Add test for --poll

Author: RyanZim

Makefile

@@ -42,6 +42,17 @@ test-watch: test/import-*.css
 	kill `cat test/watch.pid` # FIXME: never reached on failure
 	rm test/watch.pid
 
+test-watch-poll: test/import-*.css
+	echo '@import "import-foo.css";' > test/import-index.css
+	./bin/postcss -c test/config-watch.js -w --poll & echo $$! > test/watch.pid
+	sleep 1
+	$(DIFF) test/build/watch.css test/ref/watch-1.css
+	echo '@import "import-bar.css";' >> test/import-index.css
+	sleep 1
+	$(DIFF) test/build/watch.css test/ref/watch-2.css
+	kill `cat test/watch.pid` # FIXME: never reached on failure
+	rm test/watch.pid
+
 test-local-plugins:
 	cd test; ../bin/postcss --use a-dummy-plugin --local-plugins -o build/local-plugins in.css