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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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package org.junit.internal;

import java.util.ArrayList;
import java.util.List;

import org.junit.Assert;

/**
 * Thrown when two array elements differ
 * @see Assert#assertArrayEquals(String, Object[], Object[])
 */
public class ArrayComparisonFailure extends AssertionError {

	private static final long serialVersionUID= 1L;
	
	private List fIndices= new ArrayList();
	private final String fMessage;
	private final AssertionError fCause;

	/**
	 * Construct a new ArrayComparisonFailure with an error text and the array's
	 * dimension that was not equal
	 * @param cause the exception that caused the array's content to fail the assertion test 
	 * @param index the array position of the objects that are not equal.
	 * @see Assert#assertArrayEquals(String, Object[], Object[])
	 */
	public ArrayComparisonFailure(String message, AssertionError cause, int index) {
		fMessage= message;
		fCause= cause;
		addDimension(index);
	}

	public void addDimension(int index) {
		fIndices.add(0, index);
	}

	@Override
	public String getMessage() {
		StringBuilder builder= new StringBuilder();
		if (fMessage != null)
			builder.append(fMessage);
		builder.append("arrays first differed at element ");
		for (int each : fIndices) {
			builder.append("[");
			builder.append(each);
			builder.append("]");
		}
		builder.append("; ");
		builder.append(fCause.getMessage());
		return builder.toString();
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override public String toString() {
		return getMessage();
	}
}