test cached_property

tests/integration/test_property.py

@@ -0,0 +1,46 @@
+import functools
+
+import zntrack.examples
+
+
+class NodeWithProperty(zntrack.Node):
+    params: int = zntrack.params(42)
+    outs: dict = zntrack.outs()
+
+    def run(self):
+        self.outs = {"outs": self.params}
+
+    @functools.cached_property
+    def value(self):
+        self.property_triggered = True
+        return self.outs
+
+
+def test_property_access_graph_building(proj_path):
+    project = zntrack.Project()
+
+    with project:
+        node = NodeWithProperty()
+        zntrack.examples.DepsToMetrics(deps=node.value)
+
+    project.build()
+
+    assert not hasattr(node, "property_triggered")
+
+    project.repro()
+
+    assert not hasattr(node, "property_triggered")
+
+    # assert node.outs != -5
+
+    with project:
+        node = NodeWithProperty()
+        zntrack.examples.DepsToMetrics(deps=node.value)
+
+    assert not hasattr(node, "property_triggered")
+    project.build()
+    assert not hasattr(node, "property_triggered")
+
+    # sanity check
+    node.value  # trigger property access
+    assert node.property_triggered is True