Assertion of Particular Exception which contains a field

Question

Currently I have a test which tries to check a particular exception which looks like this:

assertThatExceptionOfType(DataIntegrityViolationException.class).isThrownBy(
        () -> xrepo.save(abc))
    .withCauseExactlyInstanceOf(ConstraintViolationException.class);

The exception ConstraintViolationException has a field constraintName available via getter getConstraintName() but I haven't found a way to check that via assertj.

I could imagine something like the following:

assertThatExceptionOfType(DataIntegrityViolationException.class).isThrownBy(
        () -> xrepo.save(abc))
    .withCauseExactlyInstanceOf(ConstraintViolationException.class)
    .with("getConstraintName").isEqualTo("XXXX");

or is there a different way to accomplish this?

score 3 · Answer 1 · answered Sep 16 '21 at 15:35

withCauseExactlyInstanceOf does not change the object under test, but with havingCause() further assertions can be performed on the cause.

Combined with asInstanceOf() and returns(), a type-safe check would be:

assertThatExceptionOfType(DataIntegrityViolationException.class).isThrownBy(
        () -> xrepo.save(abc))
    .havingCause()
    .asInstanceOf(type(ConstraintViolationException.class))
    .returns("XXXX", from(ConstraintViolationException::getConstraintName));

Or without type safety, using isInstanceOf and hasFieldOrPropertyWithValue:

assertThatExceptionOfType(DataIntegrityViolationException.class).isThrownBy(
        () -> xrepo.save(abc))
    .havingCause()
    .isInstanceOf(ConstraintViolationException.class)
    .hasFieldOrPropertyWithValue("getConstraintName", "XXX")

score 2 · Accepted Answer · answered Sep 16 '21 at 15:18

2

May be:

.extracting(x -> ((ConstraintViolationException)x).getConstraintName())
.isEqualTo("XXXX");

answered Sep 16 '21 at 15:18

Eugene

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Thanks for your help. – khmarbaise Sep 16 '21 at 15:51
I was expecting something like `.map(e -> e.getField())` so I didn't find this method, thanks! – Ferran Maylinch Jul 24 '23 at 13:10

score 0 · Answer 3 · answered Sep 16 '21 at 15:50

0

The solution of @Eugene brought me to the direction:

assertThatExceptionOfType(DataIntegrityViolationException.class).isThrownBy(
        () -> xyrepository.save(xxx))
    .withCauseExactlyInstanceOf(ConstraintViolationException.class)
    .extracting(s -> ((ConstraintViolationException) (s.getCause())).getConstraintName())
    .isEqualTo("XXXX");

The solution of @StefanoCordio looks also fine...

answered Sep 16 '21 at 15:50

khmarbaise

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Thanks for your help... – khmarbaise Sep 16 '21 at 15:51

Assertion of Particular Exception which contains a field

3 Answers3