assertEquals("send size failed", ex.getMessage());
        verify(handle).getSendBufferSize();
    }

    @Test
    @DisplayName("getReceiveBufferSize(): returns configured value")
    void getReceiveBufferSize_returns() throws Exception {
        // Arrange
        when(handle.getReceiveBufferSize()).thenReturn(16384);

        // Act
        int size = handle.getReceiveBufferSize();

        // Assert