Add tests (#16)

Author: mbilski

Makefile

@@ -1,5 +1,3 @@
-all: build test lint
-
 install:
 	go install .
 
@@ -11,3 +9,5 @@ test:
 
 lint:
 	docker run --rm -v $(shell pwd):/app -w /app golangci/golangci-lint:v1.50.1 golangci-lint run
+
+all: build test lint