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58 lines
1.6 KiB
Python
58 lines
1.6 KiB
Python
import sys
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import mock
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import pytest
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import bme680
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class MockSMBus:
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"""Mock a basic non-presence SMBus device to cause BME680 to fail.
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Returns 0 in all cases, so that CHIP_ID will never match.
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"""
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def __init__(self, bus): # noqa D107
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pass
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def read_byte_data(self, addr, register):
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"""Return 0 for all read attempts."""
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return 0
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class MockSMBusPresent:
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"""Mock enough of the BME680 for the library to initialise and test."""
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def __init__(self, bus):
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"""Initialise with test data."""
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self.regs = [0 for _ in range(256)]
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self.regs[bme680.CHIP_ID_ADDR] = bme680.CHIP_ID
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def read_byte_data(self, addr, register):
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"""Read a single byte from fake registers."""
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return self.regs[register]
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def write_byte_data(self, addr, register, value):
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"""Write a single byte to fake registers."""
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self.regs[register] = value
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def read_i2c_block_data(self, addr, register, length):
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"""Read up to length bytes from register."""
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return self.regs[register:register + length]
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def test_setup_not_present():
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"""Mock the adbsence of a BME680 and test initialisation."""
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sys.modules['smbus'] = mock.MagicMock()
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sys.modules['smbus'].SMBus = MockSMBus
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with pytest.raises(RuntimeError):
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sensor = bme680.BME680() # noqa F841
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def test_setup_mock_present():
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"""Mock the presence of a BME680 and test initialisation."""
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sys.modules['smbus'] = mock.MagicMock()
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sys.modules['smbus'].SMBus = MockSMBusPresent
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sensor = bme680.BME680() # noqa F841
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