Add python tests to the travis check

util/travis_build.sh

@@ -51,6 +51,14 @@ if [[ "$TRAVIS_COMMIT_MESSAGE" != *"[skip build]"* ]] ; then
 				fi
 			done
 		fi
+		# Check and run python tests if necessary
+		PFM=$(git diff --name-only -n 1 ${TRAVIS_COMMIT_RANGE} | grep -E '^(lib/python/)' | wc -l)
+		if [ $PFM -gt 0 -o "$BRANCH" = "master" ]; then
+			echo
+			echo "Running python tests."
+			bin/qmk nose2
+			: $((exit_code = $exit_code + $?))
+		fi
 	fi
 	exit $exit_code
 fi