"""
mbed SDK
Copyright (c) 2011-2018 ARM Limited

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.
"""

import unittest
import os
import errno
import logging
import re
import json
from io import StringIO
from mock import patch, mock_open, DEFAULT
from copy import deepcopy

from mbed_lstools.lstools_base import MbedLsToolsBase, FSInteraction

class DummyLsTools(MbedLsToolsBase):
    return_value = []
    def find_candidates(self):
        return self.return_value

try:
    basestring
except NameError:
    # Python 3
    basestring = str

class BasicTestCase(unittest.TestCase):
    """ Basic test cases checking trivial asserts
    """

    def setUp(self):
        self.base = DummyLsTools(force_mock=True)

    def tearDown(self):
        pass

    def test_list_mbeds_valid_platform(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port"},
                                  {'mount_point': None,
                                   'target_id_usb_id': '00000000000',
                                   'serial_port': 'not_valid'}]
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids") as _read_htm,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
             patch("mbed_os_tools.detect.platform_database.PlatformDatabase.get") as _get,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _mpr.return_value = True
            _read_htm.return_value = (u'0241BEEFDEAD', {})
            _get.return_value = {
                'platform_name': 'foo_target'
            }
            _listdir.return_value = ['mbed.htm']
            to_check = self.base.list_mbeds()
            _read_htm.assert_called_once_with('dummy_mount_point')
            _get.assert_any_call('0241', device_type='daplink', verbose_data=True)
        self.assertEqual(len(to_check), 1)
        self.assertEqual(to_check[0]['target_id'], "0241BEEFDEAD")
        self.assertEqual(to_check[0]['platform_name'], 'foo_target')

    def test_list_mbeds_invalid_tid(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port"},
                                  {'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': "",
                                   'serial_port': 'not_valid'}]
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids") as _read_htm,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
             patch("mbed_os_tools.detect.platform_database.PlatformDatabase.get") as _get,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _mpr.return_value = True
            _read_htm.side_effect = [(u'0241BEEFDEAD', {}), (None, {})]
            _get.return_value = {
                'platform_name': 'foo_target'
            }
            _listdir.return_value = ['mbed.htm']
            to_check = self.base.list_mbeds()
            _get.assert_any_call('0241', device_type='daplink', verbose_data=True)
        self.assertEqual(len(to_check), 2)
        self.assertEqual(to_check[0]['target_id'], "0241BEEFDEAD")
        self.assertEqual(to_check[0]['platform_name'], 'foo_target')
        self.assertEqual(to_check[1]['target_id'], "")
        self.assertEqual(to_check[1]['platform_name'], None)

    def test_list_mbeds_invalid_platform(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'not_in_target_db',
                                   'serial_port': "dummy_serial_port"}]
        for qos in [FSInteraction.BeforeFilter, FSInteraction.AfterFilter]:
            with patch("mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids") as _read_htm,\
                patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
                patch("mbed_os_tools.detect.platform_database.PlatformDatabase.get") as _get,\
                patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
                _mpr.return_value = True
                _read_htm.return_value = (u'not_in_target_db', {})
                _get.return_value = None
                _listdir.return_value = ['MBED.HTM']
                to_check = self.base.list_mbeds()
                _read_htm.assert_called_once_with('dummy_mount_point')
                _get.assert_any_call('not_', device_type='daplink', verbose_data=True)
            self.assertEqual(len(to_check), 1)
            self.assertEqual(to_check[0]['target_id'], "not_in_target_db")
            self.assertEqual(to_check[0]['platform_name'], None)

    def test_list_mbeds_unmount_mid_read(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port"}]
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _mpr.return_value = True
            _listdir.side_effect = OSError
            to_check = self.base.list_mbeds()
        self.assertEqual(len(to_check), 0)

    def test_list_mbeds_read_mbed_htm_failure(self):
        def _test(mock):
            self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                       'target_id_usb_id': u'0240DEADBEEF',
                                       'serial_port': "dummy_serial_port"}]
            with patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
                 patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir,\
                 patch('mbed_os_tools.detect.lstools_base.open', mock, create=True):
                _mpr.return_value = True
                _listdir.return_value = ['MBED.HTM', 'DETAILS.TXT']
                to_check = self.base.list_mbeds()
                mock.assert_called_once_with(os.path.join('dummy_mount_point', 'mbed.htm'), 'r')
                self.assertEqual(len(to_check), 0)

