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+## Problem Description
+
+7 tests in `tests/test_file_upload.py` are failing in the CI pipeline due to Celery task mocking issues. The tests expect the `delay` method to be called once, but it's being called 0 times.
+
+### Failing Tests
+- `test_upload_valid_text_file`
+- `test_upload_valid_image_jpeg`
+- `test_upload_valid_png_image`
+- `test_upload_office_document_docx`
+- `test_upload_csv_file`
+- `test_upload_executable_file`
+- `test_image_by_extension`
+
+### Error Message
+```
+AssertionError: Expected 'delay' to have been called once. Called 0 times.
+```
+
+### Root Cause Analysis
+
+The test fixture `mock_celery_tasks` is patching the Celery tasks at:
+- `app.api.files.process_document.delay`
+- `app.api.files.convert_to_pdf.delay`
+
+However, looking at the actual implementation in `app/api/files.py` (lines 656, 662, 669, 674), the tasks are invoked using `.delay()` method correctly:
+- Line 656: `task = process_document.delay(target_path, original_filename=safe_filename)`
+- Line 662: `task = convert_to_pdf.delay(target_path, original_filename=safe_filename)`
+- Line 669: `task = convert_to_pdf.delay(target_path, original_filename=safe_filename)`
+- Line 674: `task = convert_to_pdf.delay(target_path, original_filename=safe_filename)`
+
+The issue is that the patches are applied correctly but the mocks are not being invoked. This suggests:
+1. The patch path might need adjustment
+2. The tasks might be imported/accessed differently at runtime
+3. There might be an issue with how the tasks are being called in the test environment
+
+### Files to Fix
+- `tests/test_file_upload.py` - Fix the mock patching in the `mock_celery_tasks` fixture (lines 20-36)
+
+### Expected Behavior
+All tests should pass with 100% success rate. The mocked Celery tasks should be called appropriately when files are uploaded through the `/api/ui-upload` endpoint.
+
+### Solution Approach
+1. Verify the correct patch path for the Celery tasks
+2. Ensure the patch is applied before the import of the tasks
+3. Consider patching at the module level where tasks are defined rather than where they're used
+4. Alternative: Patch the task objects directly: `app.tasks.process_document.process_document` and `app.tasks.convert_to_pdf.convert_to_pdf`
+
+### Reference
+- Failing job: https://github.com/christianlouis/DocuElevate/actions/runs/21801196852/job/62896908441
+- Commit: 17795620c62c0bcf744eb7e940a3262c364f9bed
+
+### Acceptance Criteria
+- All 7 failing tests pass
+- Total test suite passes with 180/180 tests passing (currently 173/180)
+- CI pipeline succeeds
+- No regression in other tests
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