Add test for YAML specs.

lib/spack/spack/test/__init__.py

@@ -52,7 +52,8 @@
               'mirror',
               'url_extrapolate',
               'cc',
-              'link_tree']
+              'link_tree',
+              'spec_yaml']
 
 
 def list_tests():

lib/spack/spack/test/spec_yaml.py

@@ -0,0 +1,65 @@
+##############################################################################
+# Copyright (c) 2013-2015, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://scalability-llnl.github.io/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License (as published by
+# the Free Software Foundation) version 2.1 dated February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+"""Test YAML serialization for specs.
+
+YAML format preserves DAG informatoin in the spec.
+
+"""
+from spack.spec import Spec
+from spack.test.mock_packages_test import *
+
+class SpecDagTest(MockPackagesTest):
+
+    def check_yaml_round_trip(self, spec):
+        yaml_text = spec.to_yaml()
+        spec_from_yaml = Spec.from_yaml(yaml_text)
+        self.assertTrue(spec.eq_dag(spec_from_yaml))
+
+
+    def test_simple_spec(self):
+        spec = Spec('mpileaks')
+        self.check_yaml_round_trip(spec)
+
+
+    def test_normal_spec(self):
+        spec = Spec('mpileaks+debug~opt')
+        spec.normalize()
+        self.check_yaml_round_trip(spec)
+
+
+    def test_concrete_spec(self):
+        spec = Spec('mpileaks+debug~opt')
+        spec.concretize()
+        self.check_yaml_round_trip(spec)
+
+
+    def test_yaml_subdag(self):
+        spec = Spec('mpileaks^mpich+debug~opt')
+        spec.concretize()
+
+        yaml_spec = Spec.from_yaml(spec.to_yaml())
+
+        for dep in ('callpath', 'mpich', 'dyninst', 'libdwarf', 'libelf'):
+            self.assertTrue(spec[dep].eq_dag(yaml_spec[dep]))