Add golang testing tips

src/SUMMARY.md

@@ -3,6 +3,8 @@
 [Introduction](./structure/intro.md)
 
 - [Dev](./dev/main.md)
+    - [Golang](./dev/golang/main.md)
+        - [Testing](./dev/golang/testing.md)
     - [Web](./dev/web/main.md)
         - [front](./dev/web/front/main.md)
             - [babel and babel-preset-stage-2](./dev/web/front/babel-preset-stage-2.md)

src/dev/golang/main.md

@@ -0,0 +1 @@
+# Golang

src/dev/golang/testing.md

@@ -0,0 +1,79 @@
+# Testing tips, golang edition
+
+[Documentation](https://golang.org/pkg/testing/)
+
+## Files
+
+Test file should be place in the package directory and should be name using
+the following convention :
+
+- repo : github.com/go/pkg
+- package : github.com/go/pkg/example
+- package file : example/pkg.go
+- test file : exemple/pkg_test.go
+
+## Run
+
+```shell
+go test github.com/go/pkg/package
+```
+
+### fmt.Println is not working
+
+Gniagniagnia, use
+
+```golang
+t.Log()
+```
+
+or
+
+```golang
+t.Logf()
+```
+also,
+
+```shell
+go test github.com/go/pkg/package -v
+```
+
+## How to fail
+
+### Mark test as failed (next tests executed)
+
+```golang
+t.Fail()
+```
+### Mark test as failed AND exit
+
+```golang
+t.FailNow()
+```
+
+### Print and mark test as failed
+
+```golang
+t.Error()
+```
+
+or
+
+```golang
+t.Errorf()
+```
+
+### Print, mark test as failed AND exit
+
+```golang
+t.Fatal()
+```
+
+or
+
+```golang
+t.Fatalf()
+```
+
+## I don't want my tests to be messy (kudos @athoune)
+
+[Assert](https://godoc.org/github.com/stretchr/testify/assert)