adds validate_set decorator precision test

tests/observer_pattern/observable/test_decorators.py

@@ -0,0 +1,45 @@
+import pydase
+import pytest
+from pydase.observer_pattern.observable.decorators import validate_set
+
+
+def test_validate_set_precision(caplog: pytest.LogCaptureFixture) -> None:
+    class Service(pydase.DataService):
+        def __init__(self) -> None:
+            super().__init__()
+            self._value_1 = 0.0
+            self._value_2 = 0.0
+
+        @property
+        def value_1(self) -> float:
+            return self._value_1
+
+        @value_1.setter
+        @validate_set(precision=None)
+        def value_1(self, value: float) -> None:
+            self._value_1 = round(value, 1)
+
+        @property
+        def value_2(self) -> float:
+            return self._value_2
+
+        @value_2.setter
+        @validate_set(precision=1e-1)
+        def value_2(self, value: float) -> None:
+            self._value_2 = round(value, 1)
+
+    service_instance = Service()
+    pydase.Server(service_instance)  # needed to initialise observer
+
+    with pytest.raises(ValueError) as exc_info:
+        service_instance.value_1 = 1.12
+        assert "Failed to set value to 1.12 within 1 second. Current value: 1.1" in str(
+            exc_info
+        )
+
+    caplog.clear()
+
+    service_instance.value_2 = 1.12  # no assertion raised
+    assert service_instance.value_2 == 1.1  # noqa
+
+    assert "'value_2' changed to '1.1'" in caplog.text