Add more tests to JSON marshaler

Author: yugui

runtime/marshal_json_test.go

@@ -9,6 +9,11 @@ import (
 
 	"github.com/gengo/grpc-gateway/examples/examplepb"
 	"github.com/gengo/grpc-gateway/runtime"
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes/empty"
+	structpb "github.com/golang/protobuf/ptypes/struct"
+	"github.com/golang/protobuf/ptypes/timestamp"
+	"github.com/golang/protobuf/ptypes/wrappers"
 )
 
 func TestJSONBuiltinMarshal(t *testing.T) {
@@ -31,28 +36,28 @@ func TestJSONBuiltinMarshal(t *testing.T) {
 	}
 }
 
-func TestJSONBuiltinMarshalPrimitive(t *testing.T) {
+func TestJSONBuiltinMarshalField(t *testing.T) {
 	var m runtime.JSONBuiltin
-	for _, v := range []interface{}{
-		"",
-		"foo",
-		1,
-		0,
-		-1,
-		-0.0,
-		1.5,
-	} {
-		buf, err := m.Marshal(v)
+	for _, fixt := range builtinFieldFixtures {
+		buf, err := m.Marshal(fixt.data)
 		if err != nil {
-			t.Errorf("m.Marshal(%v) failed with %v; want success", v, err)
+			t.Errorf("m.Marshal(%v) failed with %v; want success", fixt.data, err)
 		}
+		if got, want := string(buf), fixt.json; got != want {
+			t.Errorf("got = %q; want %q; data = %#v", got, want, fixt.data)
+		}
+	}
+}
 
-		dest := reflect.New(reflect.TypeOf(v))
-		if err := json.Unmarshal(buf, dest.Interface()); err != nil {
-			t.Errorf("json.Unmarshal(%q, unmarshaled) failed with %v; want success", buf, err)
+func TestJSONBuiltinMarshalFieldKnownErrors(t *testing.T) {
+	var m runtime.JSONBuiltin
+	for _, fixt := range builtinKnownErrors {
+		buf, err := m.Marshal(fixt.data)
+		if err != nil {
+			t.Errorf("m.Marshal(%v) failed with %v; want success", fixt.data, err)
 		}
-		if got, want := dest.Elem().Interface(), v; !reflect.DeepEqual(got, want) {
-			t.Errorf("got = %v; want %v", &got, &want)
+		if got, want := string(buf), fixt.json; got == want {
+			t.Errorf("surprisingly got = %q; as want %q; data = %#v", got, want, fixt.data)
 		}
 	}
 }
@@ -76,27 +81,26 @@ func TestJSONBuiltinsnmarshal(t *testing.T) {
 	}
 }
 
-func TestJSONBuiltinUnmarshalPrimitive(t *testing.T) {
+func TestJSONBuiltinUnmarshalField(t *testing.T) {
 	var m runtime.JSONBuiltin
-	for _, spec := range []struct {
-		data string
-		want interface{}
-	}{
-		{data: `""`, want: ""},
-		{data: `"foo"`, want: "foo"},
-		{data: `1`, want: 1},
-		{data: `0`, want: 0},
-		{data: `-1`, want: -1},
-		{data: `-0.0`, want: -0.0},
-		{data: `1.5`, want: 1.5},
-	} {
-		dest := reflect.New(reflect.TypeOf(spec.want))
-		if err := m.Unmarshal([]byte(spec.data), dest.Interface()); err != nil {
-			t.Errorf("m.Unmarshal(%q, dest) failed with %v; want success", spec.data, err)
+	for _, fixt := range builtinFieldFixtures {
+		dest := reflect.New(reflect.TypeOf(fixt.data))
+		if err := m.Unmarshal([]byte(fixt.json), dest.Interface()); err != nil {
+			t.Errorf("m.Unmarshal(%q, dest) failed with %v; want success", fixt.json, err)
+		}
+
+		if got, want := dest.Elem().Interface(), fixt.data; !reflect.DeepEqual(got, want) {
+			t.Errorf("got = %#v; want = %#v; input = %q", got, want, fixt.json)
 		}
+	}
+}
 
-		if got, want := dest.Elem().Interface(), spec.want; !reflect.DeepEqual(got, want) {
-			t.Errorf("got = %v; want = %v", got, want)
+func TestJSONBuiltinUnmarshalFieldKnownErrors(t *testing.T) {
+	var m runtime.JSONBuiltin
+	for _, fixt := range builtinKnownErrors {
+		dest := reflect.New(reflect.TypeOf(fixt.data))
+		if err := m.Unmarshal([]byte(fixt.json), dest.Interface()); err == nil {
+			t.Errorf("m.Unmarshal(%q, dest) succeeded; want ane error", fixt.json)
 		}
 	}
 }
@@ -122,29 +126,17 @@ func TestJSONBuiltinEncoder(t *testing.T) {
 	}
 }
 
