Mock Expectations
A mock object retains the basic idea of the stubâreturning a specified value without actually calling a live methodâand adds the requirement that the specified method must be called during the test. In other words, a mock is like a stub with attitude, expectingânay, demandingâthat its parameters be matched in the test or else we get a test failure.
In RSpec you use the expect method to create mock expectations. This can be applied to full or partial doubles:
| â | it â"expects stuff"â âdoâ |
| â | mocky = double(â"Mock"â) |
| â | expect(mocky).to receive(:name).and_return(â"Paul"â) |
| â | expect(mocky).to receive(:weight).and_return(100) |
| â | expect(mocky.name).to eq(â"Paul"â) |
| â | âendâ |
This test fails: ...
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