java - Our project contains 2600 class files - where and how should we start writing junit tests? -

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java - Our project contains 2600 class files - where and how should we start writing junit tests? -

our project contains 2600 class files , have decided start using automated tests.

we know have should have started 2599 class files ago, how , should big projects start write tests?

pick random class , go?

what's of import know? there tools use?

write unit test before alter something, , every bug encounter.

in other words, test functionality working on. otherwise, going take lot of time , effort write tests classes.

java unit-testing junit

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