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package org.junit.runners.model;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.junit.internal.Throwables;
/**
* Collects multiple {@code Throwable}s into one exception.
*
* @since 4.9
*/
public class MultipleFailureException extends Exception {
private static final long serialVersionUID = 1L;
/*
* We have to use the f prefix until the next major release to ensure
* serialization compatibility.
* See https://github.com/junit-team/junit/issues/976
*/
private final List<Throwable> fErrors;
public MultipleFailureException(List<Throwable> errors) {
this.fErrors = new ArrayList<Throwable>(errors);
}
public List<Throwable> getFailures() {
return Collections.unmodifiableList(fErrors);
}
@Override
public String getMessage() {
StringBuilder sb = new StringBuilder(
String.format("There were %d errors:", fErrors.size()));
for (Throwable e : fErrors) {
sb.append(String.format("\n %s(%s)", e.getClass().getName(), e.getMessage()));
}
return sb.toString();
}
/**
* Asserts that a list of throwables is empty. If it isn't empty,
* will throw {@link MultipleFailureException} (if there are
* multiple throwables in the list) or the first element in the list
* (if there is only one element).
*
* @param errors list to check
* @throws Exception or Error if the list is not empty
*/
@SuppressWarnings("deprecation")
public static void assertEmpty(List<Throwable> errors) throws Exception {
if (errors.isEmpty()) {
return;
}
if (errors.size() == 1) {
throw Throwables.rethrowAsException(errors.get(0));
}
/*
* Many places in the code are documented to throw
* org.junit.internal.runners.model.MultipleFailureException.
* That class now extends this one, so we throw the internal
* exception in case developers have tests that catch
* MultipleFailureException.
*/
throw new org.junit.internal.runners.model.MultipleFailureException(errors);
}
}
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