#!/usr/bin/env python3
#
# Copyright (C) 2023 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Tests for the fastboot command line utility.
"""

import re
import subprocess
import unittest


class DevicesTest(unittest.TestCase):
    """Tests for `fastboot devices`."""


    def test_devices(self):
        """Ensure that the format of `fastboot devices` does not change.

        `fastboot devices` should alternate between a line containing the
        device's serial number and fastboot state and an empty line
        """
        output = subprocess.check_output(["fastboot", "devices"])

        previous_line_was_empty = True
        for line in output.decode().splitlines():
            if previous_line_was_empty:
                if not re.match(r"[a-zA-Z\d]+\s+(bootloader|fastbootd)", line):
                    self.fail("%s does not match the expected format <serial no>\\s+(bootloader|fastbootd)" % line)
                previous_line_was_empty = False
            else:
                if line:
                    self.fail("Expected an empty line. Received '%s'" % line)
                previous_line_was_empty = True

        if len(output) == 0:
            self.fail("Output is empty. Are any devices connected?")


if __name__ == '__main__':
    unittest.main()
