add tests for get_io and list_candidate_ios

Author: JuliaSprenger

neo/test/iotest/test_get_io.py

@@ -0,0 +1,33 @@
+from pathlib import Path
+from tempfile import TemporaryDirectory
+from neo.io import get_io, list_candidate_ios, NixIO
+
+
+def test_list_candidate_ios_non_existant_file():
+    # use plexon io suffix for testing here
+    non_existant_file = 'non_existant_folder/non_existant_file.plx'
+    ios = list_candidate_ios(non_existant_file)
+
+    assert ios
+
+
+def test_list_candidate_ios_filename_stub():
+    # create dummy folder with dummy files
+    with TemporaryDirectory(prefix='filename_stub_test_') as test_folder:
+        test_folder = Path(test_folder)
+        test_filename = (test_folder / 'dummy_file.nix')
+        test_filename.touch()
+        filename_stub = test_filename.with_suffix('')
+
+        # check that io is found even though file suffix was not provided
+        ios = list_candidate_ios(filename_stub)
+
+        assert NixIO in ios
+
+
+def test_get_io_non_existant_file_writable_io():
+    # use nixio for testing with writable io
+    non_existant_file = 'non_existant_file.nix'
+    io = get_io(non_existant_file)
+
+    assert isinstance(io, NixIO)