Make yaml be an optional dependency

This can go away when we have made a release with yaml in it, and its
staging filler.

1 files changed, 9 insertions, 6 deletions

diff --git a/morphlib/yamlparse_tests.py b/morphlib/yamlparse_tests.py
index cb658e15..f5c2569b 100644
--- a/morphlib/yamlparse_tests.py
+++ b/morphlib/yamlparse_tests.py
@@ -15,17 +15,20 @@
 
 import unittest
 
-try:
-    from collections import OrderedDict
-except ImportError:
-    from ordereddict import OrderedDict
-import yaml
-
+import morphlib
 import morphlib.yamlparse as yamlparse
+from morphlib.util import OrderedDict
+
+if morphlib.got_yaml:
+    yaml = morphlib.yaml
 
 
 class YAMLParseTests(unittest.TestCase):
 
+    def run(self, *args, **kwargs):
+        if morphlib.got_yaml:
+            return unittest.TestCase.run(self, *args, **kwargs)
+
     example_text = '''\
 name: foo
 kind: chunk