On Tue, 2 Mar 2021 18:07:24 GMT, Stuart Marks <[email protected]> wrote:
>> test/jdk/jdk/internal/util/ArraysSupport/NewLength.java line 100:
>>
>>> 98: int r = ArraysSupport.newLength(old, min, pref);
>>> 99: fail("expected OutOfMemoryError, got normal return value of
>>> " + r);
>>> 100: } catch (OutOfMemoryError success) { }
>>
>> Consider using `expectThrows` or `assertThrows` from `org.testng.Assert`.
>
> Good point. However, I actually tried to use assertThrows, but there doesn't
> seem to be a way to get the unexpected return value into the error message. I
> think having this value in the test output is important for diagnosing
> failures.
That tradeoff you made, makes sense.
Indeed, neither `assertThrows` nor `expectThrows` in `org.testng.Assert` logs
an unexpectedly returned value. This is because the code being tested is
expressed as the `Assert.ThrowingRunnable` interface which has a single `void`
method. So the code being tested cannot return a value to the testing framework.
Now, if `org.testng.Assert` were to provide the respective methods accepting,
say, `Assert.ThrowingCallable` that had a value-returning method, TestNG would
run into the same issues that JUnit ran into when they attempted to do that:
https://github.com/junit-team/junit5/issues/1576
-------------
PR: https://git.openjdk.java.net/jdk/pull/1617
