diff --git a/tests/user_test.go b/tests/user_test.go
new file mode 100644
index 000000000..b14ae0508
--- /dev/null
+++ b/tests/user_test.go
@@ -0,0 +1,41 @@
+package cache_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/openimsdk/open-im-server/v3/pkg/common/db/cache"
+)
+
+func TestRemoveRepeatedElementsInList(t *testing.T) {
+	testCases := []struct {
+		name     string
+		input    []string
+		expected []string
+	}{
+		{
+			name:     "empty list",
+			input:    []string{},
+			expected: []string{},
+		},
+		{
+			name:     "list with no duplicates",
+			input:    []string{"a", "b", "c"},
+			expected: []string{"a", "b", "c"},
+		},
+		{
+			name:     "list with duplicates",
+			input:    []string{"a", "b", "a", "c", "b"},
+			expected: []string{"a", "b", "c"},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			actual := cache.RemoveRepeatedElementsInList(tc.input)
+			if !reflect.DeepEqual(actual, tc.expected) {
+				t.Errorf("RemoveRepeatedElementsInList(%v) = %v; want %v", tc.input, actual, tc.expected)
+			}
+		})
+	}
+}