What is the meaning of 'test case'?

[Lusen]

Test No. incompl/inter-59 "Testing, Testing", question 4

No-one knows whether he'll succeed in his attempt to get compensation as it's a bit of a test ..........

(a) theme
(b) process
(c) case
(d) example

Test No. incompl/inter-59 "Testing, Testing", answer 4

No-one knows whether he'll succeed in his attempt to get compensation as it's a bit of a test case.

Correct answer: (c) case

Your answer was: correct
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What does 'test case' mean?

Lusen

[Alan]

This is a legal process to see what happens in the court.
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English as a Second Language
You can read my ESL story Phrasal Verbs/run

[Thunu]

Dear Teachers

Can you explain this sentence easier for me to understand?

Thank you

Thu
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Reach an agreement as ploughing, don't let argument happen at crops.