diff --git a/binder/mapping_test.go b/binder/mapping_test.go
index aec91ff2be..af29b16c00 100644
--- a/binder/mapping_test.go
+++ b/binder/mapping_test.go
@@ -1,6 +1,7 @@
 package binder
 
 import (
+	"errors"
 	"reflect"
 	"testing"
 
@@ -29,3 +30,50 @@ func Test_EqualFieldType(t *testing.T) {
 	require.True(t, equalFieldType(&user, reflect.Int, "AGE"))
 	require.True(t, equalFieldType(&user, reflect.Int, "age"))
 }
+
+func Test_ParseParamSquareBrackets(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+		err      error
+	}{
+		{
+			input:    "foo[bar]",
+			expected: "foo.bar",
+			err:      nil,
+		},
+		{
+			input:    "foo[bar][baz]",
+			expected: "foo.bar.baz",
+			err:      nil,
+		},
+		{
+			input:    "foo[bar",
+			expected: "",
+			err:      errors.New("unmatched brackets"),
+		},
+		{
+			input:    "foo[bar][baz",
+			expected: "",
+			err:      errors.New("unmatched brackets"),
+		},
+		{
+			input:    "foo]bar[",
+			expected: "",
+			err:      errors.New("unmatched brackets"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			result, err := parseParamSquareBrackets(tt.input)
+			if tt.err != nil {
+				require.Error(t, err)
+				require.EqualError(t, err, tt.err.Error())
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.expected, result)
+			}
+		})
+	}
+}