assertEquals("receive size failed", ex.getMessage());
        verify(handle).getReceiveBufferSize();
    }

    @Test
    @DisplayName("getMaximumBufferSize(): returns configured value")
    void getMaximumBufferSize_returns() throws Exception {
        // Arrange
        when(handle.getMaximumBufferSize()).thenReturn(65535);

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

        // Assert

Shinsuke Sugaya <******@****.***> 1755307968 +0900

Shinsuke Sugaya <******@****.***> 1755149504 +0900