I run the following test in my Eclipse (with arguments -ea):
public class ColorHelperTest { @Rule public ExpectedException thrown = ExpectedException.none(); @Test public void testGetColorByString() { thrown.expect(AssertionError.class); assert 1 == 2; } } The output is:
java.lang.AssertionError at de.*.*.*.mytests.ColorHelperTest.testGetColorByString(ColorHelperTest.java:28) 28 is the line assert 1==2
Why does this test fail?
You cannot "expect" AssertionError, this is the specific type of error that JUnit uses to signal that the test is failing.
Update: Turns out it's a bug of JUnit 4.11, and it was resolved in 4.12: https://github.com/junit-team/junit/blob/master/doc/ReleaseNotes4.12.md#pull-request-583-pull-request-720-fix-handling-of-assertionerror-and-assumptionviolatedexception-in-expectedexception-rule
The assert keyword is a JRE level flag and has nothing to do with JUnit. I think what you're really looking for is:
assertEquals(1, 2); 
Interesting... What version of Junit you use? Using 4.12 (in my pom.xml looks like:
<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> the exact same test works for me.
-ea flag? Without it, the assert keyword is ignored.