Allow substitution of messages as variables in other messages.

grit/node/io_unittest.py

Index: grit/node/io_unittest.py
diff --git a/grit/node/io_unittest.py b/grit/node/io_unittest.py
index 4048e960053ff912478e297c24c1382e40cc4241..6a7069b140d8a7bbeec78b68706410e9bb37d6ff 100644
--- a/grit/node/io_unittest.py
+++ b/grit/node/io_unittest.py
@@ -62,6 +62,7 @@ class FileNodeUnittest(unittest.TestCase):
       </grit>'''
     grd = grd_reader.Parse(StringIO.StringIO(xml),
                            util.PathFromRoot('grit/testdata'))
+    grd.SetOutputContext('en', {})
     grd.RunGatherers(recursive=True)
     self.VerifyCliquesContainEnglishAndFrenchAndNothingElse(grd.GetCliques())
 
@@ -108,6 +109,7 @@ class FileNodeUnittest(unittest.TestCase):
       </grit>'''
     grd = grd_reader.Parse(StringIO.StringIO(xml),
                            util.PathFromRoot('grit/testdata'))
+    grd.SetOutputContext('en', {})
     grd.RunGatherers(recursive=True)
     self.VerifyCliquesContainEnglishAndFrenchAndNothingElse(grd.GetCliques())
 
@@ -132,6 +134,7 @@ class FileNodeUnittest(unittest.TestCase):
       </grit>'''
     grd = grd_reader.Parse(StringIO.StringIO(xml),
                            util.PathFromRoot('grit/test/data'))
+    grd.SetOutputContext('en', {})
     grd.RunGatherers(recursive=True)
     outputs = grd.GetChildrenOfType(io.OutputNode)
     self.failUnless(outputs[0].SatisfiesOutputCondition())