func BenchmarkMarshalTextUnbuffered(b *testing.B) {
	w := ioutil.Discard
	m := newTestMessage()
	for i := 0; i < b.N; i++ {
		proto.MarshalText(w, m)
	}
}

func BenchmarkMarshalTextBuffered(b *testing.B) {
	buf := new(bytes.Buffer)
	m := newTestMessage()
	for i := 0; i < b.N; i++ {
		buf.Reset()
		proto.MarshalText(buf, m)
	}
}

func TestMarshalTextCustomMessage(t *testing.T) {
	buf := new(bytes.Buffer)
	if err := proto.MarshalText(buf, &textMessage{}); err != nil {
		t.Fatalf("proto.MarshalText: %v", err)
	}
	s := buf.String()
	if s != "custom" {
		t.Errorf("Got %q, expected %q", s, "custom")
	}
}

func TestMarshalText(t *testing.T) {
	buf := new(bytes.Buffer)
	if err := proto.MarshalText(buf, newTestMessage()); err != nil {
		t.Fatalf("proto.MarshalText: %v", err)
	}
	s := buf.String()
	if s != text {
		t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, text)
	}
}

func TestMarshalTextNil(t *testing.T) {
	want := "<nil>"
	tests := []proto.Message{nil, (*pb.MyMessage)(nil)}
	for i, test := range tests {
		buf := new(bytes.Buffer)
		if err := proto.MarshalText(buf, test); err != nil {
			t.Fatal(err)
		}
		if got := buf.String(); got != want {
			t.Errorf("%d: got %q want %q", i, got, want)
		}
	}
}

func TestMarshalTextFailing(t *testing.T) {
	// Try lots of different sizes to exercise more error code-paths.
	for lim := 0; lim < len(text); lim++ {
		buf := new(limitedWriter)
		buf.limit = lim
		err := proto.MarshalText(buf, newTestMessage())
		// We expect a certain error, but also some partial results in the buffer.
		if err != outOfSpace {
			t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", err, outOfSpace)
		}
		s := buf.b.String()
		x := text[:buf.limit]
		if s != x {
			t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, x)
		}
	}
}

func TestStringEscaping(t *testing.T) {
	testCases := []struct {
		in  *pb.Strings
		out string
	}{
		{
			// Test data from C++ test (TextFormatTest.StringEscape).
			// Single divergence: we don't escape apostrophes.
			&pb.Strings{StringField: proto.String("\"A string with ' characters \n and \r newlines and \t tabs and \001 slashes \\ and  multiple   spaces")},
			"string_field: \"\\\"A string with ' characters \\n and \\r newlines and \\t tabs and \\001 slashes \\\\ and  multiple   spaces\"\n",
		},
		{
			// Test data from the same C++ test.
			&pb.Strings{StringField: proto.String("\350\260\267\346\255\214")},
			"string_field: \"\\350\\260\\267\\346\\255\\214\"\n",
		},
		{
			// Some UTF-8.
			&pb.Strings{StringField: proto.String("\x00\x01\xff\x81")},
			`string_field: "\000\001\377\201"` + "\n",
		},
	}

	for i, tc := range testCases {
		var buf bytes.Buffer
		if err := proto.MarshalText(&buf, tc.in); err != nil {
			t.Errorf("proto.MarsalText: %v", err)
			continue
		}
		s := buf.String()
		if s != tc.out {
			t.Errorf("#%d: Got:\n%s\nExpected:\n%s\n", i, s, tc.out)
			continue
		}

		// Check round-trip.
		pb := new(pb.Strings)
		if err := proto.UnmarshalText(s, pb); err != nil {
			t.Errorf("#%d: UnmarshalText: %v", i, err)
			continue
		}
		if !proto.Equal(pb, tc.in) {
			t.Errorf("#%d: Round-trip failed:\nstart: %v\n  end: %v", i, tc.in, pb)
		}
	}
}