protobuf-go/encoding/textpb/encode_test.go

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package textpb_test

import (
	"math"
	"strings"
	"testing"

	"github.com/golang/protobuf/v2/encoding/textpb"
	"github.com/golang/protobuf/v2/internal/detrand"
	"github.com/golang/protobuf/v2/internal/impl"
	"github.com/golang/protobuf/v2/internal/scalar"
	"github.com/golang/protobuf/v2/proto"
	"github.com/google/go-cmp/cmp"
	"github.com/google/go-cmp/cmp/cmpopts"

	// The legacy package must be imported prior to use of any legacy messages.
	// TODO: Remove this when protoV1 registers these hooks for you.
	_ "github.com/golang/protobuf/v2/internal/legacy"

	anypb "github.com/golang/protobuf/ptypes/any"
	durpb "github.com/golang/protobuf/ptypes/duration"
	emptypb "github.com/golang/protobuf/ptypes/empty"
	stpb "github.com/golang/protobuf/ptypes/struct"
	tspb "github.com/golang/protobuf/ptypes/timestamp"
	wpb "github.com/golang/protobuf/ptypes/wrappers"
	"github.com/golang/protobuf/v2/encoding/textpb/testprotos/pb2"
	"github.com/golang/protobuf/v2/encoding/textpb/testprotos/pb3"
)

func init() {
	// Disable detrand to enable direct comparisons on outputs.
	detrand.Disable()
}

func M(m interface{}) proto.Message {
	return impl.Export{}.MessageOf(m).Interface()
}

// splitLines is a cmpopts.Option for comparing strings with line breaks.
var splitLines = cmpopts.AcyclicTransformer("SplitLines", func(s string) []string {
	return strings.Split(s, "\n")
})

func TestMarshal(t *testing.T) {
	tests := []struct {
		desc    string
		input   proto.Message
		want    string
		wantErr bool
	}{{
		desc: "nil message",
		want: "\n",
	}, {
		desc:  "proto2 optional scalar fields not set",
		input: M(&pb2.Scalars{}),
		want:  "\n",
	}, {
		desc:  "proto3 scalar fields not set",
		input: M(&pb3.Scalars{}),
		want:  "\n",
	}, {
		desc: "proto2 optional scalar fields set to zero values",
		input: M(&pb2.Scalars{
			OptBool:     scalar.Bool(false),
			OptInt32:    scalar.Int32(0),
			OptInt64:    scalar.Int64(0),
			OptUint32:   scalar.Uint32(0),
			OptUint64:   scalar.Uint64(0),
			OptSint32:   scalar.Int32(0),
			OptSint64:   scalar.Int64(0),
			OptFixed32:  scalar.Uint32(0),
			OptFixed64:  scalar.Uint64(0),
			OptSfixed32: scalar.Int32(0),
			OptSfixed64: scalar.Int64(0),
			OptFloat:    scalar.Float32(0),
			OptDouble:   scalar.Float64(0),
			OptBytes:    []byte{},
			OptString:   scalar.String(""),
		}),
		want: `opt_bool: false
opt_int32: 0
opt_int64: 0
opt_uint32: 0
opt_uint64: 0
opt_sint32: 0
opt_sint64: 0
opt_fixed32: 0
opt_fixed64: 0
opt_sfixed32: 0
opt_sfixed64: 0
opt_float: 0
opt_double: 0
opt_bytes: ""
opt_string: ""
`,
	}, {
		desc: "proto3 scalar fields set to zero values",
		input: M(&pb3.Scalars{
			SBool:     false,
			SInt32:    0,
			SInt64:    0,
			SUint32:   0,
			SUint64:   0,
			SSint32:   0,
			SSint64:   0,
			SFixed32:  0,
			SFixed64:  0,
			SSfixed32: 0,
			SSfixed64: 0,
			SFloat:    0,
			SDouble:   0,
			SBytes:    []byte{},
			SString:   "",
		}),
		want: "\n",
	}, {
		desc: "proto2 optional scalar fields set to some values",
		input: M(&pb2.Scalars{
			OptBool:     scalar.Bool(true),
			OptInt32:    scalar.Int32(0xff),
			OptInt64:    scalar.Int64(0xdeadbeef),
			OptUint32:   scalar.Uint32(47),
			OptUint64:   scalar.Uint64(0xdeadbeef),
			OptSint32:   scalar.Int32(-1001),
			OptSint64:   scalar.Int64(-0xffff),
			OptFixed64:  scalar.Uint64(64),
			OptSfixed32: scalar.Int32(-32),
			// TODO: Update encoder to output same decimals.
