1 files changed, 3 insertions, 1 deletions
diff --git a/src/engine/SCons/Tool/ToolTests.py b/src/engine/SCons/Tool/ToolTests.py
index adcd40a..723ae56 100644
--- a/src/engine/SCons/Tool/ToolTests.py
+++ b/src/engine/SCons/Tool/ToolTests.py
@@ -45,8 +45,10 @@ class ToolTestCase(unittest.TestCase):
                 return self.dict[key]
             def __setitem__(self, key, val):
                 self.dict[key] = val
+            def __contains__(self, key):
+                return self.dict.__contains__(key)
             def has_key(self, key):
-                return self.dict.has_key(key)
+                return key in self.dict
         env = Environment()
         env['BUILDERS'] = {}
         env['ENV'] = {}