1 files changed, 36 insertions, 0 deletions
diff --git a/src/engine/SCons/Sig/SigTests.py b/src/engine/SCons/Sig/SigTests.py
index c82d2c5..f297464 100644
--- a/src/engine/SCons/Sig/SigTests.py
+++ b/src/engine/SCons/Sig/SigTests.py
@@ -490,6 +490,41 @@ class SConsignDirFileTestCase(unittest.TestCase):
         assert f.get('foo') == (3, 1, 2)
         assert f.get_implicit('foo') == ['bar']
 
+class SConsignFileTestCase(unittest.TestCase):
+
+    def runTest(self):
+        test = TestCmd.TestCmd(workdir = '')
+        file = test.workpath('sconsign_file')
+
+        assert SCons.Sig.SConsign_db is None, SCons.Sig.SConsign_db
+
+        SCons.Sig.SConsignFile(file)
+
+        assert not SCons.Sig.SConsign_db is None, SCons.Sig.SConsign_db
+
+        class Fake_DBM:
+            def open(self, name, mode):
+                self.name = name
+                self.mode = mode
+                return self
+
+        fake_dbm = Fake_DBM()
+
+        SCons.Sig.SConsignFile(file, fake_dbm)
+
+        assert not SCons.Sig.SConsign_db is None, SCons.Sig.SConsign_db
+        assert not hasattr(fake_dbm, 'name'), fake_dbm
+        assert not hasattr(fake_dbm, 'mode'), fake_dbm
+
+        SCons.Sig.SConsign_db = None
+
+        SCons.Sig.SConsignFile(file, fake_dbm)
+
+        assert not SCons.Sig.SConsign_db is None, SCons.Sig.SConsign_db
+        assert fake_dbm.name == file, fake_dbm.name
+        assert fake_dbm.mode == "c", fake_dbm.mode
+
+
 
 def suite():
     suite = unittest.TestSuite()
@@ -500,6 +535,7 @@ def suite():
     suite.addTest(_SConsignTestCase())
     suite.addTest(SConsignDBTestCase())
     suite.addTest(SConsignDirFileTestCase())
+    suite.addTest(SConsignFileTestCase())
     return suite
 
 if __name__ == "__main__":