Testing: Test import of future versions of files.

hyperspy/axes.py

@@ -318,7 +318,10 @@ def __init__(self,
             obj : The {} that the event belongs to.
             value : The new value
             """.format(_name, _name, _name), arguments=["obj", 'value'])
-
+        if name is None:
+            name = t.Undefined
+        if units is None:
+            units = t.Undefined
         self._suppress_value_changed_trigger = False
         self._suppress_update_value = False
         self.name = name

hyperspy/tests/io/test_hdf5.py

@@ -997,3 +997,18 @@ def test_more_recent_version_warning(tmp_path):
     with pytest.warns(UserWarning):
         s2 = load(filename)
     np.testing.assert_allclose(s.data, s2.data)
+
+
+def test_load_future():
+    """Code for creating future.hspy with hyperspy version 2.0.0
+
+    import hyperspy.api as hs
+    import numpy as np
+    s = hs.signals.Signal2D(np.ones((10,10,10,10)))
+    pos = np.array([[np.random.randint(0,10, (np.random.randint(1,10),2))  for i in range(10)]for j in range(10)], dtype=object)
+    p = hs.plot.markers.Points(offsets = pos)
+    s.add_marker(p, permanent=True)
+    s.save("future.hspy")
+    """
+    with pytest.warns(UserWarning):
+        future = load(filenames=my_path / "hdf5_files" / "future.hspy")

upcoming_changes/3241.bugfix.rst

@@ -0,0 +1,2 @@
+Allows for loading of ``.hspy`` files saved with version 2.0.0 and greater and no unit or name set
+for some axis.