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Scala: assertThrows in Junit5 and hand-rolled
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| def throwingFunction(): Unit = throw RuntimeError() | |
| // own implementation of assertThrows | |
| def assertThrows[E](f: => Unit)(implicit eType:ClassTag[E]): Unit = | |
| try f | |
| catch | |
| case _: E => return | |
| case e: Any => Assertions.fail(s"Expected ${eType.runtimeClass.getName} got ${e.getClass}") | |
| Assertions.fail(s"Expected ${eType.runtimeClass.getName}") | |
| // usage: | |
| assertThrows[RuntimeError](throwingFunction()) | |
| // import assertThrows from jupiter/JUnit5 | |
| import org.junit.jupiter.api.Assertions | |
| // usage: | |
| Assertions.assertThrows(classOf[RuntimeError], () => throwingFunction()) |
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tbh I like my implementation better, but if you are able to use JUnit5, it is preferable to use the library function.
JUnit4 does not offer an
assertThrows, so you may have to use the own implementation.