Add checkstyle rule to ensure AssertJ assertions always check for underlying exception message

[nastra]

Feature Request / Improvement

We should ensure that test code asserting on exceptions should always check for the underlying exception message as shown below:

// should fail because it doesn't check for the underlying message
Assertions.assertThatThrownBy(() -> ...)
        .isInstanceOf(ValidationException.class);

// should not fail as it checks for the exception message
Assertions.assertThatThrownBy(() -> ...)
        .isInstanceOf(ValidationException.class)
        .hasMessageContaining(...);

// should fail because it doesn't check for the underlying message
Assertions.assertThatExceptionOfType(NotFoundException.class)
        .isThrownBy(() -> ...);

// should not fail as it checks for the exception message
Assertions.assertThatExceptionOfType(NotFoundException.class)
        .isThrownBy(() -> ...)
        .withMessageContaining(...);

Query engine

None

[tobehardest]

Can you assign this task to me?

[nastra]

thanks for taking this @tobehardest

[tobehardest]

I'm a newbie and I'm having some trouble figuring this out, maybe I need some help.

[coded9]

@tobehardest we can work together, if you are finding it difficult.

[tobehardest]

@tobehardest we can work together, if you are finding it difficult.

OK. How to contact you?

[coded9]

Are you on iceberg slack channel ?

[tobehardest]

Yes, I am on.

[tobehardest]

My name inside is, Yikun Chen.

[github-actions]

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