assertAll for grouped assertions in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to group multiple assertions using assertAll.

JUnit

assertAll([1]);

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

A"Test group", () -> { assertEquals(5, sum); assertTrue(flag); }

B"Test group", () -> { assertEquals(5, sum); }

CassertEquals(5, sum)

DassertTrue(flag)

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertAll with only one assertion without a lambda.

Passing assertions outside a lambda to assertAll.

The assertAll method takes a heading string and a lambda containing multiple assertions grouped together.

2fill in blank

medium

Complete the code to group two assertions inside assertAll.

JUnit

assertAll("Check values", () -> { assertEquals(10, [1]); assertTrue(active); });

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

Atotal

Bvalue

Ccount

Dsum

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable that is not defined or unrelated.

Confusing variable names like total or count.

The variable sum is the one being checked for equality with 10.

3fill in blank

hard

Fix the error in the assertAll usage by completing the blank.

JUnit

assertAll("Multiple checks", () -> { assertEquals(3, list.size()); [1] });

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AassertTrue(list.contains('item'))

BassertTrue(list.contains(item))

CassertTrue(list.contains("item"))

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for strings which is invalid in Java.

Using undefined variable item without quotes.

The assertion must check if the list contains the string "item" using double quotes.

4fill in blank

hard

Fill both blanks to correctly group two assertions with assertAll.

JUnit

assertAll("Group assertions", () -> { [1]; [2]; });

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

AassertEquals(4, result)

BassertTrue(isValid)

CassertFalse(isEmpty)

DassertNull(value)

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing assertFalse or assertNull where assertTrue is expected.

Using assertions that do not match the test intent.

The first blank is an equality check, the second blank checks a boolean condition.

5fill in blank

hard

Fill all three blanks to correctly write grouped assertions with assertAll.

JUnit

assertAll("Test all", () -> { [1]; [2]; [3]; });

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

AassertNotNull(obj)

BassertEquals(7, count)

CassertTrue(flag)

DassertFalse(error)

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertFalse instead of assertTrue for the flag.

Missing the not-null check for the object.

The grouped assertions check that the object is not null, count equals 7, and flag is true.