Tests: ingester's log excerpt functions

[MarceloRobert]

Changes

• Adds unit tests for the log_excerpt functions used in the ingester, being:
  upload_logexcerpt
  get_from_cache
  set_in_cache
  set_log_excerpt_ofile
  process_log_excerpt_from_item
  extract_log_excerpt
  cache_logs_maintenance

How to test

Run the unit tests of the file and check that they are all passing.
Also check if the test cases cover the function well

Part of #1569

[Copilot]

Pull Request Overview

This PR adds comprehensive unit test coverage for the log excerpt utility functions along with supporting test fixture data. The changes introduce tests for log excerpt upload, caching, processing, and extraction functionality.

• Adds test fixture data file containing mock constants for log excerpt testing
• Implements comprehensive test coverage for all functions in log_excerpt_utils.py including upload, caching, processing, and maintenance operations
• Organizes tests into logical test classes covering successful paths, error cases, and edge conditions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
backend/kernelCI_app/tests/unitTests/helpers/fixtures/log_excerpt_data.py	Introduces mock constants and test data for log excerpt testing
backend/kernelCI_app/tests/unitTests/commands/monitorSubmissions/log_excerpt_utils_test.py	Adds comprehensive unit tests for all log excerpt utility functions

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[gustavobtflores]

nit: as we are always using one class per function, i would move this to another class

[gustavobtflores]

for this test and the ones below refered to cache utils, i think it would be better to add the key on the cache and then try to get after to see if the function returns the value correctly

Something like:

mock_cache.set(key, value)
result = mock_cache.get(key)

assert result == value

with the current implementation, if we have:

def get_from_cache(log_hash: str) -> Optional[str]:
    """
    Check if log_hash is in the cache

    Returns:
        str|None: The log_excerpt if it exists in cache, None otherwise
    """
    with cache_logs_lock:
        return CACHE_LOGS.get("somehash")

the tests would still pass, but the logic for the cache function itself is incorrect

[MarceloRobert]

In this case I believe I should edit the test for a success get from cache. What do you think?

[MarceloRobert]

I updated both get and set cache tests

[gustavobtflores]

mock_cache_logs seems to be unused, assert or remove it maybe?

[MarceloRobert]

wasn't needed, removed

[gustavobtflores]

LGTM