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Fluent interface for functional GUI testing

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/**
 * 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.
 *
 * Copyright 2012-2015 the original author or authors.
 */
package org.assertj.swing.assertions.error;

import org.assertj.core.error.BasicErrorMessageFactory;
import org.assertj.core.error.ErrorMessageFactory;

/**
 * Creates an error message that indicates an assertion that verifies that two images should not be {@code null} failed.
 * 
 * @author Yvonne Wang
 */
public class ShouldNotBeEqualImages extends BasicErrorMessageFactory {

  private static final ShouldNotBeEqualImages INSTANCE = new ShouldNotBeEqualImages();

  /**
   * Returns the singleton instance of this class.
   * 
   * @return the singleton instance of this class.
   */
  public static ErrorMessageFactory shouldNotBeEqualImages() {
    return INSTANCE;
  }

  private ShouldNotBeEqualImages() {
    super("expecting images not to be equal");
  }
}