golang生成功能测试的代码覆盖率

Question

I have a go webservices (a REST Api) for which we have unit test, and for which go cover works fine.

Now we have a test suite written in python that launch a instance of the server, run the test , stop the server.

I would like to know if there's some tools that would permit me to run my server binary with a specific flag , so that at the end it prints coverage of the tests executed by my "blackbox" testing ?

Thanks.

Answer 1

Based on this post here's what I did:

1. created a main_test.go with this content:

   package main
   
   // code based on technique explained here:
   // https://www.elastic.co/blog/code-coverage-for-your-golang-system-tests
   // you can look there if you want to see how not to execute this test
   // when running unit test etc.
   
   // This file is mandatory as otherwise the packetbeat.test binary is not generated correctly.
   
   import (
       "testing"
   )
   
   // Test started when the test binary is started. Only calls main.
   func TestSystem(t *testing.T) {
       main()
   }
   

2. as it was a web services (and hence in an infinite loop), I needed a way to gracefully exit on SIGTERM (without it being considered a failure), so I used the package go get gopkg.in/tylerb/graceful.v1 and replaced (I use go-restful) in main.go the line

       -       log.Fatal(http.ListenAndServe(":"+port, nil))
       +       graceful.Run(":"+port, 10*time.Second, nil)
   

3. then I would run the test like this

   • go test -c -covermode=count -coverpkg ./... -o foo.test
   • ./foo.test -test.coverprofile coverage.cov & echo $! > /tmp/test.pid
   • run my test suite
   • kill "$(cat /tmp/test.pid)"