Generating Tests

Lemon can also be used to generate test scaffolding for pre-existing code. For example:

    $ lemon -g -a -n HelloWorld lib/hello_world.rb

The -a (or --all) option tells Lemon to generate test code for all classes and modules in the system (as opposed to classes and modules with testcases already started). Obviously we don’t actually want a test for every method of every class or module, so we use the -n (or --namespace) filter option to focus on the class of interest.

Generated tests can also be limited to just the units not yet covered by eliminating the -a option and passing in pre-existing test scripts instead.

    $ lemon -g test/case_hello_world.rb

Notice we no longer need to use the -n filter either since our test case is being used as the limiting factor.