in src/main/org/apache/ant/antunit/AssertTask.java [66:75]
public void execute() throws BuildException {
int count = countConditions();
if (count > 1) {
throw new BuildException("You must not specify more than one "
+ "condition", getLocation());
}
if (count < 1 || !((Condition) getConditions().nextElement()).eval()) {
throw new AssertionFailedException(message, getLocation());
}
}