pd-buddy-python/test_pdbuddy/__init__.py

"""Unit tests for the top-level pdbuddy classes"""

import unittest

import pdbuddy


class SinkTestCase(unittest.TestCase):

    def setUp(self):
        # Get devices
        pdbs_devices = list(pdbuddy.Sink.get_devices())
        # If there are no devices, skip the test
        if len(pdbs_devices) == 0:
            self.skipTest("No PD Buddy Sink devices found")
        # Open the first device
        self.pdbs = pdbuddy.Sink(pdbs_devices[0])

        self.obj_valid = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=15000, vmin=None, vmax=None,
                i=3000)
        self.obj_valid_gb = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.GIVEBACK, v=15000, vmin=None,
                vmax=None, i=3000)

        self.obj_huge_v = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=65536, vmin=None, vmax=None,
                i=1000)
        self.obj_big_v = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=21001, vmin=None, vmax=None,
                i=1000)
        self.obj_neg_v = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=-1, vmin=None, vmax=None,
                i=1000)

        self.obj_huge_i = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=5000, vmin=None, vmax=None,
                i=65536)
        self.obj_big_i = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=5000, vmin=None, vmax=None,
                i=5001)
        self.obj_neg_i = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=5000, vmin=None, vmax=None,
                i=-1)

    def tearDown(self):
        # Close the connection to the PD Buddy Sink
        self.pdbs.close()

    def test_identify(self):
        self.pdbs.identify()

    def test_help(self):
        help_text = self.pdbs.help()
        self.assertTrue(len(help_text) > 0)
        self.assertTrue(len(help_text[0]) > 0)

    def test_license(self):
        license_text = self.pdbs.license()
        self.assertTrue(len(license_text) > 0)
        self.assertTrue(len(license_text[0]) > 0)

    def test_set_tmpcfg_valid(self):
        self.pdbs.set_tmpcfg(self.obj_valid)
        self.assertEqual(self.pdbs.get_tmpcfg(), self.obj_valid)

    def test_set_tmpcfg_valid_gb(self):
        self.pdbs.set_tmpcfg(self.obj_valid_gb)
        self.assertEqual(self.pdbs.get_tmpcfg(), self.obj_valid_gb)

    def test_set_tmpcfg_huge_v(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_huge_v)

    def test_set_tmpcfg_big_v(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_big_v)

    def test_set_tmpcfg_neg_v(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_neg_v)

    def test_set_tmpcfg_huge_i(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_huge_i)

    def test_set_tmpcfg_big_i(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_big_i)

    def test_set_tmpcfg_neg_i(self):
        with self.assertRaises(ValueError):
            self.pdbs.set_tmpcfg(self.obj_neg_i)

    def test_write(self):
        self.test_set_tmpcfg_valid()
        self.pdbs.write()
        self.assertEqual(self.pdbs.get_cfg(), self.obj_valid)

    def test_get_cfg_index(self):
        self.assertIsInstance(self.pdbs.get_cfg(0), pdbuddy.SinkConfig)

    def test_get_cfg_index_bad(self):
        with self.assertRaises(IndexError):
            self.pdbs.get_cfg(-1)

    def test_load(self):
        # Write obj_valid to flash
        self.test_write()
        # Write obj_valid_gb to tmpcfg
        self.test_set_tmpcfg_valid_gb()

        self.assertNotEqual(self.pdbs.get_cfg(), self.pdbs.get_tmpcfg())

        # Load flash to tmpcfg
        self.pdbs.load()

        self.assertEqual(self.pdbs.get_cfg(), self.pdbs.get_tmpcfg())

    def test_erase(self):
        self.pdbs.erase()
        with self.assertRaises(KeyError):
            self.pdbs.load()

    def test_context_manager(self):
        self.pdbs.close()
        with pdbuddy.Sink(list(pdbuddy.Sink.get_devices())[0]) as pdbs:
            # Test something with the conext manager.  For example, this is
            # essentially test_get_cfg_index.
            self.assertIsInstance(pdbs.get_cfg(0), pdbuddy.SinkConfig)

