[NixFr] Add test to read and compare from different neo versions

Author: JuliaSprenger

neo/test/iotest/test_nixio.py

@@ -30,6 +30,7 @@
                       IrregularlySampledSignal, SpikeTrain,
                       Event, Epoch, ImageSequence, Group, ChannelView)
 from neo.test.iotest.common_io_test import BaseTestIO
+from neo.test.tools import assert_same_sub_schema
 from neo.io.nixio import (NixIO, create_quantity, units_to_string, neover,
                           dt_from_nix, dt_to_nix, DATETIMEANNOTATION)
 from neo.io.nixio_fr import NixIO as NixIO_lazy
@@ -1797,6 +1798,37 @@ def test_file_with_ver(self):
             self.assertEqual(iofile._file_version, neover)
 
 
+@unittest.skipUnless(HAVE_NIX, "Requires NIX")
+class CompareTestFileVersions(BaseTestIO, unittest.TestCase):
+
+    ioclass = NixIO_lazy
+    entities_to_download = ['nix']
+    entities_to_test = []
+
+    @classmethod
+    def setUpClass(cls):
+        super(CompareTestFileVersions, cls).setUpClass()
+        
+        cls.neo_versions = ['0.6.1', '0.7.2', '0.8.0', '0.9.0', '0.10.2', '0.11.1', '0.12.0']
+        cls.blocks = []
+
+        for filename in [f'nix/generated_file_neo{ver}.nix' for ver in cls.neo_versions]:
+            filename = BaseTestIO.get_local_path(filename)
+            # filename = '/home/sprengerj/repos/ephy_testing_data/' + filename
+            print(f'Loading {filename}')
+
+            io = NixIO_lazy(filename, autogenerate_stream_names=False, autogenerate_unit_ids=False)
+            block = io.read_block(lazy=False)
+            cls.blocks.append(block)
+
+    def test_compare_file_versions(self):
+        # assert all versions result in comparable neo structures (ideally identical)
+        reference_block = self.blocks[0]
+        for bl in self.blocks[1:]:
+            assert_same_sub_schema(reference_block, bl, exclude=['file_origin', 'magnitude'])
+
+
+
 @unittest.skipUnless(HAVE_NIX, "Requires NIX")
 class CommonTests(BaseTestIO, unittest.TestCase):
     ioclass = NixIO