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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.data.Offset;
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 are equal failed.
 * 
 * @author Yvonne Wang
 */
public class ShouldBeEqualImages extends BasicErrorMessageFactory {

  /**
   * Creates a new {@link ShouldBeEqualImages}.
   * 
   * @param offset helps decide if the color of two pixels are similar: two pixels that are identical to the human eye
   *          may still have slightly different color values. For example, by using an offset of 1 we can indicate that
   *          a blue value of 60 is similar to a blue value of 61.
   * @return the created {@code ErrorMessageFactory}.
   */
  public static ErrorMessageFactory shouldBeEqualImages(Offset offset) {
    return new ShouldBeEqualImages(offset);
  }

  private ShouldBeEqualImages(Offset offset) {
    super("expecting images to be equal within offset:<%s>", offset.value);
  }
}