public void testToxenvPatternBlank() throws Exception {
   configureCPython2();
   ToxBuilder builder = new ToxBuilder("tox.ini", false, "$FOOBAR");
   MatrixProject project = createMatrixProject();
   AxisList axes = new AxisList(new TextAxis("FOOBAR2", "badluck"));
   project.setScm(new ToxSCM("tox.ini", "[testenv]\ncommand = echo"));
   project.setAxes(axes);
   project.getBuildersList().add(builder);
   MatrixBuild build = project.scheduleBuild2(0).get();
   List<MatrixRun> runs = build.getRuns();
   assertEquals(1, runs.size());
   MatrixRun run = runs.get(0);
   String log = FileUtils.readFileToString(run.getLogFile());
   System.out.println(log);
   assertTrue(
       "should not be able to run with a blank TOXENV pattern:\n" + log,
       log.contains(Messages.ToxBuilder_ToxenvPattern_Invalid("$FOOBAR")));
 }