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Source code of the class part of junit version 4.12

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package org.junit.experimental.theories.internal;

import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

public class ParameterizedAssertionError extends AssertionError {
    private static final long serialVersionUID = 1L;

    public ParameterizedAssertionError(Throwable targetException,
            String methodName, Object... params) {
        super(String.format("%s(%s)", methodName, join(", ", params)));

    public boolean equals(Object obj) {
        return obj instanceof ParameterizedAssertionError && toString().equals(obj.toString());

    public int hashCode() {
        return toString().hashCode();

    public static String join(String delimiter, Object... params) {
        return join(delimiter, Arrays.asList(params));

    public static String join(String delimiter, Collection values) {
        StringBuilder sb = new StringBuilder();
        Iterator iter = values.iterator();
        while (iter.hasNext()) {
            Object next =;
            if (iter.hasNext()) {
        return sb.toString();

    private static String stringValueOf(Object next) {
        try {
            return String.valueOf(next);
        } catch (Throwable e) {
            return "[toString failed]";