[FIXED] Correcty parameterized test class fails in JUnit 5

Issue

I have problem about unit testing using JUnit 5, namely when I run test method with parameterized annotation it fails but everything is correct, I think. it is JUnit 5 code:

@Test
@ParameterizedTest
@MethodSource("data")
public void test(int e){
    System.out.println("e = " + e);
}

private static Stream data(){
    return Stream.of(
        Arguments.of(1),
        Arguments.of(2)
    );
}

and it fails:

, I have tried custom parameterize resolver but there comes up another error: it does not return passed value from data() function, but returns default value what is defined in resolveParameter() function in CustomParameterResolver class. How to solve this problem ?

Solution

You don't need @Test when using @ParameterizedTest as this will result in an additional execution of your test. This additional execution expects an int to be passed to the test but there is no resolver for this and hence the test fails with the exception you posted.

@ParameterizedTest
@MethodSource("data")
public void test(int e){
    System.out.println("e = " + e);
}

private static Stream data(){
    return Stream.of(
        Arguments.of(1),
        Arguments.of(2)
    );
}

Answered By - rieckpil