    def test_output(self):
        try:
            self.pdbs.output = False
            self.assertFalse(self.pdbs.output)

            self.pdbs.output = True
            self.assertTrue(self.pdbs.output)
        except KeyError:
            self.skipTest("Command output not supported")
        except ValueError:
            self.skipTest("Unknown value returned by PD Buddy Sink")

    def test_get_source_cap(self):
        self.assertIsInstance(self.pdbs.get_source_cap(), list)

    def test_send_command_invalid(self):
        with self.assertRaises(KeyError):
            self.pdbs.send_command("foo bar")


class SinkConfigTestCase(unittest.TestCase):

    def setUp(self):
        self.obj_none = pdbuddy.SinkConfig(status=None, flags=None, v=None,
                vmin=None, vmax=None, i=None)
        self.obj_empty = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.EMPTY,
                flags=None, v=None, vmin=None, vmax=None, i=None)
        self.obj_valid = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=15000, vmin=None, vmax=None,
                i=3000)
        self.obj_invalid = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.INVALID,
                flags=pdbuddy.SinkFlags.NONE, v=15000, vmin=None, vmax=None,
                i=3000)
        self.obj_valid_gb = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.GIVEBACK, v=15000, vmin=None,
                vmax=None, i=3000)
        self.obj_valid_5v = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=5000, vmin=None, vmax=None,
                i=3000)
        self.obj_valid_1a = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=15000, vmin=None, vmax=None,
                i=1000)
        self.obj_valid_range = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.NONE, v=15000, vmin=12000, vmax=16000,
                i=1000)
        self.obj_valid_hv = pdbuddy.SinkConfig(status=pdbuddy.SinkStatus.VALID,
                flags=pdbuddy.SinkFlags.HV_PREFERRED, v=15000, vmin=12000,
                vmax=16000, i=1000)

    def test_str_none(self):
        self.assertEqual(str(self.obj_none), "No configuration")

    def test_str_empty(self):
        self.assertEqual(str(self.obj_empty), "status: empty")

    def test_str_valid(self):
        self.assertEqual(str(self.obj_valid),
                "status: valid\nflags: (none)\nv: 15.000 V\ni: 3.00 A")

    def test_str_invalid(self):
        self.assertEqual(str(self.obj_invalid),
                "status: invalid\nflags: (none)\nv: 15.000 V\ni: 3.00 A")

    def test_str_valid_gb(self):
        self.assertEqual(str(self.obj_valid_gb),
                "status: valid\nflags: GiveBack\nv: 15.000 V\ni: 3.00 A")

    def test_str_valid_5v(self):
        self.assertEqual(str(self.obj_valid_5v),
                "status: valid\nflags: (none)\nv: 5.000 V\ni: 3.00 A")

    def test_str_valid_1a(self):
        self.assertEqual(str(self.obj_valid_1a),
                "status: valid\nflags: (none)\nv: 15.000 V\ni: 1.00 A")

    def test_str_valid_range(self):
        self.assertEqual(str(self.obj_valid_range),
                "status: valid\nflags: (none)\nv: 15.000 V\nvmin: 12.000 V\n"
                "vmax: 16.000 V\ni: 1.00 A")

    def test_str_valid_hv(self):
        self.assertEqual(str(self.obj_valid_hv),
                "status: valid\nflags: HV_Preferred\nv: 15.000 V\n"
                "vmin: 12.000 V\nvmax: 16.000 V\ni: 1.00 A")

    def test_from_text_none(self):
        ft_none = pdbuddy.SinkConfig.from_text([])
        self.assertEqual(ft_none, self.obj_none)

    def test_from_text_empty(self):
        ft_empty = pdbuddy.SinkConfig.from_text([b"status: empty"])
        self.assertEqual(ft_empty, self.obj_empty)

    def test_from_text_valid(self):
        ft_valid = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: (none)",
                b"v: 15.000 V",
                b"i: 3.00 A"])
        self.assertEqual(ft_valid, self.obj_valid)

