### Question:
UnknownDose extends AbstractDose { @Override public String toString() { return "Unknown Dose"; }  @Override String toString(); @Override boolean equals(Object o); @Override void setDoseUnit(DoseUnit unit); @Override int hashCode(); @Override AbstractDose clone();  }### Answer:
@Test public void testToString() { assertEquals("Unknown Dose", new UnknownDose().toString()); }