Junit ErrorCollector usage - failure does not show

Question

I have several assertion and I would like to collect all the problems and finally the whole test should fail with proper console output. But right now, I do not have anything.

    @Rule
    public ErrorCollector collector = new ErrorCollector();
    Matcher<Boolean> matchesTrue = IsEqual.equalTo(true);

collector.checkThat("FAILURE","BLA".equals("OK"), matchesTrue);
collector.checkThat("FAILURE","BLABLA".equals("OK"), matchesTrue);

After the run, everything is green and no error on the console.

What is the problem?

Thanks!

Answer 1

Your code looks valid. The following test ...

public class ErrorCollectorTest {

  @Rule
  public ErrorCollector collector = new ErrorCollector();

  @Test
  public void testErrorCollection() {
    org.hamcrest.Matcher<Boolean> matchesTrue = org.hamcrest.core.IsEqual.equalTo(true);

    collector.checkThat("FAILURE", "BLA".equals("OK"), matchesTrue);
    collector.checkThat("FAILURE", "BLABLA".equals("OK"), matchesTrue);
  }
}

... produces this output:

java.lang.AssertionError: FAILURE
Expected: <true>
     but: was <false>

    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
    at org.junit.Assert.assertThat(Assert.java:956)
    at org.junit.rules.ErrorCollector$1.call(ErrorCollector.java:65)
    at org.junit.rules.ErrorCollector.checkSucceeds(ErrorCollector.java:78)
    at org.junit.rules.ErrorCollector.checkThat(ErrorCollector.java:63)
    ...


java.lang.AssertionError: FAILURE
Expected: <true>
     but: was <false>

    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
    at org.junit.Assert.assertThat(Assert.java:956)
    at org.junit.rules.ErrorCollector$1.call(ErrorCollector.java:65)
    at org.junit.rules.ErrorCollector.checkSucceeds(ErrorCollector.java:78)
    at org.junit.rules.ErrorCollector.checkThat(ErrorCollector.java:63)
    ...

This is verified with JUnit 4.12 and Hamcrest