def METHOD_NAME(self):
    ''' Test if IMA prevents overwriting signed files '''
    passed = 0
    failed = 0
    for b in self.binaries:
        if b in blacklist:
            continue
        self.target.run("echo 'foo' >> %s" % b )
        status, output = self.target.run("evmctl ima_verify %s" % b)
        if status != 0:
            failed += 1
        else:
            passed += 1
    if failed == self.total:
         self.fail("Overwritting verifications failed (%s)" % self.total)