add tests

tests/compas/datastructures/test_hashtree.py

@@ -0,0 +1,26 @@
+from compas.datastructures import HashTree
+from compas.datastructures import Mesh
+
+
+def test_hashtree_from_dict():
+
+    tree1 = HashTree.from_dict({"a": {"b": 1, "c": 3}, "d": [1, 2, 3], "e": 2})
+    tree2 = HashTree.from_dict({"a": {"b": 1, "c": 2}, "d": [1, 2, 3], "f": 2})
+    diff = tree2.diff(tree1)
+
+    assert diff["added"] == [{"path": ".f", "value": 2}]
+    assert diff["removed"] == [{"path": ".e", "value": 2}]
+    assert diff["modified"] == [{"path": ".a.c", "old": 3, "new": 2}]
+
+
+def test_hashtree_from_mesh():
+    mesh = Mesh.from_polyhedron(4)
+    tree1 = HashTree.from_dict(mesh.__data__)
+    mesh.vertex_attribute(0, "x", 1.0)
+    mesh.delete_face(3)
+    tree2 = HashTree.from_dict(mesh.__data__)
+    diff = tree2.diff(tree1)
+
+    assert diff["added"] == []
+    assert diff["removed"] == [{"path": ".face.3", "value": [1, 3, 2]}, {"path": ".facedata.3", "value": None}]
+    assert diff["modified"] == [{"path": ".vertex.0.x", "old": -0.8164965809277261, "new": 1.0}]