Allow to add test in a project to check if our rules are really applied

[pkernevez]

I don't find an information on how to do it.

I tried Stack Overflow too, without success.

We have about 40 rules on our base code and I want to check automatically that the rules are still validating what is expected.

[hankem]

Essentially as suggested by Larry Diamond's Stack Overflow answer:
To ensure that a rule catches a certain violation, you should have a unit test evaluate the rule with an intentional violation (which can be defined in a local test scope, cf. #930 (comment)), and assert that the expected failure is obtained.

GeneralCodingRulesTest and LayeredArchitectureTest are two examples for ArchUnit's own unit tests for rules.
They use ArchRuleAssertion and ArchRuleCheckAssertion, which are currently (as of ArchUnit 1.3.0) not provided by ArchUnit, but are straight forward implementations.