    def test_from_text_invalid(self):
        ft_invalid = pdbuddy.SinkConfig.from_text([b"status: invalid",
                b"flags: (none)",
                b"v: 15.000 V",
                b"i: 3.00 A"])
        self.assertEqual(ft_invalid, self.obj_invalid)

    def test_from_text_valid_gb(self):
        ft_valid_gb = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: GiveBack",
                b"v: 15.000 V",
                b"i: 3.00 A"])
        self.assertEqual(ft_valid_gb, self.obj_valid_gb)

    def test_from_text_valid_5v(self):
        ft_valid_5v = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: (none)",
                b"v: 5.000 V",
                b"i: 3.00 A"])
        self.assertEqual(ft_valid_5v, self.obj_valid_5v)

    def test_from_text_valid_1a(self):
        ft_valid_1a = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: (none)",
                b"v: 15.000 V",
                b"i: 1.00 A"])
        self.assertEqual(ft_valid_1a, self.obj_valid_1a)

    def test_from_text_valid_range(self):
        ft_valid_range = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: (none)",
                b"v: 15.000 V",
                b"vmin: 12.000 V",
                b"vmax: 16.000 V",
                b"i: 1.00 A"])
        self.assertEqual(ft_valid_range, self.obj_valid_range)

    def test_from_text_valid_hv(self):
        ft_valid_hv = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: HV_Preferred",
                b"v: 15.000 V",
                b"vmin: 12.000 V",
                b"vmax: 16.000 V",
                b"i: 1.00 A"])
        self.assertEqual(ft_valid_hv, self.obj_valid_hv)

    def test_from_text_invalid_index(self):
        with self.assertRaises(IndexError):
            pdbuddy.SinkConfig.from_text([b"Invalid index"])

    def test_from_text_no_configuration(self):
        ft_no_config = pdbuddy.SinkConfig.from_text([b"No configuration"])
        self.assertEqual(ft_no_config, self.obj_none)

    def test_from_text_valid_extra(self):
        ft_valid = pdbuddy.SinkConfig.from_text([b"status: valid",
                b"flags: (none)",
                b"This is an extra line, which shouldn't hurt anything.",
                b"v: 15.000 V",
                b"i: 3.00 A"])
        self.assertEqual(ft_valid, self.obj_valid)


class UnknownPDOTestCase(unittest.TestCase):

    def setUp(self):
        self.obj_zero = pdbuddy.UnknownPDO(value=0x00000000)
        self.obj_notzero = pdbuddy.UnknownPDO(value=0xFFFFFFFF)

    def test_str_zero(self):
        self.assertEqual(str(self.obj_zero), "00000000")

    def test_str_notzero(self):
        self.assertEqual(str(self.obj_notzero), "FFFFFFFF")


class SrcFixedPDOTestCase(unittest.TestCase):

    def setUp(self):
        self.obj_everything = pdbuddy.SrcFixedPDO(True, True, True, True, True,
                True, 3, 20000, 5000)
        self.obj_minimal = pdbuddy.SrcFixedPDO(False, False, False, False,
                False, False, 0, 5000, 1500)

    def test_str_everything(self):
        self.assertEqual(str(self.obj_everything),
                "fixed\n\tdual_role_pwr: 1\n\tusb_suspend: 1\n"
                "\tunconstrained_pwr: 1\n\tusb_comms: 1\n\tdual_role_data: 1\n"
                "\tunchunked_ext_msg: 1\n\tpeak_i: 3\n\tv: 20.00 V\n"
                "\ti: 5.00 A")

    def test_str_minimal(self):
        self.assertEqual(str(self.obj_minimal),
                "fixed\n\tv: 5.00 V\n\ti: 1.50 A")


class TypeCVirtualPDOTestCase(unittest.TestCase):

    def setUp(self):
        self.obj_1p5a = pdbuddy.TypeCVirtualPDO(1500)

    def test_str_1p5a(self):
        self.assertEqual(str(self.obj_1p5a), "typec_virtual\n\ti: 1.50 A")


class ReadPDOTestCase(unittest.TestCase):

