@Test(expected = MojoFailureException.class)
public void testCollectReports_addThrows() throws Exception {

    final File testOutDir = new File(testOutBaseDir, "testCollectReports_addThrows");
    FileUtils.deleteDirectory(testOutDir);
    testOutDir.mkdirs();
    VerifyMojo mojo = new VerifyMojo();
    final File summaryFile = new File(testOutDir, "summary.json");
    final File addSummaryFile = new File(testOutDir, "summary2.json");
    addSummaryFile.mkdirs();
    mojo.summaryFile = summaryFile;
    mojo.summaryFiles.add(addSummaryFile);
    mojo.collectReports();
}