Should we unit test output the console?

I am working with some legacy code that has several commands System.out.printon its own. My eCobertura plugin shows these lines in red, so I want to unit test them.

Here in stackoverflow, I found a way to unit test console outputs that I am very interested in.

Here is how I do it:

        private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();

        @Before
        public void setUpStreams() {
            System.setOut(new PrintStream(outContent));
        }

        @After
        public void cleanUpStreams() {
            System.setOut(null);
        }

        @Test
        public void out() {
            System.out.print("Some message from the system");
            assertEquals("Some message from the system", outContent.toString());
        }

So far so good, the test is green, but when I run the plugin again to cover the code, I get this message:

"Thread-0" java.lang.NullPointerException at net.sourceforge.cobertura.coveragedata.TouchCollector.applyTouchesOnProjectData(TouchCollector.java:186)    net.sourceforge.cobertura.coveragedata.ProjectData.saveGlobalProjectData(ProjectData.java:267)    net.sourceforge.cobertura.coveragedata.SaveTimer.run(SaveTimer.java:31)    java.lang.Thread.run(Thread.java:662)

:

• unit test System.out.print()'s?
• eCoberturain ?
• eCobertura , ?
• - ?
• jUnit 4.11, , - ?
• eCobertura ?