        m = mock_open()
        m.side_effect = OSError
        _test(m)

        m.reset_mock()
        m.side_effect = IOError
        _test(m)

    def test_list_mbeds_read_no_mbed_htm(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port"}]

        details_txt_contents = '''\
# DAPLink Firmware - see https://mbed.com/daplink
Unique ID: 0240000032044e4500257009997b00386781000097969900
HIC ID: 97969900
Auto Reset: 0
Automation allowed: 1
Overflow detection: 1
Daplink Mode: Interface
Interface Version: 0246
Bootloader Version: 0244
Git SHA: 0beabef8aa4b382809d79e98321ecf6a28936812
Local Mods: 0
USB Interfaces: MSD, CDC, HID
Bootloader CRC: 0xb92403e6
Interface CRC: 0x434eddd1
Remount count: 0
'''
        def _handle_open(*args, **kwargs):
            if args[0].lower() == os.path.join('dummy_mount_point', 'mbed.htm'):
                raise OSError("(mocked open) No such file or directory: 'mbed.htm'")
            else:
                return DEFAULT

        m = mock_open(read_data=details_txt_contents)
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir,\
             patch('mbed_os_tools.detect.lstools_base.open', m, create=True) as mocked_open:
            mocked_open.side_effect = _handle_open
            _mpr.return_value = True
            _listdir.return_value = ['PRODINFO.HTM', 'DETAILS.TXT']
            to_check = self.base.list_mbeds()
            self.assertEqual(len(to_check), 1)
            m.assert_called_once_with(os.path.join('dummy_mount_point', 'DETAILS.TXT'), 'r')
            self.assertEqual(to_check[0]['target_id'], '0240000032044e4500257009997b00386781000097969900')

    def test_list_mbeds_read_details_txt_failure(self):
        def _test(mock):
            self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                       'target_id_usb_id': u'0240DEADBEEF',
                                       'serial_port': "dummy_serial_port"}]
            with patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
                 patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir,\
                 patch("mbed_lstools.lstools_base.MbedLsToolsBase._update_device_from_htm") as _htm,\
                 patch('mbed_os_tools.detect.lstools_base.open', mock, create=True):
                _mpr.return_value = True
                _htm.side_effect = None
                _listdir.return_value = ['MBED.HTM', 'DETAILS.TXT']
                to_check = self.base.list_mbeds(read_details_txt=True)
                mock.assert_called_once_with(os.path.join('dummy_mount_point', 'DETAILS.TXT'), 'r')
                self.assertEqual(len(to_check), 0)

        m = mock_open()
        m.side_effect = OSError
        _test(m)

        m.reset_mock()
        m.side_effect = IOError
        _test(m)

    def test_list_mbeds_unmount_mid_read_list_unmounted(self):
        self.base.list_unmounted = True
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port"}]
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as _mpr,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _mpr.return_value = True
            _listdir.side_effect = OSError
            to_check = self.base.list_mbeds()
        self.assertEqual(len(to_check), 1)
        self.assertEqual(to_check[0]['mount_point'], None)
        self.assertEqual(to_check[0]['device_type'], 'unknown')
        self.assertEqual(to_check[0]['platform_name'], 'K64F')

    def test_list_manufacture_ids(self):
        table_str = self.base.list_manufacture_ids()
        self.assertTrue(isinstance(table_str, basestring))

    def test_mock_manufacture_ids_default_multiple(self):
        # oper='+'
        for mid, platform_name in [('0341', 'TEST_PLATFORM_NAME_1'),
                                   ('0342', 'TEST_PLATFORM_NAME_2'),
                                   ('0343', 'TEST_PLATFORM_NAME_3')]:
            self.base.mock_manufacture_id(mid, platform_name)
            self.assertEqual(platform_name, self.base.plat_db.get(mid))

    def test_mock_manufacture_ids_minus(self):
        # oper='+'
        for mid, platform_name in [('0341', 'TEST_PLATFORM_NAME_1'),
                                   ('0342', 'TEST_PLATFORM_NAME_2'),
                                   ('0343', 'TEST_PLATFORM_NAME_3')]:
            self.base.mock_manufacture_id(mid, platform_name)
            self.assertEqual(platform_name, self.base.plat_db.get(mid))

