add TNAMES usage to makefile

Makefile

@@ -1,5 +1,6 @@
 CLANG ?= clang
 CFLAGS := -O2 -g -Wall -Werror $(CFLAGS)
+TNAMES ?= .*
 
 .PHONY: generate compile build build-docker test test-docker
 
@@ -16,8 +17,11 @@ build: generate compile
 build-docker:
 	docker build -t durdur -f images/Dockerfile .
 
+# To run all tests, just run `make test`.
+# If you need to run specific tests, you can use `TNAMES`,
+# Example: `TNAMES="TestDrop|TestUndrop" make test`
 test: generate
-	CGO_ENABLED=0 go test -exec sudo ./... -v -cover -coverprofile=coverage.txt -covermode=atomic -p=1
+	CGO_ENABLED=0 go test -exec sudo ./... -run "^$(TNAMES)$\" -v -cover -coverprofile=coverage.txt -covermode=atomic -p=1
 
 test-docker:
 	docker build -t durdur-test -q -f images/Dockerfile.tests . && \