Add signal connection to tests/6-expose-python-to-godot/

Author: touilleMan

tests/6-expose-python-to-godot/expected.output

@@ -1,9 +1,11 @@
 Godot Engine .* - https://godotengine.org
 
 Godot-Python .* \(CPython .*\)
+MyPythonNode: _on_tree_entered
 MyPythonNode: _ready
 MyPythonNode: hello\(42\)
 MyPythonNode: hello_static_method\(GDString\('World'\)\)
 MyPythonNode: hello_class_method\(GDArray\(\[42, "World"\]\), MyPythonNode\(foo=1, _read_write_prop=Vector2\(x=0.0, y=0.0\)\)\)
 GDScript: simple_signal received
 GDScript: data_signal received with count=99, message=test message
+MyPythonNode: _on_tree_exiting

tests/6-expose-python-to-godot/main.tscn

@@ -8,3 +8,5 @@
 
 [node name="Node" type="Node" parent="."]
 script = ExtResource("1_ig7tw")
+
+[connection signal="tree_entered" from="MyPythonNode" to="MyPythonNode" method="_on_tree_entered"]

tests/6-expose-python-to-godot/node.py

@@ -2,7 +2,7 @@
 from dataclasses import field
 from typing import ClassVar
 
-from godot import GDAny, GDArray, GDString, Vector2, signal, classes, gddataclass
+from godot import GDAny, GDArray, GDString, Vector2, signal, classes, gddataclass, GDCallable
 
 
 @gddataclass(init=False)
@@ -38,6 +38,13 @@ def read_write_prop(self, val: Vector2) -> None:
 
     def _ready(self):
         print("MyPythonNode: _ready", flush=True)
+        self.tree_exiting.connect(GDCallable.create(self, "_on_tree_exiting"))
+
+    def _on_tree_entered(self):
+        print("MyPythonNode: _on_tree_entered", flush=True)
+
+    def _on_tree_exiting(self):
+        print("MyPythonNode: _on_tree_exiting", flush=True)
 
     def hello(self, a: int) -> GDString:
         print(f"MyPythonNode: hello({a!r})", flush=True)