package main import ( "strings" "testing" ) func TestList(t *testing.T) { out, err := run("ls", domain) if err != nil { t.Fatalf("output: %s, error: %v", out, err) } expected := `REPO TAGS alpine 3.5, latest busybox glibc, latest, musl` if !strings.HasSuffix(strings.TrimSpace(out), expected) { t.Fatalf("expected to contain: %s\ngot: %s", expected, out) } }