			OptFloat:  scalar.Float32(1.02),
			OptDouble: scalar.Float64(1.23e100),
			// TODO: Update encoder to not output UTF8 for bytes.
			OptBytes:  []byte("\xe8\xb0\xb7\xe6\xad\x8c"),
			OptString: scalar.String("谷歌"),
		}),
		want: `opt_bool: true
opt_int32: 255
opt_int64: 3735928559
opt_uint32: 47
opt_uint64: 3735928559
opt_sint32: -1001
opt_sint64: -65535
opt_fixed64: 64
opt_sfixed32: -32
opt_float: 1.0199999809265137
opt_double: 1.23e+100
opt_bytes: "谷歌"
opt_string: "谷歌"
`,
	}, {
		desc:  "proto3 enum empty message",
		input: M(&pb3.Enums{}),
		want:  "\n",
	}, {
		desc: "proto3 enum",
		input: M(&pb3.Enums{
			SEnum:         pb3.Enum_ONE,
			RptEnum:       []pb3.Enum{pb3.Enum_ONE, 10, 0, 21, -1},
			SNestedEnum:   pb3.Enums_DIEZ,
			RptNestedEnum: []pb3.Enums_NestedEnum{21, pb3.Enums_CERO, -7, 10},
		}),
		want: `s_enum: ONE
rpt_enum: ONE
rpt_enum: TEN
rpt_enum: ZERO
rpt_enum: 21
rpt_enum: -1
s_nested_enum: DIEZ
rpt_nested_enum: 21
rpt_nested_enum: CERO
rpt_nested_enum: -7
rpt_nested_enum: DIEZ
`,
	}, {
		desc: "float32 nan",
		input: M(&pb3.Scalars{
			SFloat: float32(math.NaN()),
		}),
		want: "s_float: nan\n",
	}, {
		desc: "float32 positive infinity",
		input: M(&pb3.Scalars{
			SFloat: float32(math.Inf(1)),
		}),
		want: "s_float: inf\n",
	}, {
		desc: "float32 negative infinity",
		input: M(&pb3.Scalars{
			SFloat: float32(math.Inf(-1)),
		}),
		want: "s_float: -inf\n",
	}, {
		desc: "float64 nan",
		input: M(&pb3.Scalars{
			SDouble: math.NaN(),
		}),
		want: "s_double: nan\n",
	}, {
		desc: "float64 positive infinity",
		input: M(&pb3.Scalars{
			SDouble: math.Inf(1),
		}),
		want: "s_double: inf\n",
	}, {
		desc: "float64 negative infinity",
		input: M(&pb3.Scalars{
			SDouble: math.Inf(-1),
		}),
		want: "s_double: -inf\n",
	}, {
		desc: "proto2 bytes set to empty string",
		input: M(&pb2.Scalars{
			OptBytes: []byte(""),
		}),
		want: "opt_bytes: \"\"\n",
	}, {
		desc: "proto3 bytes set to empty string",
		input: M(&pb3.Scalars{
			SBytes: []byte(""),
		}),
		want: "\n",
	}, {
		desc:  "proto2 repeated not set",
		input: M(&pb2.Repeats{}),
		want:  "\n",
	}, {
		desc: "proto2 repeated set to empty slices",
		input: M(&pb2.Repeats{
			RptBool:   []bool{},
			RptInt32:  []int32{},
			RptInt64:  []int64{},
			RptUint32: []uint32{},
			RptUint64: []uint64{},
			RptFloat:  []float32{},
			RptDouble: []float64{},
			RptBytes:  [][]byte{},
		}),
		want: "\n",
	}, {
		desc: "proto2 repeated set to some values",
		input: M(&pb2.Repeats{
			RptBool:   []bool{true, false, true, true},
			RptInt32:  []int32{1, 6, 0, 0},
			RptInt64:  []int64{-64, 47},
			RptUint32: []uint32{0xff, 0xffff},
			RptUint64: []uint64{0xdeadbeef},
			// TODO: add float32 examples.
