### Question:
IntegerIdentifier implements IIdentifier, Serializable { public void setString(String value) { _id = Integer.parseInt(value); } IntegerIdentifier(int value); boolean equals(Object rhs); synchronized int hashCode(); String toString(); void setString(String value);  }### Answer:
@Test public void testSetString() { Assert.assertEquals(value, classUnderTest.hashCode()); classUnderTest.setString("5"); Assert.assertEquals(5, classUnderTest.hashCode()); }