tests: fully parametrize multimethod test

- all multimethod tests are now run for both `multimethod` and
  `multimethod-inheritor`

- do this with a parameterized fixture (pkg_name) that runs the same
  tests on both

lib/spack/spack/test/multimethod.py

@@ -10,69 +10,83 @@
 from spack.multimethod import NoSuchMethodError
 
 
-def test_no_version_match(mock_packages):
+pytestmark = pytest.mark.usefixtures('mock_packages')
-    pkg = spack.repo.get('multimethod@2.0')
+
+
+@pytest.fixture(scope='module',
+                params=['multimethod', 'multimethod-inheritor'])
+def pkg_name(request):
+    """Make tests run on both multimethod and multimethod-inheritor.
+
+    This means we test all of our @when methods on a class that uses them
+    directly, AND on a class that inherits them.
+    """
+    return request.param
+
+
+def test_no_version_match(pkg_name):
+    pkg = spack.repo.get(pkg_name + '@2.0')
     with pytest.raises(NoSuchMethodError):
         pkg.no_version_2()
 
 
-def test_one_version_match(mock_packages):
+def test_one_version_match(pkg_name):
-    pkg = spack.repo.get('multimethod@1.0')
+    pkg = spack.repo.get(pkg_name + '@1.0')
     assert pkg.no_version_2() == 1
 
-    pkg = spack.repo.get('multimethod@3.0')
+    pkg = spack.repo.get(pkg_name + '@3.0')
     assert pkg.no_version_2() == 3
 
-    pkg = spack.repo.get('multimethod@4.0')
+    pkg = spack.repo.get(pkg_name + '@4.0')
     assert pkg.no_version_2() == 4
 
 
-def test_version_overlap(mock_packages):
+def test_version_overlap(pkg_name):
-    pkg = spack.repo.get('multimethod@2.0')
+    pkg = spack.repo.get(pkg_name + '@2.0')
     assert pkg.version_overlap() == 1
 
-    pkg = spack.repo.get('multimethod@5.0')
+    pkg = spack.repo.get(pkg_name + '@5.0')
     assert pkg.version_overlap() == 2
 
 
-def test_mpi_version(mock_packages):
+def test_mpi_version(pkg_name):
-    pkg = spack.repo.get('multimethod^mpich@3.0.4')
+    pkg = spack.repo.get(pkg_name + '^mpich@3.0.4')
     assert pkg.mpi_version() == 3
 
-    pkg = spack.repo.get('multimethod^mpich2@1.2')
+    pkg = spack.repo.get(pkg_name + '^mpich2@1.2')
     assert pkg.mpi_version() == 2
 
-    pkg = spack.repo.get('multimethod^mpich@1.0')
+    pkg = spack.repo.get(pkg_name + '^mpich@1.0')
     assert pkg.mpi_version() == 1
 
 
-def test_undefined_mpi_version(mock_packages):
+def test_undefined_mpi_version(pkg_name):
-    pkg = spack.repo.get('multimethod^mpich@0.4')
+    pkg = spack.repo.get(pkg_name + '^mpich@0.4')
     assert pkg.mpi_version() == 1
 
-    pkg = spack.repo.get('multimethod^mpich@1.4')
+    pkg = spack.repo.get(pkg_name + '^mpich@1.4')
     assert pkg.mpi_version() == 1
 
 
-def test_default_works(mock_packages):
+def test_default_works(pkg_name):
-    pkg = spack.repo.get('multimethod%gcc')
+    pkg = spack.repo.get(pkg_name + '%gcc')
     assert pkg.has_a_default() == 'gcc'
 
-    pkg = spack.repo.get('multimethod%intel')
+    pkg = spack.repo.get(pkg_name + '%intel')
     assert pkg.has_a_default() == 'intel'
 
-    pkg = spack.repo.get('multimethod%pgi')
+    pkg = spack.repo.get(pkg_name + '%pgi')
     assert pkg.has_a_default() == 'default'
 
 
-def test_target_match(mock_packages):
+def test_target_match(pkg_name):
     platform = spack.architecture.platform()
     targets = list(platform.targets.values())
     for target in targets[:-1]:
-        pkg = spack.repo.get('multimethod target=' + target.name)
+        pkg = spack.repo.get(pkg_name + ' target=' + target.name)
         assert pkg.different_by_target() == target.name
 
-    pkg = spack.repo.get('multimethod target=' + targets[-1].name)
+    pkg = spack.repo.get(pkg_name + ' target=' + targets[-1].name)
     if len(targets) == 1:
         assert pkg.different_by_target() == targets[-1].name
     else:
@@ -80,34 +94,30 @@ def test_target_match(mock_packages):
             pkg.different_by_target()
 
 
-def test_dependency_match(mock_packages):
+def test_dependency_match(pkg_name):
-    pkg = spack.repo.get('multimethod^zmpi')
+    pkg = spack.repo.get(pkg_name + '^zmpi')
     assert pkg.different_by_dep() == 'zmpi'
 
-    pkg = spack.repo.get('multimethod^mpich')
+    pkg = spack.repo.get(pkg_name + '^mpich')
     assert pkg.different_by_dep() == 'mpich'
 
     # If we try to switch on some entirely different dep, it's ambiguous,
     # but should take the first option
-    pkg = spack.repo.get('multimethod^foobar')
+    pkg = spack.repo.get(pkg_name + '^foobar')
     assert pkg.different_by_dep() == 'mpich'
 
 
-def test_virtual_dep_match(mock_packages):
+def test_virtual_dep_match(pkg_name):
-    pkg = spack.repo.get('multimethod^mpich2')
+    pkg = spack.repo.get(pkg_name + '^mpich2')
     assert pkg.different_by_virtual_dep() == 2
 
-    pkg = spack.repo.get('multimethod^mpich@1.0')
+    pkg = spack.repo.get(pkg_name + '^mpich@1.0')
     assert pkg.different_by_virtual_dep() == 1
 
 
-def test_multimethod_with_base_class(mock_packages):
+def test_multimethod_with_base_class(pkg_name):
-    pkg = spack.repo.get('multimethod@3')
+    pkg = spack.repo.get(pkg_name + '@3')
     assert pkg.base_method() == "subclass_method"
 
-    pkg = spack.repo.get('multimethod@1')
+    pkg = spack.repo.get(pkg_name + '@1')
     assert pkg.base_method() == "base_method"
-
-def test_multimethod_inheritance(mock_packages):
-    pkg = spack.repo.get('multimethod-inheritor@1.0')
-    assert pkg.no_version_2() == 1