Update Makefile to better support integration tests

Signed-off-by: Chun-Hung Tseng <[email protected]>

Makefile

@@ -18,8 +18,22 @@ verify-gofmt:
 test:
 	go test -v --race -cpu=1,2,4 ./code/ ./runtime/
 
-.PHONY: integration-test
-integration-test: gofail
+# run all integration tests
+.PHONY: run-integration-test
+run-integration-test: run-integration-test-sleep
+
+.PHONY: build-integration-test
+build-integration-test: gofail
+
+.PHONY: cleanup-integration-test
+cleanup-integration-test: clean
+
+# run integration test - sleep
+.PHONY: run-integration-test-sleep
+run-integration-test-sleep: build-integration-test execute-integration-test-sleep cleanup-integration-test
+
+.PHONY: execute-integration-test-sleep
+execute-integration-test-sleep:
 	./integration/sleep/execute.sh
 
 fix: fix-gofmt