def test_empty():
cmd = SensirionI2cCommand(None, None, None, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
assert cmd.tx_data is None
assert cmd.rx_length is None
assert cmd.read_delay == 0.1
assert cmd.timeout == 0.2
def test_only_tx_data_4_bytes():
cmd = SensirionI2cCommand(None, b"\xDE\xAD\xBE\xEF", None, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
assert type(cmd.tx_data) is bytes
assert cmd.tx_data == b"\xDE\xAD\x98\xBE\xEF\x92"
assert cmd.rx_length is None
assert cmd.read_delay == 0.1
assert cmd.timeout == 0.2
def test_command_and_tx_data():
cmd = SensirionI2cCommand(0x1337, b"\xDE\xAD\xBE\xEF", 5, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
assert type(cmd.tx_data) is bytes
assert cmd.tx_data == b"\x13\x37\xDE\xAD\x98\xBE\xEF\x92"
assert cmd.rx_length is 5
assert cmd.read_delay == 0.1
assert cmd.timeout == 0.2
def test_only_command():
cmd = SensirionI2cCommand(0x1337, None, None, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
assert type(cmd.tx_data) is bytes
assert cmd.tx_data == b"\x13\x37"
assert cmd.rx_length is None
assert cmd.read_delay == 0.1
assert cmd.timeout == 0.2
def test_single_byte_command():
cmd = SensirionI2cCommand(0x42, b"\xDE\xAD\xBE\xEF", 5, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF), 1)
assert type(cmd.tx_data) is bytes
assert cmd.tx_data == b"\x42\xDE\xAD\x98\xBE\xEF\x92"
assert cmd.rx_length is 5
assert cmd.read_delay == 0.1
assert cmd.timeout == 0.2
def test_interpret_response_empty():
cmd = SensirionI2cCommand(None, None, 0, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
response = cmd.interpret_response(b"")
assert response is None
def test_post_processing_time_float():
cmd = SensirionI2cCommand(0x1337, b"\xDE\xAD\xBE\xEF", 5, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF), 2, 2.3)
assert type(cmd.post_processing_time) is float
assert cmd.post_processing_time == 2.3
def test_interpret_response_crc_error():
cmd = SensirionI2cCommand(None, None, 6, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
with pytest.raises(I2cChecksumError):
cmd.interpret_response(b"\xDE\xAD\x98\xBE\xEF\x93") # wrong crc
def test_interpret_response_6_bytes():
cmd = SensirionI2cCommand(None, None, 6, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
response = cmd.interpret_response(b"\xDE\xAD\x98\xBE\xEF\x92")
assert type(response) is bytes
assert response == b"\xDE\xAD\xBE\xEF"
def test_interpret_response_1_byte():
cmd = SensirionI2cCommand(None, None, 2, 0.1, 0.2,
CrcCalculator(8, 0x31, 0xFF))
response = cmd.interpret_response(b"\xDE")
assert type(response) is bytes
assert response == b"\xDE"