diff --git a/GPy/testing/parameter_testing.py b/GPy/testing/parameter_testing.py
index 7972d77f..919920a9 100644
--- a/GPy/testing/parameter_testing.py
+++ b/GPy/testing/parameter_testing.py
@@ -32,7 +32,8 @@ class Test(unittest.TestCase):
         self.bgplvm = BayesianGPLVM(Gaussian(self.Y, variance=self.noise_variance), self.Q, self.X, self.X_variance, kernel=self.kern)
         self.bgplvm.ensure_default_constraints()
         self.bgplvm.tie_params("noise_variance|white_variance")
-
+        self.bgplvm.constrain_fixed("rbf_var")
+        
         self.parameter = Parameterized([
                                     Parameterized([
                                                 Param('X', self.X),
@@ -50,23 +51,24 @@ class Test(unittest.TestCase):
         self.parameter['.*variance'].constrain_positive()
         self.parameter['.*length'].constrain_positive()
         self.parameter.white.tie_to(self.parameter.noise)
+        self.parameter.rbf_var.constrain_fixed()
 
     def tearDown(self):
         pass
 
 
-    def testGrepParamNamesTest(self):
-        assert(self.bgplvm.grep_param_names('X_\d') == self.parameter.grep_param_names('X_\d'))
-        assert(self.bgplvm.grep_param_names('X_\d+_1') == self.parameter.grep_param_names('X_\d+_1'))
-        assert(self.bgplvm.grep_param_names('X_\d_1') == self.parameter.grep_param_names('X_\d_1'))
-        assert(self.bgplvm.grep_param_names('X_.+_1') == self.parameter.grep_param_names('X_.+_1'))
-        assert(self.bgplvm.grep_param_names('X_1_1') == self.parameter.grep_param_names('X_1_1'))
-        assert(self.bgplvm.grep_param_names('X') == self.parameter.grep_param_names('X'))
-        assert(self.bgplvm.grep_param_names('rbf') == self.parameter.grep_param_names('rbf'))
-        assert(self.bgplvm.grep_param_names('rbf_l.*_1') == self.parameter.grep_param_names('rbf_l.*_1'))
-        assert(self.bgplvm.grep_param_names('l') == self.parameter.grep_param_names('l'))
-        assert(self.bgplvm.grep_param_names('dont_match') == self.parameter.grep_param_names('dont_match'))
-        assert(self.bgplvm.grep_param_names('.*') == self.parameter.grep_param_names('.*'))
+#     def testGrepParamNamesTest(self):
+#         assert(self.bgplvm.grep_param_names('X_\d') == self.parameter.grep_param_names('X_\d'))
+#         assert(self.bgplvm.grep_param_names('X_\d+_1') == self.parameter.grep_param_names('X_\d+_1'))
+#         assert(self.bgplvm.grep_param_names('X_\d_1') == self.parameter.grep_param_names('X_\d_1'))
+#         assert(self.bgplvm.grep_param_names('X_.+_1') == self.parameter.grep_param_names('X_.+_1'))
+#         assert(self.bgplvm.grep_param_names('X_1_1') == self.parameter.grep_param_names('X_1_1'))
+#         assert(self.bgplvm.grep_param_names('X') == self.parameter.grep_param_names('X'))
+#         assert(self.bgplvm.grep_param_names('rbf') == self.parameter.grep_param_names('rbf'))
+#         assert(self.bgplvm.grep_param_names('rbf_l.*_1') == self.parameter.grep_param_names('rbf_l.*_1'))
+#         assert(self.bgplvm.grep_param_names('l') == self.parameter.grep_param_names('l'))
+#         assert(self.bgplvm.grep_param_names('dont_match') == self.parameter.grep_param_names('dont_match'))
+#         assert(self.bgplvm.grep_param_names('.*') == self.parameter.grep_param_names('.*'))
 
     def testGetParams(self):
         assert(numpy.allclose(self.bgplvm._get_params(), self.parameter._get_params()))
@@ -86,12 +88,19 @@ class Test(unittest.TestCase):
         assert(numpy.alltrue(self.parameter.X[:,1] == self.X[:,1]))
         assert(numpy.alltrue(self.parameter.X[:,1] == self.X[:,1]))
         assert(numpy.alltrue(self.parameter.X_variance[1,1] == self.X_variance[1,1]))
+        import ipdb;ipdb.set_trace()
         assert(numpy.alltrue(self.parameter.X_variance[:] == self.X_variance[:]))
         assert(numpy.alltrue(self.parameter.X[:,:][:,0:2][:,1] == self.X[:,1]))
         assert(numpy.alltrue(self.parameter.X[:,1] == self.X[:,1]))
         assert(numpy.alltrue(self.parameter.X_variance[1,1] == self.X_variance[1,1]))
         assert(numpy.alltrue(self.parameter.X_variance[:] == self.X_variance[:]))
 
+    def testConstraints(self):
+        self.parameter[''].unconstrain()
+        self.parameter.X.constrain_positive()
+        self.parameter.X[:,0].unconstrain_positive()
+        assert(numpy.alltrue(self.parameter._constraints.indices()[0] == numpy.r_[1:self.N*self.Q:2]))
+
     def testNdarrayFunc(self):
         assert(numpy.alltrue(self.parameter.X * self.parameter.X == self.X * self.X))
         assert(numpy.alltrue(self.parameter.X * self.parameter.X == self.X * self.X))
@@ -105,5 +114,6 @@ if __name__ == "__main__":
                            'Test.testGetParams',
                            'Test.testNdarrayFunc',
                            'Test.testSetParams',
+                           'Test.testConstraints',
                            ]
     unittest.main()