Acid test and Test case

Acid test noun - A rigorous or crucial appraisal.

Test case and acid test are semantically related In some cases you can replace phrase "Test case" with "Acid test", this phrases are similar.

Test case noun - A representative legal action whose outcome is likely to become a precedent.

Acid test and test case are semantically related in representative occurrence topic. You can use "Acid test" instead a noun phrase "Test case".