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/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect.testing.testers;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionFeature.RESTRICTS_ELEMENTS;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import com.google.common.collect.testing.AbstractCollectionTester;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.lang.reflect.Method;
/**
* A generic JUnit test which tests {@code add} operations on a collection.
* Can't be invoked directly; please see
* {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
*
* <p>This class is GWT compatible.
*
* @author Chris Povirk
* @author Kevin Bourrillion
*/
@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
public class CollectionAddTester<E> extends AbstractCollectionTester<E> {
@CollectionFeature.Require(SUPPORTS_ADD)
public void testAdd_supportedNotPresent() {
assertTrue("add(notPresent) should return true",
collection.add(samples.e3));
expectAdded(samples.e3);
}
@CollectionFeature.Require(absent = SUPPORTS_ADD)
public void testAdd_unsupportedNotPresent() {
try {
collection.add(samples.e3);
fail("add(notPresent) should throw");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
expectMissing(samples.e3);
}
@CollectionFeature.Require(absent = SUPPORTS_ADD)
@CollectionSize.Require(absent = ZERO)
public void testAdd_unsupportedPresent() {
try {
assertFalse("add(present) should return false or throw",
collection.add(samples.e0));
} catch (UnsupportedOperationException tolerated) {
}
expectUnchanged();
}
@CollectionFeature.Require(
value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
absent = RESTRICTS_ELEMENTS)
public void testAdd_nullSupported() {
assertTrue("add(null) should return true", collection.add(null));
expectAdded((E) null);
}
@CollectionFeature.Require(value = SUPPORTS_ADD,
absent = ALLOWS_NULL_VALUES)
public void testAdd_nullUnsupported() {
try {
collection.add(null);
fail("add(null) should throw");
} catch (NullPointerException expected) {
}
expectUnchanged();
expectNullMissingWhenNullUnsupported(
"Should not contain null after unsupported add(null)");
}
/**
* Returns the {@link Method} instance for {@link #testAdd_nullSupported()} so
* that tests of {@link
* java.util.Collections#checkedCollection(java.util.Collection, Class)} can
* suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()}
* until <a
* href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6409434">Sun bug
* 6409434</a> is fixed. It's unclear whether nulls were to be permitted or
* forbidden, but presumably the eventual fix will be to permit them, as it
* seems more likely that code would depend on that behavior than on the
* other. Thus, we say the bug is in add(), which fails to support null.
*/
public static Method getAddNullSupportedMethod() {
return Platform.getMethod(CollectionAddTester.class, "testAdd_nullSupported");
}
/**
* Returns the {@link Method} instance for {@link #testAdd_nullSupported()} so
* that tests of {@link
* java.util.Collections#checkedCollection(java.util.Collection, Class)} can
* suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()}
* until <a
* href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5045147">Sun
* bug 5045147</a> is fixed.
*/
public static Method getAddNullUnsupportedMethod() {
return Platform.getMethod(CollectionAddTester.class, "testAdd_nullUnsupported");
}
}
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