### Question:
ArrayAddExpression extends ArrayUpdateExpression { public Path getField() { return field; } ArrayAddExpression(Path field, UpdateOperator op, List<RValueExpression> list); Path getField(); List<RValueExpression> getValues(); UpdateOperator getOp(); @Override JsonNode toJson(); static ArrayAddExpression fromJson(ObjectNode node); @Override int hashCode(); @Override boolean equals(Object obj);  }### Answer:
@Test public void testGetField() { ArrayAddExpression instance = new ArrayAddExpression(Path.EMPTY, UpdateOperator._set, null); Path expResult = Path.EMPTY; Path result = instance.getField(); assertEquals(expResult, result); }