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"""Test event helpers."""
from zwave_js_server import event
def test_once():
"""Test once listens to event once."""
mock = event.EventBase()
calls = []
mock.once("test-event", calls.append)
mock.emit("test-event", 1)
mock.emit("test-event", 2)
assert len(calls) == 1
def test_exception_on_emit(caplog):
"""Test exception on emit gets handled."""
mock = event.EventBase()
mock.on("test-event", lambda _: 1 / 0)
mock.emit("test-event", 1)
assert "Error handling event: test-event" in caplog.text
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