        # oper='-'
        mock_ids = self.base.mock_manufacture_id('0342', '', oper='-')
        self.assertEqual('TEST_PLATFORM_NAME_1', self.base.plat_db.get("0341"))
        self.assertEqual(None, self.base.plat_db.get("0342"))
        self.assertEqual('TEST_PLATFORM_NAME_3', self.base.plat_db.get("0343"))

    def test_mock_manufacture_ids_star(self):
        # oper='+'
        for mid, platform_name in [('0341', 'TEST_PLATFORM_NAME_1'),
                                   ('0342', 'TEST_PLATFORM_NAME_2'),
                                   ('0343', 'TEST_PLATFORM_NAME_3')]:
            self.base.mock_manufacture_id(mid, platform_name)

            self.assertEqual(platform_name, self.base.plat_db.get(mid))

        # oper='-'
        self.base.mock_manufacture_id('*', '', oper='-')
        self.assertEqual(None, self.base.plat_db.get("0341"))
        self.assertEqual(None, self.base.plat_db.get("0342"))
        self.assertEqual(None, self.base.plat_db.get("0343"))

    def test_update_device_from_fs_mid_unmount(self):
        dummy_mount = 'dummy_mount'
        device = {
            'mount_point': dummy_mount
        }

        with patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _listdir.side_effect = OSError
            self.base._update_device_from_fs(device, False)
            self.assertEqual(device['mount_point'], None)

    def test_detect_device_test(self):
        device_type = self.base._detect_device_type({
            'vendor_id': '0483'
        })
        self.assertEqual(device_type, 'stlink')

        device_type = self.base._detect_device_type({
            'vendor_id': '0d28'
        })
        self.assertEqual(device_type, 'daplink')

        device_type = self.base._detect_device_type({
            'vendor_id': '1366'
        })
        self.assertEqual(device_type, 'jlink')

    def test_device_type_unmounted(self):
        self.base.list_unmounted = True
        self.base.return_value = [{'mount_point': None,
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': "dummy_serial_port",
                                   'vendor_id': '0d28',
                                   'product_id': '0204'}]
        with patch("mbed_os_tools.detect.platform_database.PlatformDatabase.get") as _get,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _get.return_value = {
                'platform_name': 'foo_target'
            }
            to_check = self.base.list_mbeds()
            #_get.assert_any_call('0240', device_type='daplink', verbose_data=True)
        self.assertEqual(len(to_check), 1)
        self.assertEqual(to_check[0]['target_id'], "0240DEADBEEF")
        self.assertEqual(to_check[0]['platform_name'], 'foo_target')
        self.assertEqual(to_check[0]['device_type'], 'daplink')

    def test_update_device_details_jlink(self):
        jlink_html_contents = ('<html><head><meta http-equiv="refresh" '
                               'content="0; url=http://www.nxp.com/FRDM-KL27Z"/>'
                               '<title>NXP Product Page</title></head><body></body></html>')
        _open = mock_open(read_data=jlink_html_contents)
        dummy_mount_point = 'dummy'
        base_device = {
            'mount_point': dummy_mount_point
        }

        with patch('mbed_os_tools.detect.lstools_base.open', _open, create=True):
            device = deepcopy(base_device)
            device['directory_entries'] = ['Board.html', 'User Guide.html']
            self.base._update_device_details_jlink(device, False)
            self.assertEqual(device['url'], 'http://www.nxp.com/FRDM-KL27Z')
            self.assertEqual(device['platform_name'], 'KL27Z')
            _open.assert_called_once_with(os.path.join(dummy_mount_point, 'Board.html'), 'r')

            _open.reset_mock()

            device = deepcopy(base_device)
            device['directory_entries'] = ['User Guide.html']
            self.base._update_device_details_jlink(device, False)
            self.assertEqual(device['url'], 'http://www.nxp.com/FRDM-KL27Z')
            self.assertEqual(device['platform_name'], 'KL27Z')
            _open.assert_called_once_with(os.path.join(dummy_mount_point, 'User Guide.html'), 'r')

