fix: test failure

core/mapping/utils.go

@@ -255,7 +255,7 @@ func parseGroupedSegments(val string) []string {
 
 // don't modify returned fieldOptions, it's cached and shared among different calls.
 func parseKeyAndOptions(tagName string, field reflect.StructField) (string, *fieldOptions, error) {
-	value := field.Tag.Get(tagName)
+	value := strings.TrimSpace(field.Tag.Get(tagName))
 	if len(value) == 0 {
 		return field.Name, nil, nil
 	}

core/mapping/utils_test.go

@@ -144,6 +144,10 @@ func TestParseSegments(t *testing.T) {
 			input:  "",
 			expect: []string{},
 		},
+		{
+			input:  "   ",
+			expect: []string{},
+		},
 		{
 			input:  ",",
 			expect: []string{""},