### Question:
FieldAndRValue implements Serializable { public void setField(Path p) { field = p; } 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 testSetField() { Path expResult = null; FieldAndRValue instance = new FieldAndRValue(); instance.setField(expResult); Path result = instance.getField(); assertEquals(expResult, result); expResult = new Path("Test"); instance.setField(expResult); result = instance.getField(); assertEquals(expResult, result); }