Principle: keep your tests of functionality separate from your tests of business rules.
Example: I have some code that provisions licenses (bundles of permissions) to entities. I should have one suite of tests that verifies that it is possible to provision arbitrary combinations of permissions correctly - that is, the functionality. The clients of my code should have tests that verify that they are choosing to provision the particular combinations they expect - that is, the business rules. My tests should not fail when the business decision of what permissions to grant to which entities gets changed.
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