			RptDouble: []float64{math.NaN(), math.Inf(1), math.Inf(-1), 1.23e-308},
			RptString: []string{"hello", "世界"},
			RptBytes: [][]byte{
				[]byte("hello"),
				[]byte("\xe4\xb8\x96\xe7\x95\x8c"),
			},
		}),
		want: `rpt_bool: true
rpt_bool: false
rpt_bool: true
rpt_bool: true
rpt_int32: 1
rpt_int32: 6
rpt_int32: 0
rpt_int32: 0
rpt_int64: -64
rpt_int64: 47
rpt_uint32: 255
rpt_uint32: 65535
rpt_uint64: 3735928559
rpt_double: nan
rpt_double: inf
rpt_double: -inf
rpt_double: 1.23e-308
rpt_string: "hello"
rpt_string: "世界"
rpt_bytes: "hello"
rpt_bytes: "世界"
`,
	}, {
		desc:  "proto2 enum fields not set",
		input: M(&pb2.Enums{}),
		want:  "\n",
	}, {
		desc: "proto2 enum fields",
		input: M(&pb2.Enums{
			OptEnum:       pb2.Enum_FIRST.Enum(),
			RptEnum:       []pb2.Enum{pb2.Enum_FIRST, 2, pb2.Enum_TENTH, 42},
			OptNestedEnum: pb2.Enums_UNO.Enum(),
			RptNestedEnum: []pb2.Enums_NestedEnum{2, 47, 10},
		}),
		want: `opt_enum: FIRST
rpt_enum: FIRST
rpt_enum: SECOND
rpt_enum: TENTH
rpt_enum: 42
opt_nested_enum: UNO
rpt_nested_enum: DOS
rpt_nested_enum: 47
rpt_nested_enum: DIEZ
`,
	}, {
		desc: "proto3 enum fields set to zero value",
		input: M(&pb3.Enums{
			SEnum:         pb3.Enum_ZERO,
			RptEnum:       []pb3.Enum{},
			SNestedEnum:   pb3.Enums_CERO,
			RptNestedEnum: []pb3.Enums_NestedEnum{},
		}),
		want: "\n",
	}, {
		desc: "proto3 enum fields",
		input: M(&pb3.Enums{
			SEnum:         pb3.Enum_TWO,
			RptEnum:       []pb3.Enum{1, 0, 0},
			SNestedEnum:   pb3.Enums_DOS,
			RptNestedEnum: []pb3.Enums_NestedEnum{101, pb3.Enums_DIEZ, 10},
		}),
		want: `s_enum: TWO
rpt_enum: ONE
rpt_enum: ZERO
rpt_enum: ZERO
s_nested_enum: DOS
rpt_nested_enum: 101
rpt_nested_enum: DIEZ
rpt_nested_enum: DIEZ
`,
	}, {
		desc:  "proto2 nested message not set",
		input: M(&pb2.Nests{}),
		want:  "\n",
	}, {
		desc: "proto2 nested message set to empty",
		input: M(&pb2.Nests{
			OptNested: &pb2.Nested{},
			Optgroup:  &pb2.Nests_OptGroup{},
			RptNested: []*pb2.Nested{},
			Rptgroup:  []*pb2.Nests_RptGroup{},
		}),
		want: `opt_nested: {}
optgroup: {}
`,
	}, {
		desc: "proto2 nested messages",
		input: M(&pb2.Nests{
			OptNested: &pb2.Nested{
				OptString: scalar.String("nested message"),
				OptNested: &pb2.Nested{
					OptString: scalar.String("another nested message"),
				},
			},
			RptNested: []*pb2.Nested{
				{
					OptString: scalar.String("repeat nested one"),
				},
				{
					OptString: scalar.String("repeat nested two"),
					OptNested: &pb2.Nested{
						OptString: scalar.String("inside repeat nested two"),
					},
				},
				{},
			},
		}),
		want: `opt_nested: {
  opt_string: "nested message"
  opt_nested: {
    opt_string: "another nested message"
  }
}
rpt_nested: {
  opt_string: "repeat nested one"
}
rpt_nested: {
  opt_string: "repeat nested two"
  opt_nested: {
    opt_string: "inside repeat nested two"
  }
}
rpt_nested: {}
`,
	}, {
		desc: "proto2 group fields",
		input: M(&pb2.Nests{
			Optgroup: &pb2.Nests_OptGroup{
				OptBool:   scalar.Bool(true),
				OptString: scalar.String("inside a group"),
				OptNested: &pb2.Nested{
					OptString: scalar.String("nested message inside a group"),
				},
				Optnestedgroup: &pb2.Nests_OptGroup_OptNestedGroup{
					OptEnum: pb2.Enum_TENTH.Enum(),
				},
			},
			Rptgroup: []*pb2.Nests_RptGroup{
				{
					RptBool: []bool{true, false},
				},
				{},
			},
		}),
