001/*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
020import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
021import static com.google.common.collect.testing.features.CollectionFeature.NON_STANDARD_TOSTRING;
022import static com.google.common.collect.testing.features.CollectionSize.ONE;
023import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
024import static com.google.common.collect.testing.features.CollectionSize.ZERO;
025
026import com.google.common.annotations.GwtCompatible;
027import com.google.common.collect.testing.AbstractCollectionTester;
028import com.google.common.collect.testing.Helpers;
029import com.google.common.collect.testing.features.CollectionFeature;
030import com.google.common.collect.testing.features.CollectionSize;
031
032/**
033 * A generic JUnit test which tests {@code toString()} operations on a collection. Can't be invoked
034 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
035 *
036 * @author Kevin Bourrillion
037 */
038@GwtCompatible
039public class CollectionToStringTester<E> extends AbstractCollectionTester<E> {
040  public void testToString_minimal() {
041    assertNotNull("toString() should not return null", collection.toString());
042  }
043
044  @CollectionSize.Require(ZERO)
045  @CollectionFeature.Require(absent = NON_STANDARD_TOSTRING)
046  public void testToString_size0() {
047    assertEquals("emptyCollection.toString should return []", "[]", collection.toString());
048  }
049
050  @CollectionSize.Require(ONE)
051  @CollectionFeature.Require(absent = NON_STANDARD_TOSTRING)
052  public void testToString_size1() {
053    assertEquals(
054        "size1Collection.toString should return [{element}]",
055        "[" + e0() + "]",
056        collection.toString());
057  }
058
059  @CollectionSize.Require(SEVERAL)
060  @CollectionFeature.Require(value = KNOWN_ORDER, absent = NON_STANDARD_TOSTRING)
061  public void testToString_sizeSeveral() {
062    String expected = Helpers.copyToList(getOrderedElements()).toString();
063    assertEquals("collection.toString() incorrect", expected, collection.toString());
064  }
065
066  @CollectionSize.Require(absent = ZERO)
067  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
068  public void testToString_null() {
069    initCollectionWithNullElement();
070    testToString_minimal();
071  }
072}