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test guideline - Coggle Diagram
test guideline
action
don't call internal class
don't test simple getter
don't test simple delegation
assert
don't verify beyond spec (by mock)
don't verify instance equality
write reusable helpers
production
keep public interface
don't expose fields directly
don't use value field unless no mock needed
arrange
construct
use factory
mock
only mock interface
don't mock internal class
don't mock protected methods
don't mock delegating, mock underlying