-func TestJSONBuiltinEncoderPrimitive(t *testing.T) {
+func TestJSONBuiltinEncoderFields(t *testing.T) {
 	var m runtime.JSONBuiltin
-	for _, v := range []interface{}{
-		"",
-		"foo",
-		1,
-		0,
-		-1,
-		-0.0,
-		1.5,
-	} {
+	for _, fixt := range builtinFieldFixtures {
 		var buf bytes.Buffer
 		enc := m.NewEncoder(&buf)
-		if err := enc.Encode(v); err != nil {
-			t.Errorf("enc.Encode(%v) failed with %v; want success", v, err)
+		if err := enc.Encode(fixt.data); err != nil {
+			t.Errorf("enc.Encode(%#v) failed with %v; want success", fixt.data, err)
 		}
 
-		dest := reflect.New(reflect.TypeOf(v))
-		if err := json.Unmarshal(buf.Bytes(), dest.Interface()); err != nil {
-			t.Errorf("json.Unmarshal(%q, unmarshaled) failed with %v; want success", buf.String(), err)
-		}
-		if got, want := dest.Elem().Interface(), v; !reflect.DeepEqual(got, want) {
-			t.Errorf("got = %v; want %v", &got, &want)
+		if got, want := buf.String(), fixt.json+"\n"; got != want {
+			t.Errorf("got = %q; want %q; data = %#v", got, want, fixt.data)
 		}
 	}
 }
@@ -170,29 +162,84 @@ func TestJSONBuiltinDecoder(t *testing.T) {
 	}
 }
 
-func TestJSONBuiltinDecoderPrimitive(t *testing.T) {
+func TestJSONBuiltinDecoderFields(t *testing.T) {
 	var m runtime.JSONBuiltin
-	for _, spec := range []struct {
-		data string
-		want interface{}
-	}{
-		{data: `""`, want: ""},
-		{data: `"foo"`, want: "foo"},
-		{data: `1`, want: 1},
-		{data: `0`, want: 0},
-		{data: `-1`, want: -1},
-		{data: `-0.0`, want: -0.0},
-		{data: `1.5`, want: 1.5},
-	} {
-		r := strings.NewReader(spec.data)
+	for _, fixt := range builtinFieldFixtures {
+		r := strings.NewReader(fixt.json)
 		dec := m.NewDecoder(r)
-		dest := reflect.New(reflect.TypeOf(spec.want))
+		dest := reflect.New(reflect.TypeOf(fixt.data))
 		if err := dec.Decode(dest.Interface()); err != nil {
-			t.Errorf("dec.Decode(dest) failed with %v; want success; data=%q", err, spec.data)
+			t.Errorf("dec.Decode(dest) failed with %v; want success; data = %q", err, fixt.json)
 		}
 
-		if got, want := dest.Elem().Interface(), spec.want; !reflect.DeepEqual(got, want) {
-			t.Errorf("got = %v; want = %v", got, want)
+		if got, want := dest.Elem().Interface(), fixt.data; !reflect.DeepEqual(got, want) {
+			t.Errorf("got = %v; want = %v; input = %q", got, want, fixt.json)
 		}
 	}
 }
+
+var (
+	builtinFieldFixtures = []struct {
+		data interface{}
+		json string
+	}{
+		{data: "", json: `""`},
+		{data: proto.String(""), json: `""`},
+		{data: "foo", json: `"foo"`},
+		{data: proto.String("foo"), json: `"foo"`},
+		{data: int32(-1), json: "-1"},
+		{data: proto.Int32(-1), json: "-1"},
+		{data: int64(-1), json: "-1"},
+		{data: proto.Int64(-1), json: "-1"},
+		{data: uint32(123), json: "123"},
+		{data: proto.Uint32(123), json: "123"},
+		{data: uint64(123), json: "123"},
+		{data: proto.Uint64(123), json: "123"},
+		{data: float32(-1.5), json: "-1.5"},
+		{data: proto.Float32(-1.5), json: "-1.5"},
+		{data: float64(-1.5), json: "-1.5"},
+		{data: proto.Float64(-1.5), json: "-1.5"},
+		{data: true, json: "true"},
+		{data: proto.Bool(true), json: "true"},
+		{data: (*string)(nil), json: "null"},
+		{data: new(empty.Empty), json: "{}"},
+		{data: examplepb.NumericEnum_ONE, json: "1"},
+		{
+			data: (*examplepb.NumericEnum)(proto.Int32(int32(examplepb.NumericEnum_ONE))),
+			json: "1",
+		},
+	}
+	builtinKnownErrors = []struct {
+		data interface{}
+		json string
+	}{
+		{data: examplepb.NumericEnum_ONE, json: "ONE"},
+		{
+			data: (*examplepb.NumericEnum)(proto.Int32(int32(examplepb.NumericEnum_ONE))),
+			json: "ONE",
+		},
+		{
+			data: &examplepb.ABitOfEverything_OneofString{OneofString: "abc"},
+			json: `"abc"`,
+		},
+		{
+			data: &timestamp.Timestamp{
+				Seconds: 1462875553,
+				Nanos:   123000000,
+			},
+			json: `"2016-05-10T10:19:13.123Z"`,
+		},
+		{
+			data: &wrappers.Int32Value{Value: 123},
+			json: "123",
+		},
+		{
+			data: &structpb.Value{
+				Kind: &structpb.Value_StringValue{
+					StringValue: "abc",
+				},
+			},
+			json: `"abc"`,
+		},
+	}
+)