Ruby Blocks
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Blocks allow passing anonymous functions to methods like Array#each. A performance monitor records time before and after running code to report the time difference. To test code that depends on time, test doubles like stubs can replace dependencies and return hardcoded values to make tests repeatable and isolated from external factors like changing time. Stubs in RSpec allow stubbing methods to return specific values or blocks.
Ruby Blocks
- 1. Ruby BlocksTest Driven Performance Monitorwith Stubs
- 2. BlocksA block is an anonymous function. my_array.each do |value| do_something(value)end
- 3. Performance Monitor Example How it works:Record TimeRun CodeReport Time DifferenceHmmm… how do we test when time is always changing?
- 4. A Test Double replaces the "real" instance of an object used by the production code with something suitable for the currently running test, but with the same interfaceStubsHard-coded valuesMocksPre-programmed with expectationsFail-fastTest Doubles in general are often called Mock Objects, so be careful about terminologyFakesCan store values across calls, but don't really do what the live object would doE.g. in-memory databaseTest Doubles
- 5. How to Test Code with DependenciesExample from The Rspec Book by David Chelimsky
- 6. Isolating the SubjectExample from The Rspec Book by David Chelimsky
- 9. Stub for Specific Valuesmy_obj.stub!(:msg).with(1).and_return(2)
- 10. Stub in RSpecmy_obj.stub!(:msg).and_return { ... }