@Test
  public void loadでネットワークから取得した文字列を返す() throws Exception {
    // SetUp
    String expected = "Hello World";
    NetworkLoader mockLoader = mock(NetworkLoader.class);
    ByteArrayInputStream input = new ByteArrayInputStream(expected.getBytes());
    when(mockLoader.getInput()).thenReturn(input);

    NetworkResources sut = new NetworkResources();
    sut.loader = mockLoader;

    // Exercise
    String actual = sut.load();

    // Verify
    assertThat(actual, is(expected));
  }