Update test_parser.py

test_parser.py

+def valid():
+    parsedInput = input.preprocess().tokenise().parse()
+    return parsedInput.isValid()
+    # should also correctly identify each token as (in order)
+    
+input = "beat the butter and sugar with an electric whisk until well combined"
+valid(input)
+# input:    beat the butter and sugar with an electric whisk until well combined
+# parsed:   verb article ingredient conjunction ingredient preposition article utensil preposition adverb verb
+
+# input:    To make the buttercream, beat the butter, icing sugar and vanilla with an electric whisk until pale and creamy
+# parsed:   preposition verb article mixture verb article ingredient ingredient conjunction ingredient preposition article utensil preposition adjective conjunction adjective