Finding and running tests

nose, by default, follows a few simple rules for test discovery.

• If it looks like a test, it's a test. Names of directories, modules, classes and functions are compared against the testMatch regular expression, and those that match are considered tests. Any class that is a unittest.TestCase subclass is also collected, so long as it is inside of a module that looks like a test.

• Directories that don't look like tests and aren't packages are not inspected.

• Packages are always inspected, but they are only collected if they look like tests. This means that you can include your tests inside of your packages (somepackage/tests) and nose will collect the tests without running package code inappropriately.

• When a project appears to have library and test code organized into separate directories, library directories are examined first.

• When nose imports a module, it adds that module's directory to sys.path; when the module is inside of a package, like package.module, it will be loaded as package.module and the directory of package will be added to sys.path.

• If an object defines a test attribute that does not evaluate to True, that object will not be collected, nor will any objects it contains.

Be aware that plugins and command line options can change any of those rules.

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