How to force JUnit to display all errors?

public class AssertsAccumulator { private boolean assertsPassed; private StringBuilder errors; /** * Initializes a new instance of the class. * <pre> * {@code AssertsAccumulator assertsAccumulator = new AssertsAccumulator(); * assertsAccumulator.accumulate(() -> assertNotNull(null)); * assertsAccumulator.release(); * } </pre> * @see AssertsAccumulator */ public AssertsAccumulator() { this.errors = new StringBuilder(); this.assertsPassed = true; } /** * Gets Regularly updates progress on a given task. * Should be invoked every time task.ProgressValue or task.MaxProgressValue changes */ public String getAccumulatedErrorMessage() { return this.errors.toString(); } /** * value indicating whether assert passed or failed. * @return <c>true</c> if assert passed, <c>false</c> otherwise. */ public boolean isAssertsPassed() { return assertsPassed; } /** * Regularly updates progress on a given task. * Should be invoked every time task.ProgressValue or task.MaxProgressValue changes */ public void release() { if (!this.assertsPassed) { throw new AssertionError(this.getAccumulatedErrorMessage()); } } /** * updates progress on a given task. * be invoked every time task.ProgressValue or task.MaxProgressValue changes * * @param action Action for run */ public void accumulate(Runnable action) { try { action.run(); } catch (AssertionError e) { this.registerError(e); } catch (Exception exception) { this.registerError(exception); } } public void accumulate(Runnable action, String key) { try { action.run(); } catch (AssertionError e) { this.registerError( } catch (Exception exception) { this.registerError(exception); } } /** * Regularly updates progress on a given task. * Should be invoked every time task.ProgressValue or task.MaxProgressValue changes */ private void registerError(Throwable e) { this.assertsPassed = false; this.errors.append(e.getMessage() + "\n" + stackTraceToString(e)); this.errors.append(Messages.getLineSeperator("~", 40)); this.errors.append(System.lineSeparator()); } private String stackTraceToString(Throwable e) { StringBuilder sb = new StringBuilder(); int k = 0; for (StackTraceElement element : e.getStackTrace()) { sb.append(element.toString()); sb.append("\n"); if (k > 5) break; k++; } return sb.toString(); } 

use so

 AssertsAccumulator accumulator = new AssertsAccumulator(); accumulator.accumulate(() -> Assert.fail())); accumulator.accumulate(() -> Assert.fail("Message"))); accumulator.release();