Adjust based on pre-commit

tests/README.md

@@ -11,22 +11,27 @@ pytest <args>
 ```
 
 ## Regenerating the test data
-For testing there were some files generated at some point in the past. These files shouldn't be changed. However, 
-there are cases when they might need to be recreated. E.g. an `anndata` update could lead to warnings when loading h5ads 
+
+For testing there were some files generated at some point in the past. These files shouldn't be changed. However,
+there are cases when they might need to be recreated. E.g. an `anndata` update could lead to warnings when loading h5ads
 saved with older versions of `anndata` or similar things. In this case, the test data can be regenerated by running:
 
 1. For test data etc.:
-Run the functions of the file `tests/_generate_test_files.py`. (not implemented yet)
+   Run the functions of the file `tests/_generate_test_files.py`. (not implemented yet)
 
 2. For tests that compare their outputs to previously generated outputs (mainly plots):
-- Run the according tests
-- Find out the temp directory of pytest: e.g. from `python`:
+
+-   Run the according tests
+-   Find out the temp directory of pytest: e.g. from `python`:
+
 ```python
 import tempfile
 tempfile.gettempdir()
 ```
+
 The newest outputs should be in a folder like `<tempdir>/pytest-of-<user>/pytest-<pid>/test_<testname>/`
-- Copy the new outputs to the according test subfolder `tests/...` and overwrite the old ones.
 
-3. Some tests don't save their outputs to files but compare them directly to some reference values. In this case, there 
-should be a comment in the test code that explains how to regenerate the reference values. E.g. function `test_knns_shared_comp` in `spapros/tests/evaluation/test_metrics.py`.
+-   Copy the new outputs to the according test subfolder `tests/...` and overwrite the old ones.
+
+3. Some tests don't save their outputs to files but compare them directly to some reference values. In this case, there
+   should be a comment in the test code that explains how to regenerate the reference values. E.g. function `test_knns_shared_comp` in `spapros/tests/evaluation/test_metrics.py`.

tests/plotting/test_plotting.py

@@ -8,22 +8,24 @@
 # Note: The figures depend somehow on the environment!
 # Tests might fail if compared figures derived from different envs eg development env and test env
 
+
 def _transform_string(s):
     """Transforms a string by replacing ': ' with '-' and ', ' with '_',
     and then removing problematic characters for Windows filenames.
-    
-    In the tests we use the kwargs of the functions as strings to name output files. To get a valid name for windows 
+
+    In the tests we use the kwargs of the functions as strings to name output files. To get a valid name for windows
     we need to replace certain characters.
     """
     # Initial replacements
-    transformed = s.replace(': ', '-').replace(', ', '_')
-    
+    transformed = s.replace(": ", "-").replace(", ", "_")
+
     # Additional removals
-    for char in [':', ',', '{', '}', "'", '[', ']']:
-        transformed = transformed.replace(char, '')
-    
+    for char in [":", ",", "{", "}", "'", "[", "]"]:
+        transformed = transformed.replace(char, "")
+
     return transformed
 
+
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 # selection #
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