Fix skeleton doc example (#884)

* copy/paste doc examplee to tests

* doc: Fix broken example

---------

Co-authored-by: Norman Rzepka <[email protected]>

Author: erjel

webknossos/tests/test_skeleton.py

@@ -51,6 +51,20 @@ def create_dummy_skeleton() -> wk.Skeleton:
     return nml
 
 
+def test_doc_example() -> None:
+    from webknossos import Annotation
+
+    annotation = Annotation(
+        name="my_annotation", dataset_name="my_dataset", voxel_size=(11, 11, 24)
+    )
+    group = annotation.skeleton.add_group("a group")
+    tree = group.add_tree("a tree")
+    node_1 = tree.add_node(position=(0, 0, 0), comment="node 1")
+    node_2 = tree.add_node(position=(100, 100, 100), comment="node 2")
+
+    tree.add_edge(node_1, node_2)
+
+
 def test_immutability() -> None:
     skeleton = create_dummy_skeleton()
 

webknossos/webknossos/skeleton/skeleton.py

@@ -23,7 +23,9 @@ class Skeleton(Group):
     A small usage example:
 
     ```python
-    annotation = Annotation("my_annotation", voxel_size=(11, 11, 24))
+    annotation = Annotation(
+        name="my_annotation", dataset_name="my_dataset", voxel_size=(11, 11, 24)
+    )
     group = annotation.skeleton.add_group("a group")
     tree = group.add_tree("a tree")
     node_1 = tree.add_node(position=(0, 0, 0), comment="node 1")