private File waitFor(FileAcquirer fileAcquirer, FileReference reference)
            throws InterruptedException {
        return fileAcquirer.waitFor(reference, 100, TimeUnit.SECONDS);
    }
Test of public API of MockFileAcquirer, since it is intended to be used by 3rd parties.
Do not place it in the same package as MockFileAcquirer.
@author Tony Vaagenes
fileacquirer/src/test/java/MockFileAcquirerTest.java