### Question:
Epsilon extends ERE { @Override public boolean containsEpsilon() { return true; } private  Epsilon(); static Epsilon get(); @Override EREType getEREType(); @Override boolean equals(Object o); @Override int compareTo(Object o); @Override ERE copy(); @Override String toString(); @Override boolean containsEpsilon(); @Override ERE derive(Symbol s);  }### Answer:
@Test public void testContainsEpsilon() { assertTrue(epsilon.containsEpsilon()); }