@Test
  public void testFileSystem() {
    assertThat(fs.getSeparator()).isEqualTo("\\");
    assertThat(fs.getRootDirectories())
        .containsExactlyElementsIn(ImmutableSet.of(path("C:\\"), path("E:\\")))
        .inOrder();
    assertThat(fs.isOpen()).isTrue();
    assertThat(fs.isReadOnly()).isFalse();
    assertThat(fs.supportedFileAttributeViews())
        .containsExactly("basic", "owner", "dos", "acl", "user");
    assertThat(fs.provider()).isInstanceOf(JimfsFileSystemProvider.class);
  }
Tests a Windows-like file system through the public methods in {@link Files}.

@author Colin Decker
jimfs/src/test/java/com/google/common/jimfs/JimfsWindowsLikeFileSystemTest.java