Resolve "Failing unit tests on Windows"

Summary

Related to #182 (closed): Fixes basically only Windows paths ("" instead of "/" on Windows) and files being opened twice (which Windows does not allow).

Focus

Point the reviewer to the core of the code change. Where should they start reading? What should they focus on (e.g. security, performance, maintainability, user-friendliness, compliance with the specs, finding more corner cases, concrete questions)?

Test Environment

How to set up a test environment for manual testing?

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

Related to #182 (closed)

unittests/test_cfood_metadata.py

@@ -18,7 +18,7 @@
 # along with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 from tempfile import NamedTemporaryFile
-from unittest.mock import MagicMock, Mock, patch
+from unittest.mock import patch
 
 import pytest
 import yaml
@@ -33,7 +33,7 @@ def _temp_file_load(txt: str):
     definition using load_definition from Crawler.
     """
     definition = None
-    with NamedTemporaryFile() as f:
+    with NamedTemporaryFile(delete=False) as f:
         f.write(txt.encode())
         f.flush()
         definition = load_definition(f.name)