Peter Marklund

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Mon Nov 01 2010 14:04:42 GMT+0000 (Coordinated Universal Time)

Ruby Testing: Avoid Stubbing Non-Existent Methods with Mocha

Mocks and stubs can be fragile and come back and bite you when they can get out of sync with your code. One way this can happen is that a method is renamed or you misspell the method name. To avoid this issue you can configure Mocha to disallow stubbing and mocking of non-existent methods. I've come up with two new methods for the cases where you are working with messages implemented with method_missing:

It is interesting to note that this extension of Mocha is possible because of its flexible and clever design. Mocha was recently updated to version 0.9.9. I am grateful to James Mead (Floehopper) for providing this excellent testing library.