chore: for backward compatibility (#4852)

Signed-off-by: kevin <wanjunfeng@gmail.com>

core/stringx/strings_test.go

@@ -7,6 +7,28 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestContainsString(t *testing.T) {
+	cases := []struct {
+		slice  []string
+		value  string
+		expect bool
+	}{
+		{[]string{"1"}, "1", true},
+		{[]string{"1"}, "2", false},
+		{[]string{"1", "2"}, "1", true},
+		{[]string{"1", "2"}, "3", false},
+		{nil, "3", false},
+		{nil, "", false},
+	}
+
+	for _, each := range cases {
+		t.Run(path.Join(each.slice...), func(t *testing.T) {
+			actual := Contains(each.slice, each.value)
+			assert.Equal(t, each.expect, actual)
+		})
+	}
+}
+
 func TestNotEmpty(t *testing.T) {
 	cases := []struct {
 		args   []string