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Marc Philipp

@marcphilipp.de

161 followers 106 following 36 posts

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

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Marc Philipp @marcphilipp.de · 21/08/2025

✨ New blog post: "STF Milestone 6: Improved Kotlin support" #JUnit 6.0.0-RC1 improves JUnit's #Kotlin story by adding support for suspending functions, sequences, contracts and nullness annotations. 👉 marcphilipp.de/blog/2025/08... Thanks to the @sovereign.tech fund for their support!

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!
}
}

074

Marc Philipp @marcphilipp.de · 16/08/2025

✨ New blog post: "STF Milestone 5: Discovery issues" Ever written a test that wasn't being executed? 😱 #JUnit 5.13 introduced a mechanism for reporting such issues found during test discovery. 👉 marcphilipp.de/blog/2025/08... Thanks to the @sovereign.tech fund for their support!

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

0145

Marc Philipp @marcphilipp.de · 07/06/2025

✨ New blog post: "STF Milestone 4: Parameterized test classes" JUnit 5.13 introduced parameterized test classes (in addition to methods). They are a powerful testing tool that has long been missing from JUnit Jupiter... 👉 marcphilipp.de/blog/2025/06...

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

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

03011

Marc Philipp @marcphilipp.de · 01/04/2025

✨ New blog post: "STF Milestone 3: Release verification and automation" A major goal of the Sovereign Tech Fund is to help projects become more sustainable. For #JUnit, one activity in desperate need of improvement in this area was performing a release. marcphilipp.de/blog/2025/04...

screenshot of GitHub Actions workflow chart

011

Marc Philipp @marcphilipp.de · 25/03/2025

Together with @sormuras@mastodon.cloud, I will be hosting a workshop at @jcon@mastodon.social in Cologne on May 12. As you might have guessed, it's about "Catching up with #JUnit 5". See you there? schedule.jcon.one/session/837895 (1/2)

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.

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