gotestlint is a linter for Go source code

it shows functions not had been covered by tests

Usage

invoke gotestlint with one argument, that's path to package gotestlint doesn't go through your folders (don't recursive). The one checks only one package

$ gotestlint .
lint.go:20:function LintFiles is not covered any tests
lint.go:47:function String is not covered any tests

there's a recursive variant for it

gotestlint ./...
lint.go:27:function LintFiles is not covered any tests

It also can check only a bit files, something like this

gotestlint lint.go test_folder/test_folder.go 
lint.go:20:function LintSource is not covered any tests
lint.go:27:function LintFiles is not covered any tests
lint.go:54:function String is not covered any tests
test_folder/test_folder.go:3:function SomeFunc is not covered any tests
...

if all functions are covered by tests, it won't show any messages

$ gotestlint $GOPATH/src/github.com/your_the_best_project

you can add option nolint: gotestlint in comment your function if function is marked such way, gotestlint ignores that function, for example

// Foo ...
// 
// nolint: gotestlint
func Foo(){
}