Mocks and stubs in Test::Unit when you are used to RSpec

We are maintaining some vintage projects with tests written in Test::Unit instead of RSpec. Mocks and stubs are not features of Test::Unit, but you can use the Mocha Show archive.org snapshot gem to add those facilities.

The following is a quick crash course to using mocks and stubs in Mocha, written for RSpec users:

|---------------------------------------------------------|
| RSpec | Mocha |
|---------------------------------------------------------|
| obj = double() | obj = mock() |
| obj.stub(:method => 'value') | obj.stubs(:method).returns('value') |
| obj.should_receive(:method).with('argument').and_return('value') | obj.expects(:method).with('argument').returns('value') |
| obj.should_not_receive(:method) | obj.expects(:method).never |
| obj.should_receive(:method).once | obj.expects(:method).once |
| obj.should_receive(:method).with('argument', anything) | obj.expects(:method).with('argument', anything) |
| obj.should_receive(:method).with(hash_including(:key => 'value')) | obj.expects(:method).with(has_entries(:key => 'value')) |
|---------------------------------------------------------|