diff --git a/postreise/analyze/generation/tests/test_binding.py b/postreise/analyze/generation/tests/test_binding.py
index 753d6446d..787e99a8b 100644
--- a/postreise/analyze/generation/tests/test_binding.py
+++ b/postreise/analyze/generation/tests/test_binding.py
@@ -79,28 +79,31 @@ def setUp(self):
             })
         self.default_expected.set_index('UTC', inplace=True)
 
+    def get_default_expected(self):
+        return self.default_expected.copy()
+
     def test_ramp_constraints_default(self):
         binding_ramps = ramp_constraints(self.mock_scenario)
-        expected = self.default_expected.copy()
-        assert binding_ramps.equals(expected)
+        expected = self.get_default_expected()
+        assert binding_ramps.equals(self.get_default_expected())
 
     def test_ramp_constraints_spec_epsilon1(self):
         # Same results as test_ramp_constraints_default
         binding_ramps = ramp_constraints(self.mock_scenario, epsilon=1e-3)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         assert binding_ramps.equals(expected)
 
     def test_ramp_constraints_spec_epsilon2(self):
         # One differece from test_ramp_constraints_default: ('A', 't3')
         binding_ramps = ramp_constraints(self.mock_scenario, epsilon=1e-6)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc['t3', 'A'] = False
         assert binding_ramps.equals(expected)
 
     def test_ramp_constraints_spec_epsilon3(self):
         # Two differeces from test_ramp_constraints_default: ('A', ['t3'/'t4'])
         binding_ramps = ramp_constraints(self.mock_scenario, epsilon=1e-9)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc[:, 'A'] = False
         assert binding_ramps.equals(expected)
 
@@ -131,25 +134,28 @@ def setUp(self):
             })
         self.default_expected.set_index('UTC', inplace=True)
 
+    def get_default_expected(self):
+        return self.default_expected.copy()
+
     def test_pmin_constraints_default(self):
         binding_pmins = pmin_constraints(self.mock_scenario)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         assert binding_pmins.equals(expected)
 
     def test_pmin_constraints_default_spec_epsilon1(self):
         binding_pmins = pmin_constraints(self.mock_scenario, epsilon=1e-3)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         assert binding_pmins.equals(expected)
 
     def test_pmin_constraints_default_spec_epsilon2(self):
         binding_pmins = pmin_constraints(self.mock_scenario, epsilon=1e-6)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc['t1', 'B'] = False
         assert binding_pmins.equals(expected)
 
     def test_pmin_constraints_default_spec_epsilon3(self):
         binding_pmins = pmin_constraints(self.mock_scenario, epsilon=1e-9)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc['t1', 'B'] = False
         expected.loc['t2', 'C'] = False
         assert binding_pmins.equals(expected)
@@ -181,25 +187,28 @@ def setUp(self):
             })
         self.default_expected.set_index('UTC', inplace=True)
 
+    def get_default_expected(self):
+        return self.default_expected.copy()
+
     def test_pmax_constraints_default(self):
         binding_pmaxs = pmax_constraints(self.mock_scenario)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         assert binding_pmaxs.equals(expected)
 
     def test_pmax_constraints_default_sepc_epsilon1(self):
         binding_pmaxs = pmax_constraints(self.mock_scenario, epsilon=1e-3)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         assert binding_pmaxs.equals(expected)
 
     def test_pmax_constraints_default_sepc_epsilon2(self):
         binding_pmaxs = pmax_constraints(self.mock_scenario, epsilon=1e-6)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc['t1', 'B'] = False
         assert binding_pmaxs.equals(expected)
 
     def test_pmax_constraints_default_sepc_epsilon3(self):
         binding_pmaxs = pmax_constraints(self.mock_scenario, epsilon=1e-9)
-        expected = self.default_expected.copy()
+        expected = self.get_default_expected()
         expected.loc['t1', 'B'] = False
         expected.loc['t2', 'C'] = False
         assert binding_pmaxs.equals(expected)