Marc Philipp

@marcphilipp.de

157 Followers 104 Following

Software engineer and @junit.org team lead, Java Champion and open source enthusiast, father, husband & family person (he/him) Website: https://marcphilipp.de Mastodon: https://chaos.social/@marcphilipp

object ImprovedKotlinSupportTests {

val data = sequenceOf( // Sequence<T> support
arguments(1, Month.JANUARY),
arguments(12, Month.DECEMBER)
)

@ParameterizedTest
@FieldSource("data")
// suspending function support for coroutine testing
suspend fun test(value: Int, month: Month?) {
assertNotNull(month) // contracts to support...
assertEquals(value, month.value) // smart casts!
}
}

@Test // Java
int test() {
return 42;
} // Not executed!!! 😱😱😱

@ParameterizedClass
@ValueSource(strings = {"foo", "bar"})
class SomeTests {
@Parameter String value;

@Test
void shouldNotBeNull() {
assertNotNull(value);
}
@Test
void lengthShouldBeThree() {
assertEquals(3, value.length());
}
}

screenshot of GitHub Actions workflow chart

Promotional image for "Catching up with JUnit 5" workshop by Marc Philipp and Christian Stein at JCON 2025 featuring their avatars and a bunch of logos.