package main import ( "strings" "testing" ) func TestList(t *testing.T) { out, err := run("ls") if err != nil { t.Fatalf("output: %s, error: %v", string(out), err) } expected := []string{"alpine latest", "busybox glibc, musl"} for _, e := range expected { if !strings.Contains(out, e) { t.Logf("expected to contain: %s\ngot: %s", e, out) } } }