            _open.reset_mock()

            device = deepcopy(base_device)
            device['directory_entries'] = ['unhelpful_file.html']
            self.base._update_device_details_jlink(device, False)
            _open.assert_not_called()

    def test_fs_never(self):
        device = {
            'target_id_usb_id': '024075309420ABCE',
            'mount_point': 'invalid_mount_point',
            'serial_port': 'invalid_serial_port'
        }
        self.base.return_value = [device]
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase._update_device_from_fs") as _up_fs,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as mount_point_ready:
            mount_point_ready.return_value = True

            filter = None
            ret = self.base.list_mbeds(FSInteraction.Never, filter, read_details_txt=False)
            ret_with_details = self.base.list_mbeds(FSInteraction.Never, filter, read_details_txt=True)
            self.assertIsNotNone(ret[0])
            self.assertIsNotNone(ret_with_details[0])
            self.assertEqual(ret[0]['target_id'], ret[0]['target_id_usb_id'])
            self.assertEqual(ret[0]['platform_name'], "K64F")
            self.assertEqual(ret[0], ret_with_details[0])
            _up_fs.assert_not_called()

            filter_in = lambda m: m['platform_name'] == 'K64F'
            ret = self.base.list_mbeds(FSInteraction.Never, filter_in, read_details_txt=False)
            ret_with_details = self.base.list_mbeds(FSInteraction.Never, filter_in, read_details_txt=True)
            self.assertIsNotNone(ret[0])
            self.assertIsNotNone(ret_with_details[0])
            self.assertEqual(ret[0]['target_id'], ret[0]['target_id_usb_id'])
            self.assertEqual(ret[0]['platform_name'], "K64F")
            self.assertEqual(ret[0], ret_with_details[0])
            _up_fs.assert_not_called()

            filter_out = lambda m: m['platform_name'] != 'K64F'
            ret = self.base.list_mbeds(FSInteraction.Never, filter_out, read_details_txt=False)
            ret_with_details = self.base.list_mbeds(FSInteraction.Never, filter_out, read_details_txt=True)
            _up_fs.assert_not_called()
            self.assertEqual(ret, [])
            self.assertEqual(ret, ret_with_details)
            _up_fs.assert_not_called()

    def test_fs_after(self):
        device = {
            'target_id_usb_id': '024075309420ABCE',
            'mount_point': 'invalid_mount_point',
            'serial_port': 'invalid_serial_port'
        }
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids") as _read_htm,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase._details_txt") as _up_details,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as mount_point_ready,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            new_device_id = "00017531642046"
            _read_htm.return_value = (new_device_id, {})
            _listdir.return_value = ['mbed.htm', 'details.txt']
            _up_details.return_value = {
                'automation_allowed': '0'
            }
            mount_point_ready.return_value = True

            filter = None
            self.base.return_value = [deepcopy(device)]
            ret = self.base.list_mbeds(FSInteraction.AfterFilter, filter, False, False)
            _up_details.assert_not_called()
            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(FSInteraction.AfterFilter, filter, False, True)

            self.assertIsNotNone(ret[0])
            self.assertIsNotNone(ret_with_details[0])
            self.assertEqual(ret[0]['target_id'], new_device_id)
            self.assertEqual(ret_with_details[0]['daplink_automation_allowed'], '0')
            self.assertDictContainsSubset(ret[0], ret_with_details[0])
            _read_htm.assert_called_with(device['mount_point'])
            _up_details.assert_called_with(device['mount_point'])

            _read_htm.reset_mock()
            _up_details.reset_mock()

            filter_in = lambda m: m['target_id'] == device['target_id_usb_id']
            filter_details = lambda m: m.get('daplink_automation_allowed', None) == '0'

            self.base.return_value = [deepcopy(device)]
            ret = self.base.list_mbeds(
                FSInteraction.AfterFilter, filter_in, False, False)
            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(
                FSInteraction.AfterFilter, filter_details, False, True)

            self.assertIsNotNone(ret[0])
            self.assertEqual(ret_with_details, [])
            self.assertEqual(ret[0]['target_id'], new_device_id)
            _read_htm.assert_called_with(device['mount_point'])
            _up_details.assert_not_called()

