def test_snapshot():
station = Station()
empty_snapshot = station.snapshot()
assert {
'instruments': {},
'parameters': {},
'components': {},
'config': None,
} == empty_snapshot
instrument = DummyInstrument('instrument', gates=['one'])
station.add_component(instrument)
instrument_snapshot = instrument.snapshot()
parameter = Parameter('parameter', label='Label', unit='m')
station.add_component(parameter)
parameter_snapshot = parameter.snapshot()
excluded_parameter = Parameter('excluded_parameter', snapshot_exclude=True)
station.add_component(excluded_parameter)
component = DumyPar('component')
component.metadata['smth'] = 'in the way she moves'
station.add_component(component)
component_snapshot = component.snapshot()
snapshot = station.snapshot()
assert isinstance(snapshot, dict)
assert [
'instruments',
'parameters',
'components',
'config',
] == list(snapshot.keys())
assert ['instrument'] == list(snapshot['instruments'].keys())
assert instrument_snapshot == snapshot['instruments']['instrument']
# the list should not contain the excluded parameter
assert ['parameter'] == list(snapshot['parameters'].keys())
assert parameter_snapshot == snapshot['parameters']['parameter']
assert ['component'] == list(snapshot['components'].keys())
assert component_snapshot == snapshot['components']['component']
def test_snapshot():
station = Station()
empty_snapshot = station.snapshot()
assert {'instruments': {},
'parameters': {},
'components': {},
'config': None,
'default_measurement': []
} == empty_snapshot
instrument = DummyInstrument('instrument', gates=['one'])
station.add_component(instrument)
instrument_snapshot = instrument.snapshot()
parameter = Parameter('parameter', label='Label', unit='m')
station.add_component(parameter)
parameter_snapshot = parameter.snapshot()
component = DumyPar('component')
component.metadata['smth'] = 'in the way she moves'
station.add_component(component)
component_snapshot = component.snapshot()
snapshot = station.snapshot()
assert isinstance(snapshot, dict)
assert ['instruments',
'parameters',
'components',
'config',
'default_measurement'
] == list(snapshot.keys())
assert ['instrument'] == list(snapshot['instruments'].keys())
assert instrument_snapshot == snapshot['instruments']['instrument']
assert ['parameter'] == list(snapshot['parameters'].keys())
assert parameter_snapshot == snapshot['parameters']['parameter']
assert ['component'] == list(snapshot['components'].keys())
assert component_snapshot == snapshot['components']['component']
assert [] == snapshot['default_measurement']
def test_station_after_instrument_is_closed():
"""
Test that station is aware of the fact that its components could be
removed within the lifetime of the station. Here we instantiate an
instrument, add it to a station, then close the instrument, and then
perform an action on the station to ensure that the closed instrument
does not break the work of the station object.
"""
bob = DummyInstrument('bob', gates=['one'])
station = Station(bob)
assert bob == station['bob']
bob.close()
# 'bob' is closed, but it is still part of the station
assert bob == station['bob']
# check that snapshot method executes without exceptions
snapshot = station.snapshot()
# check that 'bob's snapshot is not here (because 'bob' is closed,
# hence it was ignored, and even removed from the station by
# `snapshot_base` method)
assert {
'instruments': {},
'parameters': {},
'components': {},
'config': None,
'default_measurement': []
} == snapshot
# check that 'bob' has been removed from the station
with pytest.raises(KeyError, match='bob'):
_ = station.components['bob']
# check that 'bob' has been removed from the station, again
with pytest.raises(KeyError,
match='Component bob is not part of the '
'station'):
station.remove_component('bob')
def test_station_snapshot_during_measurement(experiment, dac, dmm,
pass_station):
station = Station()
station.add_component(dac)
station.add_component(dmm, 'renamed_dmm')
snapshot_of_station = station.snapshot()
if pass_station:
measurement = Measurement(experiment, station)
else:
# in this branch of the `if` we expect that `Measurement` object
# will be initialized with `Station.default` which is equal to the
# station object that is instantiated above
measurement = Measurement(experiment)
measurement.register_parameter(dac.ch1)
measurement.register_parameter(dmm.v1, setpoints=[dac.ch1])
with measurement.run() as data_saver:
data_saver.add_result((dac.ch1, 7), (dmm.v1, 5))
# 1. Test `get_metadata('snapshot')` method
json_snapshot_from_dataset = data_saver.dataset.get_metadata('snapshot')
snapshot_from_dataset = json.loads(json_snapshot_from_dataset)
expected_snapshot = {'station': snapshot_of_station}
assert expected_snapshot == snapshot_from_dataset
# 2. Test `snapshot_raw` property
assert json_snapshot_from_dataset == data_saver.dataset.snapshot_raw
# 3. Test `snapshot` property
assert expected_snapshot == data_saver.dataset.snapshot