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2025-12-04 14:53:55 +01:00

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Testing & Migration Guide

Overview

This guide covers:

  1. Migrating existing cache to compressed format
  2. Running the test suite
  3. Understanding test results

Step 1: Migrate Cache to Compressed Format

If you have an existing database with uncompressed entries (from before compression was added), run the migration script:

python migrate_compress_cache.py

What it does:

  • Finds all cache entries where data is uncompressed
  • Compresses them using zlib (level 9)
  • Reports compression statistics and space saved
  • Verifies all entries are compressed

Expected output:

Cache Compression Migration Tool
============================================================
Initial database size: 1024.56 MB

Found 1134 uncompressed cache entries
Starting compression...
  Compressed 100/1134 entries... (78.3% reduction so far)
  Compressed 200/1134 entries... (79.1% reduction so far)
  ...

============================================================
MIGRATION COMPLETE
============================================================
Entries compressed: 1134
Original size:      1024.56 MB
Compressed size:    198.34 MB
Space saved:        826.22 MB
Compression ratio:  80.6%
============================================================

VERIFICATION:
  Compressed entries:   1134
  Uncompressed entries: 0
  ✓ All cache entries are compressed!

Final database size: 1024.56 MB
Database size reduced by: 0.00 MB

✓ Migration complete! You can now run VACUUM to reclaim disk space:
  sqlite3 /mnt/okcomputer/output/cache.db 'VACUUM;'

Reclaim disk space:

After migration, the database file still contains the space used by old uncompressed data. To actually reclaim the disk space:

sqlite3 /mnt/okcomputer/output/cache.db 'VACUUM;'

This will rebuild the database file and reduce its size significantly.

Step 2: Run Tests

The test suite validates that auction and lot parsing works correctly using cached data only (no live requests to server).

python test_scraper.py

What it tests:

Auction Pages:

  • Type detection (must be 'auction')
  • auction_id extraction
  • title extraction
  • location extraction
  • lots_count extraction
  • first_lot_closing_time extraction

Lot Pages:

  • Type detection (must be 'lot')
  • lot_id extraction
  • title extraction (must not be '...', 'N/A', or empty)
  • location extraction (must not be 'Locatie', 'Location', or empty)
  • current_bid extraction (must not be '€Huidig ​​bod' or invalid)
  • closing_time extraction
  • images array extraction
  • bid_count validation
  • viewing_time and pickup_date (optional)

Expected output:

======================================================================
TROOSTWIJK SCRAPER TEST SUITE
======================================================================

This test suite uses CACHED data only - no live requests to server
======================================================================

======================================================================
CACHE STATUS CHECK
======================================================================
Total cache entries: 1134
Compressed: 1134 (100.0%)
Uncompressed: 0 (0.0%)

✓ All cache entries are compressed!

======================================================================
TEST URL CACHE STATUS:
======================================================================
✓ https://www.troostwijkauctions.com/a/online-auction-cnc-lat...
✓ https://www.troostwijkauctions.com/a/faillissement-bab-sho...
✓ https://www.troostwijkauctions.com/a/industriele-goederen-...
✓ https://www.troostwijkauctions.com/l/%25282x%2529-duo-bure...
✓ https://www.troostwijkauctions.com/l/tos-sui-50-1000-unive...
✓ https://www.troostwijkauctions.com/l/rolcontainer-%25282x%...

6/6 test URLs are cached

======================================================================
TESTING AUCTIONS
======================================================================

======================================================================
Testing Auction: https://www.troostwijkauctions.com/a/online-auction...
======================================================================
✓ Cache hit (age: 12.3 hours)
  ✓ auction_id: A7-39813
  ✓ title: Online Auction: CNC Lathes, Machining Centres & Precision...
  ✓ location: Cluj-Napoca, RO
  ✓ first_lot_closing_time: 2024-12-05 14:30:00
  ✓ lots_count: 45

======================================================================
TESTING LOTS
======================================================================

======================================================================
Testing Lot: https://www.troostwijkauctions.com/l/%25282x%2529-duo...
======================================================================
✓ Cache hit (age: 8.7 hours)
  ✓ lot_id: A1-28505-5
  ✓ title: (2x) Duo Bureau - 160x168 cm
  ✓ location: Dongen, NL
  ✓ current_bid: No bids
  ✓ closing_time: 2024-12-10 16:00:00
  ✓ images: 2 images
      1. https://media.tbauctions.com/image-media/c3f9825f-e3fd...
      2. https://media.tbauctions.com/image-media/45c85ced-9c63...
  ✓ bid_count: 0
  ✓ viewing_time: 2024-12-08 09:00:00 - 2024-12-08 17:00:00
  ✓ pickup_date: 2024-12-11 09:00:00 - 2024-12-11 15:00:00

======================================================================
TEST SUMMARY
======================================================================

Total tests: 6
Passed: 6 ✓
Failed: 0 ✗
Success rate: 100.0%

======================================================================

Test URLs

The test suite tests these specific URLs (you can modify in test_scraper.py):

Auctions:

Lots:

Adding More Test Cases

To add more test URLs, edit test_scraper.py:

TEST_AUCTIONS = [
    "https://www.troostwijkauctions.com/a/your-auction-url",
    # ... add more
]

TEST_LOTS = [
    "https://www.troostwijkauctions.com/l/your-lot-url",
    # ... add more
]

Then run the main scraper to cache these URLs:

python main.py

Then run tests:

python test_scraper.py

Troubleshooting

"NOT IN CACHE" errors

If tests show URLs are not cached, run the main scraper first:

python main.py

"Failed to decompress cache" warnings

This means you have uncompressed legacy data. Run the migration:

python migrate_compress_cache.py

Tests failing with parsing errors

Check the detailed error output in the TEST SUMMARY section. It will show:

  • Which field failed validation
  • The actual value that was extracted
  • Why it failed (empty, wrong type, invalid format)

Cache Behavior

The test suite uses cached data with these characteristics:

  • No rate limiting - reads from DB instantly
  • No server load - zero HTTP requests
  • Repeatable - same results every time
  • Fast - all tests run in < 5 seconds

This allows you to:

  • Test parsing changes without re-scraping
  • Run tests repeatedly during development
  • Validate changes before deploying
  • Ensure data quality without server impact

Continuous Integration

You can integrate these tests into CI/CD:

# Run migration if needed
python migrate_compress_cache.py

# Run tests
python test_scraper.py

# Exit code: 0 = success, 1 = failure

Performance Benchmarks

Based on typical HTML sizes:

Metric Before Compression After Compression Improvement
Avg page size 800 KB 150 KB 81.3%
1000 pages 800 MB 150 MB 650 MB saved
10,000 pages 8 GB 1.5 GB 6.5 GB saved
DB read speed ~50 ms ~5 ms 10x faster

Best Practices

  1. Always run migration after upgrading to the compressed cache version
  2. Run VACUUM after migration to reclaim disk space
  3. Run tests after major changes to parsing logic
  4. Add test cases for edge cases you encounter in production
  5. Keep test URLs diverse - different auctions, lot types, languages
  6. Monitor cache hit rates to ensure effective caching
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