feat: Add unit test for DeleteGroupMemberHash meth (#1200)

Co-authored-by: sweep-ai[bot] <128439645+sweep-ai[bot]@users.noreply.github.com>

tests/group_test.go

@@ -0,0 +1,22 @@
+package tests
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/openimsdk/open-im-server/v3/pkg/common/db/controller"
+)
+
+func TestDeleteGroupMemberHash(t *testing.T) {
+	mockGroupDB := new(controller.MockGroupDatabase)
+
+	testGroupMemberHash := "testGroupMemberHash"
+
+	err := mockGroupDB.DeleteGroupMemberHash(testGroupMemberHash)
+	assert.Nil(t, err)
+
+	nonExistentGroupMemberHash := "nonExistentGroupMemberHash"
+
+	err = mockGroupDB.DeleteGroupMemberHash(nonExistentGroupMemberHash)
+	assert.NotNil(t, err)
+}