feat: added property callbacks, added warnings

tests/test_warnings.py

@@ -0,0 +1,34 @@
+from pytest import LogCaptureFixture
+
+from pyDataInterface import DataService
+
+from . import caplog  # noqa
+
+
+def test_setattr_warnings(caplog: LogCaptureFixture) -> None:  # noqa
+    # def test_setattr_warnings(capsys: CaptureFixture) -> None:
+    class SubClass:
+        name = "Hello"
+
+    class ServiceClass(DataService):
+        def __init__(self) -> None:
+            self.attr_1 = SubClass()
+            super().__init__()
+
+    ServiceClass()
+
+    assert "Warning: Class SubClass does not inherit from DataService." in caplog.text
+
+
+def test_private_attribute_warning(caplog: LogCaptureFixture) -> None:  # noqa
+    class ServiceClass(DataService):
+        def __init__(self) -> None:
+            self.__something = ""
+            super().__init__()
+
+    ServiceClass()
+
+    assert (
+        " Warning: You should not set private but rather protected attributes! Use "
+        "_something instead of __something." in caplog.text
+    )