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Starting from the following generic code, showing a sample test class that needs to be executed for several rounds of input data:

import java.util.stream.Stream;
import org.junit.jupiter.api.*;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class DummyManyTests {

    @BeforeAll
    public void beforeAll() {
        log.info("before all...");
    }

    @AfterAll
    public void afterAll() {
        log.info("after all...");
    }

    static Stream<Integer> countParameterProvider() {
        return Stream.of(50, 100, 200);
    }

    @ParameterizedTest
    @MethodSource("countParameterProvider")
    @Order(10)
    public void m1(int count) {
        log.info("m1 #count: {}", count);
    }

    @ParameterizedTest
    @MethodSource("countParameterProvider")
    @Order(20)
    public void m2(int count) {
        log.info("m2 #count: {}", count);
    }

    @ParameterizedTest
    @MethodSource("countParameterProvider")
    @Order(30)
    public void m3(int count) {
        log.info("m3 #count: {}", count);
    }

}

Which generates this output:

15:38:54.878 [main] INFO com...DummyManyTests - before all...
15:38:54.973 [main] INFO com...DummyManyTests - m1 #count: 50
15:38:55.004 [main] INFO com...DummyManyTests - m1 #count: 100
15:38:55.007 [main] INFO com...DummyManyTests - m1 #count: 200
15:38:55.013 [main] INFO com...DummyManyTests - m2 #count: 50
15:38:55.015 [main] INFO com...DummyManyTests - m2 #count: 100
15:38:55.018 [main] INFO com...DummyManyTests - m2 #count: 200
15:38:55.021 [main] INFO com...DummyManyTests - m3 #count: 50
15:38:55.025 [main] INFO com...DummyManyTests - m3 #count: 100
15:38:55.028 [main] INFO com...DummyManyTests - m3 #count: 200
15:38:55.030 [main] INFO com...DummyManyTests - after all...

I need to change the way the tests are parameterized.
Basically I need to have the entire entire class executed end-to-end (including beforeAll and afterAll), for each value of that parameter.

The output would then become:

15:38:54.878 [main] INFO com...DummyManyTests - before all...
15:38:54.973 [main] INFO com...DummyManyTests - m1 #count: 50
15:38:55.013 [main] INFO com...DummyManyTests - m2 #count: 50
15:38:55.021 [main] INFO com...DummyManyTests - m3 #count: 50
15:38:55.030 [main] INFO com...DummyManyTests - after all...
15:38:54.878 [main] INFO com...DummyManyTests - before all...
15:38:55.004 [main] INFO com...DummyManyTests - m1 #count: 100
15:38:55.015 [main] INFO com...DummyManyTests - m2 #count: 100
15:38:55.025 [main] INFO com...DummyManyTests - m3 #count: 100
15:38:55.030 [main] INFO com...DummyManyTests - after all...
15:38:54.878 [main] INFO com...DummyManyTests - before all...
15:38:55.007 [main] INFO com...DummyManyTests - m1 #count: 200
15:38:55.018 [main] INFO com...DummyManyTests - m2 #count: 200
15:38:55.028 [main] INFO com...DummyManyTests - m3 #count: 200
15:38:55.030 [main] INFO com...DummyManyTests - after all...

How can I achieve this ?

Improve this question
6
  • 1
    There's no way to parametrize class See this answer: stackoverflow.com/questions/46182118/… Commented Jan 16, 2024 at 14:58
  • 1
    I've done what's suggested in stackoverflow.com/a/77008774/1180351 a few times, works pretty well Commented Jan 16, 2024 at 16:54
  • Deriving from a superclass or interface is the only supported way to parameterized a full test suite. If that‘s suitable for your case depends on how many variations you have. Half a dozen is probably still reasonable. A few hundred subclasses probably not. Commented Jan 16, 2024 at 19:04
  • @RobSpoor that seems to be the closest thing to what I need, at least from what I could find so far... Commented Jan 17, 2024 at 9:09
  • 1
    @johanneslink if you have that many, or need dynamic parameterization, you can always go for @TestFactory and DynamicContainer. Whenever I need to do that, I usually create a private method for creating each nested DynamicContainer and DynamicTest so the code won't become unreadable. Commented Jan 17, 2024 at 9:41
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