Coding⏱️ 2 min read📅 2026-05-30

How to Fix: How do I properly assert that an exception gets raised in pytest

pytest exception assertion

Quick Answer: Use the `assertRaises` context manager to properly assert that an exception gets raised in pytest.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

To properly assert that an exception gets raised in pytest, we need to understand how pytest's fail() function works. The pytest.fail() function is used to indicate a test failure and it takes two arguments: the error message and whether or not to display the trace back.

🛑 Root Causes of the Error

  • When using pytest.fail(), we need to make sure that the exception we're trying to raise is properly caught and passed to the fail() function.

✅ Best Solutions to Fix It

Method 1: Using assertRaises

  1. Step 1: Use the pytest.raises() context manager to wrap your test function. This will catch any exceptions that occur during the execution of your test function.

Method 2: Using pytrace=True

  1. Step 1: Use the pytest.fail() function with pytrace=True. This will display the trace back of the exception that occurred during your test.

💡 Conclusion

By using pytest.raises() or pytest.fail() with pytrace=True, you can properly assert that an exception gets raised in your tests.

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