2) verifies that the method was called two or more times.

4fill in blank

hard

Fill both blanks to verify that delete() was called exactly three times and create() was never called.

JUnit

verify(mockObject, [1]).delete();
verify(mockObject, [2]).create();

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Atimes(3)

Bnever()

CatLeast(1)

Dtimes(1)

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up never() and times(0).

Using atLeast(1) instead of times(3) for exact calls.

Use times(3) to check exactly three calls and never() to check zero calls.

5fill in blank

hard

Fill all three blanks to verify that start() was called at least once, stop() was called exactly twice, and reset() was never called.

JUnit

verify(mockObject, [1]).start();
verify(mockObject, [2]).stop();
verify(mockObject, [3]).reset();

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

AatLeast(1)

Btimes(2)

Cnever()

Dtimes(1)

Attempts:

3 left

💡 Hint

Common Mistakes

Using times(1) instead of atLeast(1) for the start() method.

Confusing never() with times(0).

Use atLeast(1) for one or more calls, times(2) for exactly two calls, and never() for zero calls.