Fix case sensitivity for nested fields

api_tests/config_test.go

@@ -2,9 +2,10 @@ package test
 
 import (
 	"encoding/json"
+	"testing"
+
 	"github.com/json-iterator/go"
 	"github.com/stretchr/testify/require"
-	"testing"
 )
 
 func Test_use_number_for_unmarshal(t *testing.T) {
@@ -45,3 +46,129 @@ func Test_read_large_number_as_interface(t *testing.T) {
 	should.Nil(err)
 	should.Equal(`123456789123456789123456789`, output)
 }
+
+type caseSensitiveStruct struct {
+	A string `json:"a"`
+	B string `json:"b,omitempty"`
+	C *C     `json:"C,omitempty"`
+}
+
+type C struct {
+	D int64 `json:"D,omitempty"`
+	E *E    `json:"e,omitempty"`
+}
+
+type E struct {
+	F string `json:"F,omitempty"`
+}
+
+func Test_CaseSensitive(t *testing.T) {
+	should := require.New(t)
+
+	testCases := []struct {
+		input          string
+		expectedOutput string
+		caseSensitive  bool
+	}{
+		{
+			input:          `{"A":"foo","B":"bar"}`,
+			expectedOutput: `{"a":"foo","b":"bar"}`,
+			caseSensitive:  false,
+		},
+		{
+			input:          `{"a":"foo","b":"bar"}`,
+			expectedOutput: `{"a":"foo","b":"bar"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","b":"bar","C":{"D":10}}`,
+			expectedOutput: `{"a":"foo","b":"bar","C":{"D":10}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","B":"bar","c":{"d":10}}`,
+			expectedOutput: `{"a":"foo"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"d":10}}`,
+			expectedOutput: `{"a":"foo","C":{}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"D":10,"e":{"f":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{}}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"A":"foo","c":{"d":10,"E":{"f":"baz"}}}`,
+			expectedOutput: `{"a":"foo","C":{"D":10,"e":{"F":"baz"}}}`,
+			caseSensitive:  false,
+		},
+	}
+
+	for _, tc := range testCases {
+		val := caseSensitiveStruct{}
+		err := jsoniter.Config{CaseSensitive: tc.caseSensitive}.Froze().UnmarshalFromString(tc.input, &val)
+		should.Nil(err)
+
+		output, err := jsoniter.MarshalToString(val)
+		should.Nil(err)
+		should.Equal(tc.expectedOutput, output)
+	}
+}
+
+type structWithElevenFields struct {
+	A string `json:"A,omitempty"`
+	B string `json:"B,omitempty"`
+	C string `json:"C,omitempty"`
+	D string `json:"d,omitempty"`
+	E string `json:"e,omitempty"`
+	F string `json:"f,omitempty"`
+	G string `json:"g,omitempty"`
+	H string `json:"h,omitempty"`
+	I string `json:"i,omitempty"`
+	J string `json:"j,omitempty"`
+	K string `json:"k,omitempty"`
+}
+
+func Test_CaseSensitive_MoreThanTenFields(t *testing.T) {
+	should := require.New(t)
+
+	testCases := []struct {
+		input          string
+		expectedOutput string
+		caseSensitive  bool
+	}{
+		{
+			input:          `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6","g":"7","h":"8","i":"9","j":"10","k":"11"}`,
+			expectedOutput: `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6","g":"7","h":"8","i":"9","j":"10","k":"11"}`,
+			caseSensitive:  true,
+		},
+		{
+			input:          `{"a":"1","b":"2","c":"3","D":"4","E":"5","F":"6"}`,
+			expectedOutput: `{"A":"1","B":"2","C":"3","d":"4","e":"5","f":"6"}`,
+			caseSensitive:  false,
+		},
+		{
+			input:          `{"A":"1","b":"2","d":"4","E":"5"}`,
+			expectedOutput: `{"A":"1","d":"4"}`,
+			caseSensitive:  true,
+		},
+	}
+
+	for _, tc := range testCases {
+		val := structWithElevenFields{}
+		err := jsoniter.Config{CaseSensitive: tc.caseSensitive}.Froze().UnmarshalFromString(tc.input, &val)
+		should.Nil(err)
+
+		output, err := jsoniter.MarshalToString(val)
+		should.Nil(err)
+		should.Equal(tc.expectedOutput, output)
+	}
+}