minitest-mock
minitest/mock, by Steven Baker, is a beautifully tiny mock (and stub) object framework. The minitest-mock gem is an extraction of minitest/mock.rb from minitest in order to make it easier to maintain independent of minitest.
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Docs
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Zeitwerk
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Optimized
Getting Started
Learn more about the Minitest-mock gem.
Playground
Test, play and inspect the gem for yourself