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test_mock_signal_backend.py
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test_mock_signal_backend.py
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import asyncio
import re
from itertools import repeat
from unittest.mock import ANY, MagicMock, call
import pytest
from ophyd_async.core import MockSignalBackend, SignalRW
from ophyd_async.core.device import Device, DeviceCollector
from ophyd_async.core.mock_signal_utils import (
callback_on_mock_put,
get_mock_put,
mock_puts_blocked,
reset_mock_put_calls,
set_mock_put_proceeds,
set_mock_value,
set_mock_values,
)
from ophyd_async.core.signal import SignalW, soft_signal_r_and_setter, soft_signal_rw
from ophyd_async.core.soft_signal_backend import SoftSignalBackend
from ophyd_async.epics.signal.signal import epics_signal_r, epics_signal_rw
@pytest.mark.parametrize("connect_mock_mode", [True, False])
async def test_mock_signal_backend(connect_mock_mode):
mock_signal = SignalRW(MockSignalBackend(datatype=str))
# If mock is false it will be handled like a normal signal, otherwise it will
# initalize a new backend from the one in the line above
await mock_signal.connect(mock=connect_mock_mode)
assert isinstance(mock_signal._backend, MockSignalBackend)
assert await mock_signal._backend.get_value() == ""
await mock_signal._backend.put("test")
assert await mock_signal._backend.get_value() == "test"
assert mock_signal._backend.put_mock.call_args_list == [
call("test", wait=True, timeout=None),
]
@pytest.mark.parametrize("epics_protocol", ["ca", "pva"])
async def test_mock_signal_backend_source(epics_protocol):
mock_signal_rw = epics_signal_rw(
str,
f"{epics_protocol}://READ_PV",
f"{epics_protocol}://WRITE_PV",
name="mock_name",
)
mock_signal_r = epics_signal_r(
str,
f"{epics_protocol}://READ_PV",
name="mock_name",
)
await mock_signal_rw.connect(mock=True)
await mock_signal_r.connect(mock=True)
assert mock_signal_rw.source == f"mock+{epics_protocol}://READ_PV"
assert mock_signal_r.source == f"mock+{epics_protocol}://READ_PV"
async def test_set_mock_value():
mock_signal = SignalRW(SoftSignalBackend(int))
await mock_signal.connect(mock=True)
assert await mock_signal.get_value() == 0
assert await mock_signal._backend.get_value() == 0
set_mock_value(mock_signal, 10)
assert await mock_signal.get_value() == 10
assert await mock_signal._backend.get_value() == 10
async def test_set_mock_put_proceeds():
mock_signal = SignalW(SoftSignalBackend(str))
await mock_signal.connect(mock=True)
assert isinstance(mock_signal._backend, MockSignalBackend)
assert mock_signal._backend.put_proceeds.is_set() is True
set_mock_put_proceeds(mock_signal, False)
assert mock_signal._backend.put_proceeds.is_set() is False
set_mock_put_proceeds(mock_signal, True)
assert mock_signal._backend.put_proceeds.is_set() is True
async def test_set_mock_put_proceeds_timeout():
mock_signal = SignalRW(SoftSignalBackend(str))
await mock_signal.connect(mock=True)
set_mock_put_proceeds(mock_signal, False)
with pytest.raises(asyncio.exceptions.TimeoutError):
await mock_signal.set("test", wait=True, timeout=1)
async def test_put_proceeds_timeout():
mock_signal = SignalW(SoftSignalBackend(str))
await mock_signal.connect(mock=True)
assert isinstance(mock_signal._backend, MockSignalBackend)
assert mock_signal._backend.put_proceeds.is_set() is True
set_mock_put_proceeds(mock_signal, False)
assert mock_signal._backend.put_proceeds.is_set() is False
set_mock_put_proceeds(mock_signal, True)
assert mock_signal._backend.put_proceeds.is_set() is True
async def test_mock_utils_throw_error_if_backend_isnt_mock_signal_backend():
signal = SignalRW(SoftSignalBackend(int))
exc_msgs = []
with pytest.raises(AssertionError) as exc:
set_mock_value(signal, 10)
exc_msgs.append(str(exc.value))
with pytest.raises(AssertionError) as exc:
get_mock_put(signal).assert_called_once_with(10)
exc_msgs.append(str(exc.value))
with pytest.raises(AssertionError) as exc:
async with mock_puts_blocked(signal):
...