            _read_htm.reset_mock()
            _up_details.reset_mock()

            filter_out = lambda m: m['target_id'] == new_device_id

            self.base.return_value = [deepcopy(device)]
            ret = self.base.list_mbeds(
                FSInteraction.AfterFilter, filter_out, False, False)
            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(
                FSInteraction.AfterFilter, filter_out, False, True)

            self.assertEqual(ret, [])
            self.assertEqual(ret_with_details, [])
            _read_htm.assert_not_called()
            _up_details.assert_not_called()

    def test_get_supported_platforms(self):
        supported_platforms = self.base.get_supported_platforms()
        self.assertTrue(isinstance(supported_platforms, dict))
        self.assertEqual(supported_platforms['0240'], 'K64F')

    def test_fs_before(self):
        device = {
            'target_id_usb_id': '024075309420ABCE',
            'mount_point': 'invalid_mount_point',
            'serial_port': 'invalid_serial_port'
        }
        with patch("mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids") as _read_htm,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase._details_txt") as _up_details,\
             patch("mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready") as mount_point_ready,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            new_device_id = u'00017575430420'
            _read_htm.return_value = (new_device_id, {})
            _listdir.return_value = ['mbed.htm', 'details.txt']
            _up_details.return_value = {
                'automation_allowed': '0'
            }
            mount_point_ready.return_value = True

            filter = None
            self.base.return_value = [deepcopy(device)]
            ret = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter, False, False)
            _up_details.assert_not_called()

            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter, False, True)
            self.assertIsNotNone(ret[0])
            self.assertIsNotNone(ret_with_details[0])
            self.assertEqual(ret[0]['target_id'], new_device_id)
            self.assertEqual(ret_with_details[0]['daplink_automation_allowed'], '0')
            self.assertDictContainsSubset(ret[0], ret_with_details[0])
            _read_htm.assert_called_with(device['mount_point'])
            _up_details.assert_called_with(device['mount_point'])

            _read_htm.reset_mock()
            _up_details.reset_mock()

            filter_in = lambda m: m['target_id'] == '00017575430420'
            filter_in_details = lambda m: m['daplink_automation_allowed'] == '0'
            self.base.return_value = [deepcopy(device)]
            ret = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter_in, False, False)
            _up_details.assert_not_called()

            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter_in_details, False, True)

            self.assertIsNotNone(ret[0])
            self.assertIsNotNone(ret_with_details[0])
            self.assertEqual(ret[0]['target_id'], new_device_id)
            self.assertEqual(ret_with_details[0]['daplink_automation_allowed'], '0')
            self.assertDictContainsSubset(ret[0], ret_with_details[0])
            _read_htm.assert_called_with(device['mount_point'])
            _up_details.assert_called_with(device['mount_point'])

            _read_htm.reset_mock()
            _up_details.reset_mock()

            filter_out = lambda m: m['target_id'] == '024075309420ABCE'
            filter_out_details = lambda m: m['daplink_automation_allowed'] == '1'
            ret = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter_out, False, False)
            _up_details.assert_not_called()

            self.base.return_value = [deepcopy(device)]
            ret_with_details = self.base.list_mbeds(
                FSInteraction.BeforeFilter, filter_out_details, False, True)

            self.assertEqual(ret, [])
            self.assertEqual(ret_with_details, [])
            _read_htm.assert_called_with(device['mount_point'])

class RetargetTestCase(unittest.TestCase):
    """ Test cases that makes use of retargetting
    """

    def setUp(self):
        retarget_data = {
            '0240DEADBEEF': {
                'serial_port' : 'valid'
            }
        }

        _open = mock_open(read_data=json.dumps(retarget_data))

        with patch('os.path.isfile') as _isfile,\
             patch('mbed_os_tools.detect.lstools_base.isfile') as _isfile,\
             patch('mbed_os_tools.detect.lstools_base.open', _open, create=True):
            _isfile.return_value = True
            self.base = DummyLsTools()
            _open.assert_called()

    def tearDown(self):
        pass

    def test_list_mbeds_valid_platform(self):
        self.base.return_value = [{'mount_point': 'dummy_mount_point',
                                   'target_id_usb_id': u'0240DEADBEEF',
                                   'serial_port': None}]
        with patch('mbed_lstools.lstools_base.MbedLsToolsBase._read_htm_ids') as _read_htm,\
             patch('mbed_lstools.lstools_base.MbedLsToolsBase.mount_point_ready') as _mpr,\
             patch('mbed_os_tools.detect.platform_database.PlatformDatabase.get') as _get,\
             patch("mbed_os_tools.detect.lstools_base.listdir") as _listdir:
            _mpr.return_value = True
            _read_htm.return_value = (u'0240DEADBEEF', {})
            _get.return_value = {
                'platform_name': 'foo_target'
            }
            _listdir.return_value = ['mbed.htm']
            to_check = self.base.list_mbeds()
        self.assertEqual(len(to_check), 1)
        self.assertEqual(to_check[0]['serial_port'], 'valid')

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