Overview
This is an extension that generates unit tests from the AtCoder problem page.
1. Open the AtCoder problem page
2. Click the icon on the toolbar
3. "Paste" in any editor
Now you are ready to run your unit tests.
When you run a test, it sends example input to the program and checks the output.
All green is OK. Submit it!
Tips: Since the contents of standard output (stdout) are captured, when debugging printf, go to error output (stderr).
Supported languages: Python3 (unittest), Java (JUnit5), Kotlin (JUnit5), C# (MS Test), Go, Ruby (RSpec)
Tags
Privacy Practices
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Not being sold to third parties, outside of the approved use cases
✓
Not being used or transferred for purposes that are unrelated to the item's core functionality
✓
Not being used or transferred to determine creditworthiness or for lending purposes
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Created from revision 3cde211b0c on 10/20/2025.