Added test for multimethod inheritance

lib/spack/spack/test/multimethod.py

@@ -107,3 +107,7 @@ def test_multimethod_with_base_class(mock_packages):
 
     pkg = spack.repo.get('multimethod@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

var/spack/repos/builtin.mock/packages/multimethod-inheritor/package.py

@@ -0,0 +1,13 @@
+# Copyright 2013-2018 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.pkg.builtin.mock.multimethod import Multimethod
+
+
+class MultimethodInheritor(Multimethod):
+    """This package is designed for use with Spack's multimethod test.
+       It has a bunch of test cases for the @when decorator that the
+       test uses.
+    """

var/spack/repos/builtin/packages/zlib/package.py

@@ -31,6 +31,10 @@ class Zlib(Package):
 
     patch('w_patch.patch', when="@1.2.11%cce")
 
+    @when('%pgi')
+    def patch(self):
+        print "patching"
+
     @property
     def libs(self):
         shared = '+shared' in self.spec