feat(Makefile): add test target

ref jenkins-jobs#343

Author: Vaughn Dice

Makefile

@@ -66,8 +66,11 @@ test-buildpacks:
 test-dockerfiles:
 	ginkgo --focus="all dockerfile apps" tests
 
-docker-test-style:
-	docker run --rm -v ${CURDIR}:/bash -w /bash quay.io/deis/shell-dev shellcheck *.sh
+test: test-style
+
+test-style:
+	docker run --rm -v ${CURDIR}:/bash -w /bash \
+		quay.io/deis/shell-dev shellcheck $(wildcard *.sh)
 
 docker-build:
 	docker build -t ${IMAGE} ${CURDIR}
@@ -89,7 +92,8 @@ docker-test-integration:
 				bootstrap \
 				docker-bootstrap \
 				test-integration \
-				docker-test-style \
+				test \
+				test-style \
 				docker-build \
 				docker-push \
 				docker-immutable-push \