public static void assertDoesNotThrow(Action runnable) {
try {
runnable.run();
} catch (Exception instigatingException) {
throw new AssertionError("expected clause not to throw, but it did.", instigatingException);
}
}
@Nonnull
public static <TException extends Throwable> TException assertThrows(
Class<TException> expectedException, Action runnable) {
assert !expectedException.equals(AssertionError.class)
: "cant assert on assertion errors since thats how we fail a test!";
try {
runnable.run();
fail("expected action to throw " + expectedException.getSimpleName() + " but it did not.");
return null;
} catch (Throwable exception) {
if (!expectedException.isInstance(exception)) {
throw exception;
}
return expectedException.cast(exception);
}
}