// Then
        assertEquals(expectedSize, result);
        verify(request, times(1)).size();
    }

    @Test
    @DisplayName("Test size returns zero for empty message")
    void testSizeReturnsZero() {
        // Given
        when(request.size()).thenReturn(0);

        // When
        int result = request.size();

        // Then
        assertEquals(0, result);