exc_msgs.append(str(exc.value))
with pytest.raises(AssertionError) as exc:
with callback_on_mock_put(signal, lambda x: _):
...
exc_msgs.append(str(exc.value))
with pytest.raises(AssertionError) as exc:
set_mock_put_proceeds(signal, False)
exc_msgs.append(str(exc.value))
with pytest.raises(AssertionError) as exc:
for _ in set_mock_values(signal, [10]):
...
exc_msgs.append(str(exc.value))
for msg in exc_msgs:
assert msg == (
"Expected to receive a `MockSignalBackend`, instead "
f" received {SoftSignalBackend}. "
)
async def test_get_mock_put():
mock_signal = epics_signal_rw(str, "READ_PV", "WRITE_PV", name="mock_name")
await mock_signal.connect(mock=True)
await mock_signal.set("test_value", wait=True, timeout=100)
mock = get_mock_put(mock_signal)
mock.assert_called_once_with("test_value", wait=True, timeout=100)
def err_text(text, wait, timeout):
return (
f"Expected: put('{re.escape(str(text))}', wait={re.escape(str(wait))},"
f" timeout={re.escape(str(timeout))})",
"Actual: put('test_value', wait=True, timeout=100)",
)
for text, wait, timeout in [
("wrong_name", True, 100), # name wrong
("test_value", False, 100), # wait wrong
("test_value", True, 0), # timeout wrong
("test_value", False, 0), # wait and timeout wrong
]:
with pytest.raises(AssertionError) as exc:
mock.assert_called_once_with(text, wait=wait, timeout=timeout)
for err_substr in err_text(text, wait, timeout):
assert err_substr in str(exc.value)
@pytest.fixture
async def mock_signals():
async with DeviceCollector(mock=True):
signal1 = epics_signal_rw(str, "READ_PV1", "WRITE_PV1", name="mock_name1")
signal2 = epics_signal_rw(str, "READ_PV2", "WRITE_PV2", name="mock_name2")
await signal1.set("first_value", wait=True, timeout=1)
await signal2.set("first_value", wait=True, timeout=1)
assert await signal1.get_value() == "first_value"
assert await signal2.get_value() == "first_value"
return signal1, signal2
async def test_blocks_during_put(mock_signals):
signal1, signal2 = mock_signals
async with mock_puts_blocked(signal1, signal2):
status1 = signal1.set("second_value", wait=True, timeout=1)
status2 = signal2.set("second_value", wait=True, timeout=1)
assert await signal1.get_value() == "second_value"
assert await signal2.get_value() == "second_value"
assert not status1.done
assert not status2.done
await asyncio.sleep(1e-4)
assert status1.done
assert status2.done
assert await signal1._backend.get_value() == "second_value"
assert await signal2._backend.get_value() == "second_value"
async def test_callback_on_mock_put_ctxt(mock_signals):
signal1_callbacks = MagicMock()
signal2_callbacks = MagicMock()
signal1, signal2 = mock_signals
with callback_on_mock_put(signal1, signal1_callbacks):
await signal1.set("second_value", wait=True, timeout=1)
with callback_on_mock_put(signal2, signal2_callbacks):
await signal2.set("second_value", wait=True, timeout=1)
signal1_callbacks.assert_called_once_with("second_value", wait=True, timeout=1)
signal2_callbacks.assert_called_once_with("second_value", wait=True, timeout=1)
async def test_callback_on_mock_put_no_ctx():
mock_signal = SignalRW(SoftSignalBackend(float))
await mock_signal.connect(mock=True)
calls = []
callback_on_mock_put(
mock_signal, lambda *args, **kwargs: calls.append({**kwargs, "_args": args})
)
await mock_signal.set(10.0)
assert calls == [
{
"_args": (10.0,),
"timeout": 10.0,
"wait": True,
}
]
async def test_callback_on_mock_put_fails_if_args_are_not_correct():
mock_signal = SignalRW(SoftSignalBackend(float))
await mock_signal.connect(mock=True)
def some_function_without_kwargs(arg):
pass
callback_on_mock_put(mock_signal, some_function_without_kwargs)
