Coverage thresholds in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the minimum line coverage threshold to 80%.

JUnit

@Rule
public final TestRule coverage = new CoverageRule().withLineThreshold([1]);

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

A75

B90

C80

D70

Attempts:

3 left

💡 Hint

Common Mistakes

Using a value less than desired threshold like 70 instead of 80.

Including the % sign in the number.

The method withLineThreshold sets the minimum line coverage percentage. Here, 80 means 80% coverage is required.

2fill in blank

medium

Complete the code to fail the test if branch coverage is below 85%.

JUnit

@Rule
public final TestRule coverage = new CoverageRule().withBranchThreshold([1]);

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

A80

B85

C90

D75

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the threshold too low, which may allow insufficient coverage.

Confusing line coverage with branch coverage.

The withBranchThreshold method sets the minimum branch coverage percentage. 85 means the test fails if branch coverage is below 85%.

3fill in blank

hard

Fix the error in the code to correctly set the coverage threshold to 75%.

JUnit

@Rule
public final TestRule coverage = new CoverageRule().withLineThreshold([1]);

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

A75

B"75%"

C0.75

DseventyFive

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string with % sign like "75%".

Using a decimal like 0.75 instead of 75.

The threshold value must be an integer representing the percentage without quotes or decimals. So 75 is correct.

4fill in blank

hard

Fill both blanks to set line coverage to 80% and branch coverage to 70%.

JUnit

@Rule
public final TestRule coverage = new CoverageRule()
    .withLineThreshold([1])
    .withBranchThreshold([2]);

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

A80

B70

C75

D85

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the values between line and branch thresholds.

Using values outside typical coverage ranges.

The first blank sets line coverage threshold to 80%, the second sets branch coverage threshold to 70%.

5fill in blank

hard

Fill all three blanks to set line coverage to 85%, branch coverage to 80%, and fail on uncovered methods.

JUnit

@Rule
public final TestRule coverage = new CoverageRule()
    .withLineThreshold([1])
    .withBranchThreshold([2])
    .failOnUncoveredMethods([3]);

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

Atrue

Bfalse

C80

D85

Attempts:

3 left

💡 Hint

Common Mistakes

Using false instead of true for failOnUncoveredMethods.

Mixing up the coverage threshold values.

Set line coverage to 85 (D), branch coverage to 80 (C), and enable fail on uncovered methods with true (A).