@Test
  public void testSettingRootsUnsupportedByPathType() {
    assertIllegalRoots(PathType.unix(), "\\");
    assertIllegalRoots(PathType.unix(), "/", "\\");
    assertIllegalRoots(PathType.windows(), "/");
    assertIllegalRoots(PathType.windows(), "C:"); // must have a \ (or a /)
  }
Tests for {@link Configuration}, {@link Configuration.Builder} and file systems created from
them.

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