Testing New Features in the Playlist Calculator

Before every release, we run through a small checklist to make sure the playlist calculator behaves exactly as you expect. Here is the short version of that routine so you can follow along—or even replicate it locally if you are curious.

1. Data accuracy

• Paste a known playlist ID with a fixed number of videos
• Confirm video counts, watch time, and unavailable items match YouTube Studio
• Verify the human-readable summary matches HH:MM:SS totals

2. Speed calculations

We recalculate the time at preset speeds (1.25x, 1.5x, 1.75x, 2x) and compare the results against a spreadsheet reference. Small differences are acceptable (floating-point rounding happens), but the margin should never exceed a second.

3. API key handling

• Test without supplying a key (expects an informative message)
• Test with a valid key (should produce a full report)
• Test with an intentionally limited key to ensure we surface quota errors cleanly

4. Locale and translations

Switch through the available languages to confirm the form labels, status messages, and blog navigation translate correctly. Missing translations should show up immediately, thanks to how we log them in development.

5. Snapshot a regression log

We take a quick note of the playlist ID, expected results, and browser console output. It sounds tedious, but it makes future releases faster.

If you discover a corner case we missed, feel free to drop us an issue or PR. Happy testing!