Method assert_fail

test/common.py:1316–1320

Just like expect_fail, but also check for expected message in stderr.

(self, cmd, expected, **kwargs)

    return proc.stderr

  def assert_fail(self, cmd, expected, **kwargs):
    """Just like expect_fail, but also check for expected message in stderr."""
    err = self.expect_fail(cmd, **kwargs)
    self.assertContained(expected, err)
    return err

  # exercise dynamic linker.
  #