		want: `optgroup: {
  opt_bool: true
  opt_string: "inside a group"
  opt_nested: {
    opt_string: "nested message inside a group"
  }
  optnestedgroup: {
    opt_enum: TENTH
  }
}
rptgroup: {
  rpt_bool: true
  rpt_bool: false
}
rptgroup: {}
`,
	}, {
		desc:  "proto3 nested message not set",
		input: M(&pb3.Nests{}),
		want:  "\n",
	}, {
		desc: "proto3 nested message",
		input: M(&pb3.Nests{
			SNested: &pb3.Nested{
				SString: "nested message",
				SNested: &pb3.Nested{
					SString: "another nested message",
				},
			},
			RptNested: []*pb3.Nested{
				{
					SString: "repeated nested one",
					SNested: &pb3.Nested{
						SString: "inside repeated nested one",
					},
				},
				{
					SString: "repeated nested two",
				},
				{},
			},
		}),
		want: `s_nested: {
  s_string: "nested message"
  s_nested: {
    s_string: "another nested message"
  }
}
rpt_nested: {
  s_string: "repeated nested one"
  s_nested: {
    s_string: "inside repeated nested one"
  }
}
rpt_nested: {
  s_string: "repeated nested two"
}
rpt_nested: {}
`,
	}, {
		desc:    "proto2 required fields not set",
		input:   M(&pb2.Requireds{}),
		want:    "\n",
		wantErr: true,
	}, {
		desc: "proto2 required fields partially set",
		input: M(&pb2.Requireds{
			ReqBool:     scalar.Bool(false),
			ReqFixed32:  scalar.Uint32(47),
			ReqSfixed64: scalar.Int64(0xbeefcafe),
			ReqDouble:   scalar.Float64(math.NaN()),
			ReqString:   scalar.String("hello"),
			ReqEnum:     pb2.Enum_FIRST.Enum(),
		}),
		want: `req_bool: false
req_fixed32: 47
req_sfixed64: 3203386110
req_double: nan
req_string: "hello"
req_enum: FIRST
`,
		wantErr: true,
	}, {
		desc: "proto2 required fields all set",
		input: M(&pb2.Requireds{
			ReqBool:     scalar.Bool(false),
			ReqFixed32:  scalar.Uint32(0),
			ReqFixed64:  scalar.Uint64(0),
			ReqSfixed32: scalar.Int32(0),
			ReqSfixed64: scalar.Int64(0),
			ReqFloat:    scalar.Float32(0),
			ReqDouble:   scalar.Float64(0),
			ReqString:   scalar.String(""),
			ReqEnum:     pb2.Enum_UNKNOWN.Enum(),
			ReqBytes:    []byte{},
			ReqNested:   &pb2.Nested{},
		}),
		want: `req_bool: false
req_fixed32: 0
req_fixed64: 0
req_sfixed32: 0
req_sfixed64: 0
req_float: 0
req_double: 0
req_string: ""
req_bytes: ""
req_enum: UNKNOWN
req_nested: {}
`,
	}, {
		desc:  "oneof fields",
		input: M(&pb2.Oneofs{}),
		want:  "\n",
	}, {
		desc: "oneof field set to empty string",
		input: M(&pb2.Oneofs{
			Union: &pb2.Oneofs_Str{},
		}),
		want: "str: \"\"\n",
	}, {
		desc: "oneof field set to string",
		input: M(&pb2.Oneofs{
			Union: &pb2.Oneofs_Str{
				Str: "hello",
			},
		}),
		want: "str: \"hello\"\n",
	}, {
		desc: "oneof field set to empty message",
		input: M(&pb2.Oneofs{
			Union: &pb2.Oneofs_Msg{
				Msg: &pb2.Nested{},
			},
		}),
		want: "msg: {}\n",
	}, {
		desc: "oneof field set to message",
		input: M(&pb2.Oneofs{
			Union: &pb2.Oneofs_Msg{
				Msg: &pb2.Nested{
					OptString: scalar.String("nested message"),
				},
			},
		}),
		want: `msg: {
  opt_string: "nested message"
}
`,
	}, {
		desc:  "map fields empty",
		input: M(&pb2.Maps{}),
		want:  "\n",
	}, {
		desc: "map fields set to empty maps",
		input: M(&pb2.Maps{
			Int32ToStr:     map[int32]string{},
			Sfixed64ToBool: map[int64]bool{},
			BoolToUint32:   map[bool]uint32{},
			Uint64ToEnum:   map[uint64]pb2.Enum{},
			StrToNested:    map[string]*pb2.Nested{},
