### Question:
RealValue extends Value { @Override Value divide (Value v) { return new RealValue (mValue / v.toRealValue ().mValue); } RealValue(double value);   RealValue(String value); @Override String toString();  }### Answer:
@Test public void testDivide () { assertEquals ("0,25", divide (1, 4)); assertEquals ("-0,25", divide (1, -4)); assertEquals ("-0,25", divide (-1, 4)); assertEquals ("0,25", divide (-1, -4)); }