    def setUp(self):
        self.src_fixed_everything = pdbuddy.SrcFixedPDO(True, True, True, True,
                True, True, 3, 20000, 5000)
        self.src_fixed_minimal = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 5000, 1500)
        self.unknown_zero = pdbuddy.UnknownPDO(value=0x00000000)
        self.unknown_notzero = pdbuddy.UnknownPDO(value=0xFFFFFFFF)
        self.typec_virtual = pdbuddy.TypeCVirtualPDO(1500)

    def test_read_src_fixed_everything(self):
        rp_src_fixed_everything = pdbuddy.read_pdo([b"PDO 1: fixed",
                b"\tdual_role_pwr: 1",
                b"\tusb_suspend: 1",
                b"\tunconstrained_pwr: 1",
                b"\tusb_comms: 1",
                b"\tdual_role_data: 1",
                b"\tunchunked_ext_msg: 1",
                b"\tpeak_i: 3",
                b"\tv: 20.00 V",
                b"\ti: 5.00 A"])
        self.assertEqual(self.src_fixed_everything, rp_src_fixed_everything)

    def test_read_src_fixed_minimal(self):
        rp_src_fixed_minimal = pdbuddy.read_pdo([b"PDO 1: fixed",
                b"\tv: 5.00 V",
                b"\ti: 1.50 A"])
        self.assertEqual(self.src_fixed_minimal, rp_src_fixed_minimal)

    def test_read_src_fixed_minimal_no_index(self):
        rp_src_fixed_minimal = pdbuddy.read_pdo([b"fixed",
                b"\tv: 5.00 V",
                b"\ti: 1.50 A"])
        self.assertEqual(self.src_fixed_minimal, rp_src_fixed_minimal)

    def test_read_unknown_zero(self):
        rp_unknown_zero = pdbuddy.read_pdo([b"PDO 1: 00000000"])
        self.assertEqual(self.unknown_zero, rp_unknown_zero)

    def test_read_unknown_notzero(self):
        rp_unknown_notzero = pdbuddy.read_pdo([b"PDO 1: FFFFFFFF"])
        self.assertEqual(self.unknown_notzero, rp_unknown_notzero)

    def test_read_typec_virtual(self):
        rp_typec_virtual = pdbuddy.read_pdo([b"PDO 5: typec_virtual",
                b"\ti: 1.50 A"])
        self.assertEqual(self.typec_virtual, rp_typec_virtual)

    def test_read_none(self):
        none_pdo = pdbuddy.read_pdo([b"No Source_Capabilities"])
        self.assertEqual(none_pdo, None)


class ReadPDOListTestCase(unittest.TestCase):

    def setUp(self):
        self.src_fixed_everything = pdbuddy.SrcFixedPDO(True, True, True, True,
                True, True, 3, 20000, 5000)
        self.src_fixed_minimal = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 5000, 1500)
        self.unknown_zero = pdbuddy.UnknownPDO(value=0x00000000)
        self.unknown_notzero = pdbuddy.UnknownPDO(value=0xFFFFFFFF)
        self.typec_virtual = pdbuddy.TypeCVirtualPDO(1500)

    def test_read_pdo_list(self):
        # It's not a legal list for USB Power Delivery, but it works fine for
        # testing this code
        text = [b"PDO 1: fixed",
                b"\tdual_role_pwr: 1",
                b"\tusb_suspend: 1",
                b"\tunconstrained_pwr: 1",
                b"\tusb_comms: 1",
                b"\tdual_role_data: 1",
                b"\tunchunked_ext_msg: 1",
                b"\tpeak_i: 3",
                b"\tv: 20.00 V",
                b"\ti: 5.00 A",
                b"PDO 2: fixed",
                b"\tv: 5.00 V",
                b"\ti: 1.50 A",
                b"PDO 3: 00000000",
                b"PDO 4: FFFFFFFF",
                b"PDO 5: typec_virtual",
                b"\ti: 1.50 A"]
        pdo_list = pdbuddy.read_pdo_list(text)

        self.assertEqual(pdo_list[0], self.src_fixed_everything)
        self.assertEqual(pdo_list[1], self.src_fixed_minimal)
        self.assertEqual(pdo_list[2], self.unknown_zero)
        self.assertEqual(pdo_list[3], self.unknown_notzero)
        self.assertEqual(pdo_list[4], self.typec_virtual)


