A failing unit test for chemkin files with weird names in PDep rates.

Reactions of the type
 A (+B) <=> C (+B)
ought to work, as long as they are provided a pressure-dependent rate
expression. This commit adds three examples to the test file. The first
works OK, the second two cause problems.

(For what it's worth, this currently crashes the official chemkin.
 Or at least the parentheses do; I've not tested the plus.
 Ansys have created a defect record and say they will fix the issue.)

interfaces/cython/cantera/test/test_convert.py

@@ -151,7 +151,7 @@ def test_pathologicalSpeciesNames(self):
         self.assertEqual(gas.species_name(5), 'eq=uals')
         self.assertEqual(gas.species_name(6), 'plus')
 
-        self.assertEqual(gas.n_reactions, 7)
+        self.assertEqual(gas.n_reactions, 10)
         nu = gas.product_stoich_coeffs() - gas.reactant_stoich_coeffs()
         self.assertEqual(list(nu[:,0]), [-1, -1, 0, 2, 0, 0, 0])
         self.assertEqual(list(nu[:,1]), [-2, 3, 0, -1, 0, 0, 0])

test/data/species-names.inp

@@ -45,5 +45,11 @@ plus+ + (Parens) = 2plus+          9.999e9   9.9   999.9
 plus + plus+ = 2 (Parens)          9.999e9   9.9   999.9
 plus+ eq=uals = plus++(Parens)     9.999e9   9.9   999.9
 co:lons: + eq=uals = 2 (Parens)     9.999e9   9.9   999.9
+plus+ (+plus) = eq=uals  (+plus)     9.999e9   9.9   999.9
+LOW / 8.888e8   8.8   888.8 /
+plus+ (+(Parens)) = eq=uals  (+(Parens))     9.999e9   9.9   999.9
+LOW / 8.888e8   8.8   888.8 /
+plus+ (+plus+) = eq=uals  (+plus+)     9.999e9   9.9   999.9
+LOW / 8.888e8   8.8   888.8 /
 
 end