private void assertContains(boolean assertContains, String expectation, ByteArrayOutputStream bytes) {
String consoleOutput = String.valueOf(bytes.toString());
boolean containsTheSubstring = consoleOutput.contains(expectation);
if(assertContains && !containsTheSubstring || !assertContains && containsTheSubstring){
throw new KoanIncompleteException(new StringBuilder(
"<").append(
expectation).append(
"> ").append(
(assertContains ? "wasn't" : "was")).append(
" found in: " ).append(