[Test] Add test for specifying non-reactant orders in CTI files

interfaces/cython/cantera/test/test_convert.py

@@ -390,3 +390,11 @@ class CtmlConverterTest(utilities.CanteraTest):
         gas = ct.Solution('../data/noninteger-atomicity.cti')
         self.assertNear(gas.molecular_weights[gas.species_index('CnHm')],
                         10.65*gas.atomic_weight('C') + 21.8*gas.atomic_weight('H'))
+
+    def test_reaction_orders(self):
+        gas = ct.Solution('../data/reaction-orders.cti')
+        R = gas.reaction(0)
+        self.assertTrue(R.allow_nonreactant_orders)
+        self.assertNear(R.orders.get('OH'), 0.15)
+        self.assertTrue(R.allow_negative_orders)
+        self.assertNear(R.orders.get('H2'), -0.25)

test/data/reaction-orders.cti

@@ -0,0 +1,23 @@
+# Input file to test use of non-reactant species
+
+units(length = "cm", time = "s", quantity = "mol", act_energy = "kJ/mol")
+
+ideal_gas(name = "gas",
+      elements = " O H ",
+      species = """gri30: H2  O2  H2O OH """,
+      reactions = "all",
+      initial_state = state(temperature = 300.0,
+                        pressure = OneAtm)    )
+
+#-------------------------------------------------------------------------------
+#  Reactions data
+#-------------------------------------------------------------------------------
+
+#test negative orders and non-reactant orders
+reaction("2 H2 + O2 => 2 H2O", [1e13, 0.0, 0.0],
+         order="H2:-0.25 OH:0.15",
+         options=['negative_orders', 'nonreactant_orders'])
+
+#if uncomment, should throw an error
+#reaction("2 H2 + O2 => 2 H2O", [1e13, 0.0, 0.0],
+#         order="OH:0.15")