### Question:
InvocationValueImpl implements InvocationValue { @Override public String getValue() { return value; } InvocationValueImpl(); private  InvocationValueImpl(InvocationValue prototype); @Override String getValue(); @Override InvocationValue setValue(String value); @Override Type getType(); @Override InvocationValue set(Type type); @Override List<Value<?>> getValues(); @Override Value<String> copy(); @Override boolean equals(Object o); @Override int hashCode();  }### Answer:
@Test void getValue() { assertNull(instance().getValue()); }