1. Set up a separate test project with the naming convention `[ProjectName].Tests`.
2. Reference the necessary NuGet packages: `Microsoft.NET.Test.Sdk`, `NUnit`, and `NUnit3TestAdapter`.
3. Create test classes that match the classes being tested (e.g., `CalculatorTests` for `Calculator`).
4. Apply the `[TestFixture]` attribute to test classes and the `[Test]` attribute to test methods.
5. Follow the Arrange-Act-Assert (AAA) pattern in your test methods.
6. Use `Assert.That` with the constraint model for assertions.
7. Implement data-driven tests using `[TestCase]` or `[TestCaseSource]`.
8. Organize tests by feature or component using categories with `[Category("CategoryName")]`.
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