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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly

There is a newer version: 5.2.0

/**
 * Copyright 2001-2015 the original author or 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 org.easymock;

/**
 * Used to answer expected calls.
 * 
 * @param 
 *            the type to return.
 * 
 * @author OFFIS, Tammo Freese
 */
public interface IAnswer {

    /**
     * Is called by EasyMock to answer an expected call. The answer may be to
     * return a value, or to throw an exception. The arguments of the call for
     * which the answer is generated are available via
     * {@link EasyMock#getCurrentArguments()} - be careful here, using the
     * arguments is not refactoring-safe.
     * 
     * @return the value to be returned
     * @throws Throwable
     *             the throwable to be thrown
     */
    T answer() throws Throwable;
}