@Test
  public void testSetDefaultAttributeValue_illegalAttributeFormat() {
    try {
      Configuration.unix().toBuilder().setDefaultAttributeValue("foo", 1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }
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