Coding⏱️ 2 min read📅 2026-05-30

How to Fix: How do you test that a Python function throws an exception

Write a unit test using Python's unittest framework to assert the expected exception is thrown.

Quick Answer: Use the assertRaises context manager or the expectedException assertion.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

To test that a Python function throws an exception, you can use the assertRaises context manager or the try-except block. This ensures that your code fails only if a function doesn't throw an expected exception.

⚠️ Common Causes

  • Using the assertRaises context manager without specifying the expected exception.

🚀 How to Resolve This Issue

Method 1: Using the assertRaises Context Manager

  1. Step 1: Import the unittest module and create a test case.

Method 2: Using the try-except Block

  1. Step 1: Define a test function that calls the function to be tested and catches any exceptions.

💡 Conclusion

By using either of these methods, you can ensure that your Python functions throw the expected exceptions.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Stuck in tutorial hell after 4 years: How do I b

Learn to build websites and think independently with coding skills.

How to Fix: Trying to sync mutliple audio tracks to a movie

Complex audio track synchronization can be challenging due to the larg

How to Fix: Failed to merge latest branches from upstream re

Update local repository with latest upstream branches.