@CsvSource for inline CSV data in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use @CsvSource with two values.

JUnit

@ParameterizedTest
@CsvSource([1])
void testSum(int a, int b) {
    assertEquals(a + b, a + b);
}

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

A"1; 2"

B"1, 2"

C"1|2"

D"1 2"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolons or other separators instead of commas.

Not putting the CSV line inside quotes.

The @CsvSource expects comma-separated values inside quotes for each line.

2fill in blank

medium

Complete the code to add multiple CSV lines in @CsvSource.

JUnit

@ParameterizedTest
@CsvSource([1])
void testMultiply(int a, int b, int expected) {
    assertEquals(expected, a * b);
}

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

A"1 2 2", "3 4 12"

B"1; 2; 2", "3; 4; 12"

C"1|2|2", "3|4|12"

D"1, 2, 2", "3, 4, 12"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolons or pipes instead of commas inside lines.

Not separating lines with commas.

Multiple CSV lines are separated by commas and each line is a quoted string with comma-separated values.

3fill in blank

hard

Fix the error in the @CsvSource annotation to correctly pass three test cases.

JUnit

@ParameterizedTest
@CsvSource([1])
void testConcat(String a, String b, String expected) {
    assertEquals(expected, a + b);
}

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

A"Hello|World|HelloWorld", "Java|Test|JavaTest", "JUnit|5|JUnit5"

B"Hello; World; HelloWorld", "Java; Test; JavaTest", "JUnit; 5; JUnit5"

C"Hello, World, HelloWorld", "Java, Test, JavaTest", "JUnit, 5, JUnit5"

D"Hello World HelloWorld", "Java Test JavaTest", "JUnit 5 JUnit5"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolons or pipes instead of commas inside the CSV lines.

Not separating lines with commas.

The correct CSV format uses commas inside quotes to separate values and commas between lines.

4fill in blank

hard

Fill both blanks to correctly use @CsvSource with mixed data types.

JUnit

@ParameterizedTest
@CsvSource([1])
void testMixedTypes(int id, String name, boolean active) {
    assertTrue(active);
    assertNotNull(name);
    assertTrue(id > 0);
}

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

A"1, Alice, true", "2, Bob, true"

B"1, Alice, true", "2, Bob, false"

C"1; Alice; true", "2; Bob; false"

D"1|Alice|true", "2|Bob|true"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolons or pipes instead of commas.

Including false where the test expects true.

Each CSV line must be a quoted string with comma-separated values. The test expects 'active' to be true, so lines with false would fail.

5fill in blank

hard

Fill all three blanks to create a @CsvSource with three test cases and correct syntax.

JUnit

@ParameterizedTest
@CsvSource([1])
void testDivide(int numerator, int denominator, int expected) {
    assertEquals(expected, numerator / denominator);
}

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

A"10, 2, 5"

B"20, 4, 5"

C"30, 5, 6"

D"10; 2; 5"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolons inside the CSV lines.

Not separating lines with commas.

Each CSV line is a quoted string with comma-separated values. Lines are separated by commas outside the quotes.