### Question:
FieldAndRValue implements Serializable { public void setRValue(RValueExpression e) { rvalue = e; } FieldAndRValue();  FieldAndRValue(Path field, RValueExpression rvalue); Path getField(); void setField(Path p); RValueExpression getRValue(); void setRValue(RValueExpression e); @Override String toString(); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void testSetRValue() { RValueExpression expResult = null; FieldAndRValue instance = new FieldAndRValue(); instance.setRValue(expResult); RValueExpression result = instance.getRValue(); assertEquals(expResult, result); expResult = new RValueExpression(new Value(JsonNodeFactory.instance.objectNode())); instance.setRValue(expResult); result = instance.getRValue(); assertEquals(expResult, result); }