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      1 /*
      2  * Copyright (C) 2008 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing.testers;
     18 
     19 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
     20 import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
     21 
     22 import com.google.common.collect.testing.features.CollectionFeature;
     23 
     24 /**
     25  * A generic JUnit test which tests offer operations on a queue. Can't be
     26  * invoked directly; please see
     27  * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
     28  *
     29  * <p>This class is GWT compatible.
     30  *
     31  * @author Jared Levy
     32  */
     33 @SuppressWarnings("unchecked") // too many "unchecked generic array creations"
     34 public class QueueOfferTester<E> extends AbstractQueueTester<E> {
     35   @CollectionFeature.Require(SUPPORTS_ADD)
     36   public void testOffer_supportedNotPresent() {
     37     assertTrue("offer(notPresent) should return true",
     38         getQueue().offer(samples.e3));
     39     expectAdded(samples.e3);
     40   }
     41 
     42   @CollectionFeature.Require({SUPPORTS_ADD, ALLOWS_NULL_VALUES})
     43   public void testOffer_nullSupported() {
     44     assertTrue("offer(null) should return true", getQueue().offer(null));
     45     expectAdded((E) null);
     46   }
     47 
     48   @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
     49   public void testOffer_nullUnsupported() {
     50     try {
     51       getQueue().offer(null);
     52       fail("offer(null) should throw");
     53     } catch (NullPointerException expected) {
     54     }
     55     expectUnchanged();
     56     expectNullMissingWhenNullUnsupported(
     57         "Should not contain null after unsupported offer(null)");
     58   }
     59 }
     60