If the classpath does not contain OpenTest4J (e.g. you use JUnit 4 instead of JUnit 5) AssertJ 3.13.0 fails with:
java.lang.NoClassDefFoundError: org/opentest4j/MultipleFailuresError
A sample project to reproduce this issue: https://github.com/PascalSchumacher/assertj-3.13.0-requires-junit5-bug
If the classpath does not contain OpenTest4J (e.g. you use JUnit 4 instead of JUnit 5) AssertJ
3.13.0fails with:java.lang.NoClassDefFoundError: org/opentest4j/MultipleFailuresErrorA sample project to reproduce this issue: https://github.com/PascalSchumacher/assertj-3.13.0-requires-junit5-bug