package main import "testing" func TestList(t *testing.T) { out, err := run("ls") if err != nil { t.Fatalf("output: %s, error: %v", string(out), err) } expected := `Repositories for localhost:5000 REPO TAGS alpine latest ` if out != expected { t.Fatalf("expected: %s\ngot: %s", expected, out) } }