@EnumSource for enum values in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use @EnumSource to run the test for all enum values.

JUnit

@ParameterizedTest
@EnumSource([1].class)
void testEnumValues([1] value) {
    assertNotNull(value);
}

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AString

Bint

CDay

DList

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-enum type in @EnumSource.

Forgetting to add .class after the enum name.

The @EnumSource annotation requires the enum class name. Here, 'Day' is the enum used for testing.

2fill in blank

medium

Complete the code to run the test only for the enum values MONDAY and FRIDAY.

JUnit

@ParameterizedTest
@EnumSource(value = Day.class, names = {"[1]", "FRIDAY"})
void testSelectedDays(Day day) {
    assertTrue(day == Day.MONDAY || day == Day.FRIDAY);
}

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ASUNDAY

BMONDAY

CTUESDAY

DWEDNESDAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or misspelled enum names in 'names'.

Not enclosing enum names in quotes.

The 'names' attribute specifies which enum constants to include. Here, MONDAY and FRIDAY are selected.

3fill in blank

hard

Fix the error in the code to exclude the enum value SUNDAY from the test.

JUnit

@ParameterizedTest
@EnumSource(value = Day.class, mode = EnumSource.Mode.EXCLUDE, names = {"[1]"})
void testExcludeSunday(Day day) {
    assertNotEquals(Day.SUNDAY, day);
}

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AFRIDAY

BMONDAY

CSATURDAY

DSUNDAY

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to set mode to EXCLUDE.

Listing wrong enum names to exclude.

To exclude SUNDAY, it must be listed in the 'names' attribute with EXCLUDE mode.

4fill in blank

hard

Fill both blanks to run the test only for enum values starting with 'TUES'.

JUnit

@ParameterizedTest
@EnumSource(value = Day.class, names = {"[1]"}, mode = EnumSource.Mode.INCLUDE)
void testDaysStartingWithTues(Day day) {
    assertTrue(day.name().startsWith("[2]"));
}

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ATUESDAY

BMONDAY

CTUES

DFRIDAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using partial enum names in 'names' attribute.

Mismatch between names and startsWith string.

The test includes only TUESDAY, and the assertion checks the name starts with 'TUES'.

5fill in blank

hard

Fill all three blanks to run the test for enum values MONDAY and FRIDAY and assert their ordinal values.

JUnit

@ParameterizedTest
@EnumSource(value = Day.class, names = {"[1]", "[2]"})
void testDayOrdinals(Day day) {
    int ordinal = day.ordinal();
    assertTrue(ordinal == [3] || ordinal == 5);
}

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AMONDAY

B0

C1

DFRIDAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong ordinal values for MONDAY or FRIDAY.

Mixing up enum names in the 'names' list.

The test runs for MONDAY and FRIDAY. MONDAY ordinal is 1, FRIDAY ordinal is 5 (assuming enum starts at 0 with SUNDAY).