When will you use this?

Use tests when code handles money, login, or anything you cannot afford to break silently.

• xUnit tests catch bugs before deploy — especially payment and auth logic.
• Integration tests spin up your API in memory and call endpoints like a real client.

Real-world: Toolliyo-style learning platform

The EdTech / LMS team building Toolliyo-style learning platform uses Unit Testing with xUnit to test CalculateDiscount returns correct price. students and instructors never see the C# code — they just get a fast, reliable course API and lesson progress tracking.

Production-style code

[Fact]
public void Unit_Testing_with_xUnit_Should_Work()
{
    Assert.True(true); // replace with real test
}

What happens in production: In Toolliyo-style learning platform, getting Unit Testing with xUnit right means students and instructors trust the course API and lesson progress tracking every day.

Lesson example (start here)

Copy this smaller example first. Once it works, compare it with the real-world code above.

[Fact]
public void Unit_Testing_with_xUnit_Should_Work()
{
    Assert.True(true); // replace with real test
}

Line-by-line walkthrough

How it works (big picture)

• Study the example line by line.
• Each part connects to Unit Testing with xUnit.
• Edit one line, save, run dotnet run, and see what changes.

Do this on your computer

1. Add one xUnit test for a service method.
2. Run dotnet test.
3. Break the code on purpose and see the test fail.
4. Read the real-world section and name which part of the app uses this topic.
5. Run the example locally with dotnet run and confirm the same behavior.
6. Change one value in the example (route, text, or connection string) and predict what will happen before you save.

Experiments — try changing this

• Change a string or route in the example and save — watch the browser or Swagger response update.
• Break the code on purpose (remove a semicolon), read the error message, then fix it.
• Use dotnet watch run while editing Unit Testing with xUnit — the app restarts on save.

Remember

You learned what Unit Testing with xUnit is and when to use it in ShopNest. Practice by changing the example yourself. Use the Next link when you can explain it in your own words.

Common questions