			StrToOneofs:    map[string]*pb2.Oneofs{},
		}),
		want: "\n",
	}, {
		desc: "map fields 1",
		input: M(&pb2.Maps{
			Int32ToStr: map[int32]string{
				-101: "-101",
				0xff: "0xff",
				0:    "zero",
			},
			Sfixed64ToBool: map[int64]bool{
				0xcafe: true,
				0:      false,
			},
			BoolToUint32: map[bool]uint32{
				true:  42,
				false: 101,
			},
		}),
		want: `int32_to_str: {
  key: -101
  value: "-101"
}
int32_to_str: {
  key: 0
  value: "zero"
}
int32_to_str: {
  key: 255
  value: "0xff"
}
sfixed64_to_bool: {
  key: 0
  value: false
}
sfixed64_to_bool: {
  key: 51966
  value: true
}
bool_to_uint32: {
  key: false
  value: 101
}
bool_to_uint32: {
  key: true
  value: 42
}
`,
	}, {
		desc: "map fields 2",
		input: M(&pb2.Maps{
			Uint64ToEnum: map[uint64]pb2.Enum{
				1:  pb2.Enum_FIRST,
				2:  pb2.Enum_SECOND,
				10: pb2.Enum_TENTH,
			},
		}),
		want: `uint64_to_enum: {
  key: 1
  value: FIRST
}
uint64_to_enum: {
  key: 2
  value: SECOND
}
uint64_to_enum: {
  key: 10
  value: TENTH
}
`,
	}, {
		desc: "map fields 3",
		input: M(&pb2.Maps{
			StrToNested: map[string]*pb2.Nested{
				"nested_one": &pb2.Nested{
					OptString: scalar.String("nested in a map"),
				},
			},
		}),
		want: `str_to_nested: {
  key: "nested_one"
  value: {
    opt_string: "nested in a map"
  }
}
`,
	}, {
		desc: "map fields 4",
		input: M(&pb2.Maps{
			StrToOneofs: map[string]*pb2.Oneofs{
				"string": &pb2.Oneofs{
					Union: &pb2.Oneofs_Str{
						Str: "hello",
					},
				},
				"nested": &pb2.Oneofs{
					Union: &pb2.Oneofs_Msg{
						Msg: &pb2.Nested{
							OptString: scalar.String("nested oneof in map field value"),
						},
					},
				},
			},
		}),
		want: `str_to_oneofs: {
  key: "nested"
  value: {
    msg: {
      opt_string: "nested oneof in map field value"
    }
  }
}
str_to_oneofs: {
  key: "string"
  value: {
    str: "hello"
  }
}
`,
	}, {
		desc:  "well-known type fields not set",
		input: M(&pb2.KnownTypes{}),
		want:  "\n",
	}, {
		desc: "well-known type fields set to empty messages",
		input: M(&pb2.KnownTypes{
			OptBool:      &wpb.BoolValue{},
			OptInt32:     &wpb.Int32Value{},
			OptInt64:     &wpb.Int64Value{},
			OptUint32:    &wpb.UInt32Value{},
			OptUint64:    &wpb.UInt64Value{},
			OptFloat:     &wpb.FloatValue{},
			OptDouble:    &wpb.DoubleValue{},
			OptString:    &wpb.StringValue{},
			OptBytes:     &wpb.BytesValue{},
			OptDuration:  &durpb.Duration{},
			OptTimestamp: &tspb.Timestamp{},
			OptStruct:    &stpb.Struct{},
			OptList:      &stpb.ListValue{},
			OptValue:     &stpb.Value{},
			OptEmpty:     &emptypb.Empty{},
			OptAny:       &anypb.Any{},
		}),
		want: `opt_bool: {}
opt_int32: {}
opt_int64: {}
opt_uint32: {}
opt_uint64: {}
opt_float: {}
opt_double: {}
opt_string: {}
opt_bytes: {}
opt_duration: {}
opt_timestamp: {}
opt_struct: {}
opt_list: {}
opt_value: {}
opt_empty: {}
opt_any: {}
`,
	}, {
		desc: "well-known type scalar fields",
		input: M(&pb2.KnownTypes{
			OptBool: &wpb.BoolValue{
				Value: true,
			},
			OptInt32: &wpb.Int32Value{
				Value: -42,
			},
			OptInt64: &wpb.Int64Value{
				Value: -42,
			},
			OptUint32: &wpb.UInt32Value{
				Value: 0xff,
			},
			OptUint64: &wpb.UInt64Value{
				Value: 0xffff,
			},
			OptFloat: &wpb.FloatValue{
				Value: 1.234,
			},
			OptDouble: &wpb.DoubleValue{
				Value: 1.23e308,
			},
			OptString: &wpb.StringValue{
				Value: "谷歌",
			},
