tsk-59: Changes to store and mock package

internal/store/mock/message_event_response_store.go

@@ -62,3 +62,21 @@ func (m *MockMessageEventResponseStore) Create(ctx context.Context, mer *message
 }
 
 // TODO: Add code to get mock MessageEventResponse
+func (m *MockMessageEventResponseStore) GetWithUserId(ctx context.Context, userId uuid.UUID) ([]*message.MessageEventResponse, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return nil, m.Error
+	}
+
+	var messages []*message.MessageEventResponse
+	for _, msg := range m.MessageEventResponses {
+		if msg.UserId == userId {
+			messages = append(messages, msg)
+		}
+	}
+
+
+	return messages, nil
+}