JUnit5-like assertAll for JUnit4

AssertAll.java

public class AssertAll {
    
  @Rule
    public ErrorCollector collector = new ErrorCollector();

    private void assertAll(Runnable... assertions) {
        Arrays.stream(assertions).forEach(this::runAndCollectThrowable);
    }

    private void runAndCollectThrowable(Runnable runnable) {
        try {
            runnable.run();
        } catch (Throwable throwable) {
            collector.addError(throwable);
        }
    }
}

TestClass.java

public class TestClass {

  @Test
  public void shouldTestSomething() {
    assertAll(
      () -> assertThat(something, is(true)),
      () -> assertThat(anotherThing, is(false))
    );
  }
}