			OptBytes: &wpb.BytesValue{
				Value: []byte("\xe8\xb0\xb7\xe6\xad\x8c"),
			},
		}),
		want: `opt_bool: {
  value: true
}
opt_int32: {
  value: -42
}
opt_int64: {
  value: -42
}
opt_uint32: {
  value: 255
}
opt_uint64: {
  value: 65535
}
opt_float: {
  value: 1.2339999675750732
}
opt_double: {
  value: 1.23e+308
}
opt_string: {
  value: "谷歌"
}
opt_bytes: {
  value: "谷歌"
}
`,
	}, {
		desc: "well-known type time-related fields",
		input: M(&pb2.KnownTypes{
			OptDuration: &durpb.Duration{
				Seconds: -3600,
				Nanos:   -123,
			},
			OptTimestamp: &tspb.Timestamp{
				Seconds: 1257894000,
				Nanos:   123,
			},
		}),
		want: `opt_duration: {
  seconds: -3600
  nanos: -123
}
opt_timestamp: {
  seconds: 1257894000
  nanos: 123
}
`,
	}, {
		desc: "well-known type struct field and different Value types",
		input: M(&pb2.KnownTypes{
			OptStruct: &stpb.Struct{
				Fields: map[string]*stpb.Value{
					"bool": &stpb.Value{
						Kind: &stpb.Value_BoolValue{
							BoolValue: true,
						},
					},
					"double": &stpb.Value{
						Kind: &stpb.Value_NumberValue{
							NumberValue: 3.1415,
						},
					},
					"null": &stpb.Value{
						Kind: &stpb.Value_NullValue{
							NullValue: stpb.NullValue_NULL_VALUE,
						},
					},
					"string": &stpb.Value{
						Kind: &stpb.Value_StringValue{
							StringValue: "string",
						},
					},
					"struct": &stpb.Value{
						Kind: &stpb.Value_StructValue{
							StructValue: &stpb.Struct{
								Fields: map[string]*stpb.Value{
									"bool": &stpb.Value{
										Kind: &stpb.Value_BoolValue{
											BoolValue: false,
										},
									},
								},
							},
						},
					},
					"list": &stpb.Value{
						Kind: &stpb.Value_ListValue{
							ListValue: &stpb.ListValue{
								Values: []*stpb.Value{
									{
										Kind: &stpb.Value_BoolValue{
											BoolValue: false,
										},
									},
									{
										Kind: &stpb.Value_StringValue{
											StringValue: "hello",
										},
									},
								},
							},
						},
					},
				},
			},
		}),
		want: `opt_struct: {
  fields: {
    key: "bool"
    value: {
      bool_value: true
    }
  }
  fields: {
    key: "double"
    value: {
      number_value: 3.1415
    }
  }
  fields: {
    key: "list"
    value: {
      list_value: {
        values: {
          bool_value: false
        }
        values: {
          string_value: "hello"
        }
      }
    }
  }
  fields: {
    key: "null"
    value: {
      null_value: NULL_VALUE
    }
  }
  fields: {
    key: "string"
    value: {
      string_value: "string"
    }
  }
  fields: {
    key: "struct"
    value: {
      struct_value: {
        fields: {
          key: "bool"
          value: {
            bool_value: false
          }
        }
      }
    }
  }
}
`,
	}}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.desc, func(t *testing.T) {
			t.Parallel()
			want := tt.want
			b, err := textpb.Marshal(tt.input)
			if err != nil && !tt.wantErr {
				t.Errorf("Marshal() returned error: %v\n\n", err)
			}
			if tt.wantErr && err == nil {
				t.Errorf("Marshal() got nil error, want error\n\n")
			}
			if got := string(b); got != want {
				t.Errorf("Marshal()\n<got>\n%v\n<want>\n%v\n", got, want)
				if diff := cmp.Diff(want, got, splitLines); diff != "" {
					t.Errorf("Marshal() diff -want +got\n%v\n", diff)
				}
			}
		})
	}
}