class PDOListCalculationsTestCase(unittest.TestCase):

    def setUp(self):
        self.src_fixed_5v_1p5a = pdbuddy.SrcFixedPDO(False, False, True,
                False, False, False, 0, 5000, 1500)
        self.src_fixed_5v_3a = pdbuddy.SrcFixedPDO(False, False, True, False,
                False, False, 0, 5000, 3000)
        self.src_fixed_9v_1p6a = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 9000, 1600)
        self.src_fixed_9v_3a = pdbuddy.SrcFixedPDO(False, False, False, False,
                False, False, 0, 9000, 3000)
        self.src_fixed_10v_1p5a = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 10000, 1500)
        self.src_fixed_12v_5a = pdbuddy.SrcFixedPDO(False, False, False, False,
                False, False, 0, 12000, 5000)
        self.src_fixed_15v_1p8a = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 15000, 1800)
        self.src_fixed_15v_3a = pdbuddy.SrcFixedPDO(False, False, False, False,
                False, False, 0, 15000, 3000)
        self.src_fixed_20v_2p25a = pdbuddy.SrcFixedPDO(False, False, False,
                False, False, False, 0, 20000, 2250)
        self.src_fixed_20v_5a = pdbuddy.SrcFixedPDO(False, False, False, False,
                False, False, 0, 20000, 5000)
        self.typec_virtual_1p5a = pdbuddy.TypeCVirtualPDO(1500)

    def test_calculate_pdp_typec_virtual(self):
        self.assertEqual(pdbuddy.calculate_pdp([self.typec_virtual_1p5a]), 7.5)

    def test_calculate_pdp_15w(self):
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a]), 15)
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_1p6a]), 15)

    def test_calculate_pdp_27w(self):
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a]), 27)
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_1p8a]), 27)

    def test_calculate_pdp_45w(self):
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a]), 45)
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a,
                self.src_fixed_20v_2p25a]), 45)

    def test_calculate_pdp_100w(self):
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a,
                self.src_fixed_20v_5a]), 100)
        self.assertEqual(pdbuddy.calculate_pdp([self.src_fixed_5v_1p5a,
                self.src_fixed_12v_5a, self.src_fixed_20v_5a]), 100)

    def test_follows_power_rules_true(self):
        # <= 15 W
        self.assertTrue(pdbuddy.follows_power_rules([]))
        self.assertTrue(pdbuddy.follows_power_rules([self.typec_virtual_1p5a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_1p5a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_1p6a]))
        # <= 27 W
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_1p8a]))
        # <= 45 W
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a,
                self.src_fixed_20v_2p25a]))
        # <= 100 W
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a,
                self.src_fixed_20v_5a]))
        self.assertTrue(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_10v_1p5a,
                self.src_fixed_12v_5a, self.src_fixed_15v_3a,
                self.src_fixed_20v_5a]))

    def test_follows_power_rules_false(self):
        # <= 15 W
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_10v_1p5a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_1p5a,
            self.src_fixed_10v_1p5a]))
        # <= 27 W
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_9v_3a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_1p5a,
                self.src_fixed_9v_3a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_1p6a, self.src_fixed_15v_1p8a]))
        # <= 45 W
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_20v_2p25a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_1p5a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_1p6a, self.src_fixed_15v_3a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_1p8a,
                self.src_fixed_20v_2p25a]))
        # <= 100 W
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_20v_5a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_1p5a,
                self.src_fixed_9v_3a, self.src_fixed_15v_3a,
                self.src_fixed_20v_5a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_1p6a, self.src_fixed_15v_3a,
                self.src_fixed_20v_5a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_15v_1p8a,
                self.src_fixed_20v_5a]))
        self.assertFalse(pdbuddy.follows_power_rules([self.src_fixed_5v_3a,
                self.src_fixed_9v_3a, self.src_fixed_12v_5a,
                self.src_fixed_15v_3a, self.src_fixed_20v_2p25a]))