* 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
* 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.
import static com.google.common.base.Preconditions.checkNotNull;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertTrue;
To use, create a new EqualsTester and add equality groups where each group contains objects that are supposed to be equal to each other, and objects of different groups are expected to be unequal. For example:
new EqualsTester() .addEqualityGroup("hello", "h" + "ello") .addEqualityGroup("world", "wor" + "ld") .addEqualityGroup(2, 1 + 1) .testEquals();
When a test fails, the error message labels the objects involved in the failed comparison as follows:
]" refers to the jth item in the ith equality group, where both equality groups and the items within equality groups are numbered starting from 1. When either a constructor argument or an equal object is provided, that becomes group 1.