def test_query_close_once_at_init(caplog):
"""
Test that, during initialisation, we query the closed channels only once
"""
with caplog.at_level(logging.DEBUG):
S46('s46_test_query_once', address='GPIB::2::INSTR', visalib=visalib)
assert caplog.text.count(":CLOS?") == 1
def s46_four():
"""
A four channel-per-relay instrument
"""
driver = S46('s46_four', address='GPIB::3::INSTR', visalib=visalib)
yield driver
driver.close()
def s46_six():
"""
A six channel-per-relay instrument
"""
driver = S46('s46_six', address='GPIB::2::INSTR', visalib=visalib)
yield driver
driver.close()
def test_runtime_error_on_bad_init():
"""
If we initialize the driver from an instrument state with more then one
channel per relay closed, raise a runtime error. An instrument can come to
this state if previously, other software was used to control the instrument
"""
with pytest.raises(
RuntimeError,
match="The driver is initialized from an undesirable instrument state"
):
S46('s46_bad_state', address='GPIB::1::INSTR', visalib=visalib)