with pytest.raises(TypeError) as exc:
await mock_signal.set(10.0)
assert str(exc.value).endswith(
"some_function_without_kwargs() got an unexpected keyword argument 'wait'"
)
async def test_set_mock_values(mock_signals):
signal1, signal2 = mock_signals
assert await signal2.get_value() == "first_value"
for value_set in set_mock_values(signal1, ["second_value", "third_value"]):
assert await signal1.get_value() == value_set
iterator = set_mock_values(signal2, ["second_value", "third_value"])
assert await signal2.get_value() == "first_value"
next(iterator)
assert await signal2.get_value() == "second_value"
next(iterator)
assert await signal2.get_value() == "third_value"
async def test_set_mock_values_exhausted_passes(mock_signals):
signal1, signal2 = mock_signals
for value_set in set_mock_values(
signal1, ["second_value", "third_value"], require_all_consumed=True
):
assert await signal1.get_value() == value_set
iterator = set_mock_values(
signal2,
repeat(iter(["second_value", "third_value"]), 6),
require_all_consumed=False,
)
for calls, value_set in enumerate(iterator, start=1):
assert await signal2.get_value() == value_set
assert calls == 6
async def test_set_mock_values_exhausted_fails(mock_signals):
signal1, signal2 = mock_signals
for value_set in (
iterator := set_mock_values(
signal1, ["second_value", "third_value"], require_all_consumed=True
)
):
assert await signal1.get_value() == value_set
break
with pytest.raises(AssertionError):
iterator.__del__()
# Set so it doesn't raise the same error on teardown
iterator.require_all_consumed = False
async def test_reset_mock_put_calls(mock_signals):
signal1, signal2 = mock_signals
await signal1.set("test_value", wait=True, timeout=1)
get_mock_put(signal1).assert_called_with("test_value", wait=ANY, timeout=ANY)
reset_mock_put_calls(signal1)
with pytest.raises(AssertionError) as exc:
get_mock_put(signal1).assert_called_with("test_value", wait=ANY, timeout=ANY)
# Replacing spaces because they change between runners
# (e.g the github actions runner has more)
assert str(exc.value).replace(" ", "").replace("\n", "") == (
"expectedcallnotfound."
"Expected:put('test_value',wait=<ANY>,timeout=<ANY>)"
"Actual:notcalled."
)
async def test_mock_signal_of_soft_signal_backend_receives_intial_value():
class SomeDevice(Device):
def __init__(self, name):
self.my_signal = soft_signal_rw(
datatype=int,
initial_value=10,
name=name,
)
mocked_device = SomeDevice("mocked_device")
await mocked_device.connect(mock=True)
soft_device = SomeDevice("soft_device")
await soft_device.connect(mock=False)
assert await mocked_device.my_signal.get_value() == 10
assert await soft_device.my_signal.get_value() == 10
async def test_writing_to_soft_signals_in_mock():
class MyDevice(Device):
def __init__(self, prefix: str, name: str = ""):
self.signal, self.backend_put = soft_signal_r_and_setter(int)
async def set(self):
self.backend_put(1)
device = MyDevice("-SOME-PREFIX", name="my_device")
await device.connect(mock=True)
assert await device.signal.get_value() == 0
await device.set()
assert await device.signal.get_value() == 1
signal, backend_put = soft_signal_r_and_setter(int)
await signal.connect(mock=False)
assert await signal.get_value() == 0
backend_put(100)
assert await signal.get_value() == 100
async def test_when_put_mock_called_with_typo_then_fails_but_calling_directly_passes():
mock_signal = SignalRW(SoftSignalBackend(int))
await mock_signal.connect(mock=True)
assert isinstance(mock_signal._backend, MockSignalBackend)
mock = mock_signal._backend.put_mock
with pytest.raises(AttributeError):
mock.asssert_called_once() # Note typo here is deliberate!
mock()