Example of stacktrace hiding with ExpectedException rule

ExpectedExceptionTest.java

// I'm not sure this is the minimal possible example, edits are welcome

package assertion;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class ExpectedExceptionTest {

  @Rule public final ExpectedException thrown = ExpectedException.none();

  @Test public void shouldFailWithStackTrace() {
    try {
      throw new NullPointerException();
    } finally {
      Assert.assertNull(new Object());
    }
  }

  @Test public void shouldFailWithoutStackTrace() {
    thrown.expect(IllegalArgumentException.class); // Expectation not satisfied
    try {
      throw new NullPointerException();
    } finally {
      Assert.assertNull(new Object());
    }
  }
}

The stack trace still gets printed.