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Testing utility for generating random fixture data

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/**
 * Copyright © 2016 Iterator Ltd. ([email protected])
 *
 * 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 iterator.test.fixtures;

import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

public final class Answers {

  private static class ReturnsParameterIndexAnswer implements Answer {

    private final int i;

    ReturnsParameterIndexAnswer(int i) {
      this.i = i;
    }

    @Override
    @SuppressWarnings("unchecked")
    public T answer(InvocationOnMock invocation) throws Throwable {
      return (T) invocation.getArguments()[i];
    }
  }

  public static  Answer withParameter(int i) {
    return new ReturnsParameterIndexAnswer<>(i);
  }

  private Answers() {
    throw new IllegalStateException();
  }
}