Coding⏱️ 2 min read📅 2026-05-31

How to Fix: How do I use Assert.Throws to assert the type of the exception?

Assert.Throws to assert the type of exception and actual message wording.

Quick Answer: Use Assert.Throws with a specific exception type and message, like this: Assert.Throws(() => user.MakeUserActive()).WithMessage(

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

To use Assert.Throws to assert the type of the exception and its actual message wording, you can utilize the WithMessage method in combination with a Func<T> delegate that returns an Exception object.

🛑 Root Causes of the Error

  • The issue arises when using Assert.Throws<Exception>, as it only checks for the presence of an exception, but does not verify its message.

✅ Best Solutions to Fix It

Method 1: Using a Func<T>

  1. Step 1: Create a Func<Exception, bool> delegate that checks the exception's message.

Method 2: Using Assert.Throws with Message

  1. Step 1: Use Assert.Throws<Exception>(Func<Exception, bool>) to check for the presence of an exception.

✨ Wrapping Up

By utilizing these methods, you can effectively use Assert.Throws to assert the type of the exception and its actual message wording.

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