in src/main/java/org/apache/maven/shared/verifier/Verifier.java [310:320]
public void verify(boolean chokeOnErrorOutput) throws VerificationException {
List<String> lines = loadFile(getBasedir(), "expected-results.txt", false);
for (String line : lines) {
verifyExpectedResult(line);
}
if (chokeOnErrorOutput) {
verifyErrorFreeLog();
}
}