Passing arguments explicitly
============================

In most of the examples here, we set up `sys.argv`.  In normal usage,
the testrunner just uses `sys.argv`.  It is possible to pass arguments
explicitly.

    >>> import os.path
    >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
    >>> defaults = [
    ...     '--path', directory_with_tests,
    ...     '--tests-pattern', '^sampletestsf?$',
    ...     ]
    >>> from zope.testing import testrunner
    >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
    Running samplelayers.Layer111 tests:
      Set up samplelayers.Layerx in N.NNN seconds.
      Set up samplelayers.Layer1 in N.NNN seconds.
      Set up samplelayers.Layer11 in N.NNN seconds.
      Set up samplelayers.Layer111 in N.NNN seconds.
      Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
    Tearing down left over layers:
      Tear down samplelayers.Layer111 in N.NNN seconds.
      Tear down samplelayers.Layerx in N.NNN seconds.
      Tear down samplelayers.Layer11 in N.NNN seconds.
      Tear down samplelayers.Layer1 in N.NNN seconds.
    False

If options already have default values, then passing a different default will
override.

For example, --list-tests defaults to being turned off, but if we pass in a
different default, that one takes effect.

    >>> defaults = [
    ...     '--list-tests',
    ...     '--path', directory_with_tests,
    ...     '--tests-pattern', '^sampletestsf?$',
    ...     ]
    >>> from zope.testing import testrunner
    >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
    Listing samplelayers.Layer111 tests:
      test_x1 (sample1.sampletests.test111.TestA)
      test_y0 (sample1.sampletests.test111.TestA)
      test_z0 (sample1.sampletests.test111.TestA)
      test_x0 (sample1.sampletests.test111.TestB)
      test_y1 (sample1.sampletests.test111.TestB)
      test_z0 (sample1.sampletests.test111.TestB)
      test_1 (sample1.sampletests.test111.TestNotMuch)
      test_2 (sample1.sampletests.test111.TestNotMuch)
      test_3 (sample1.sampletests.test111.TestNotMuch)
      test_x0 (sample1.sampletests.test111)
      test_y0 (sample1.sampletests.test111)
      test_z1 (sample1.sampletests.test111)
      /home/benji/workspace/zope.testing/1/src/zope/testing/testrunner/testrunner-ex/sample1/sampletests/../../sampletestsl.txt
      test_x1 (sampletests.test111.TestA)
      test_y0 (sampletests.test111.TestA)
      test_z0 (sampletests.test111.TestA)
      test_x0 (sampletests.test111.TestB)
      test_y1 (sampletests.test111.TestB)
      test_z0 (sampletests.test111.TestB)
      test_1 (sampletests.test111.TestNotMuch)
      test_2 (sampletests.test111.TestNotMuch)
      test_3 (sampletests.test111.TestNotMuch)
      test_x0 (sampletests.test111)
      test_y0 (sampletests.test111)
      test_z1 (sampletests.test111)
      /home/benji/workspace/zope.testing/1/src/zope/testing/testrunner/testrunner-ex/sampletests/../sampletestsl.txt
    False