Use MSTest 3.9.3

[Evangelink]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the MSTest package version to 3.9.3 across multiple test projects and aligns assertion methods with the new MSTest best practices. Key changes include:

• Replacing separate MSTest packages with the consolidated MSTest package.
• Switching from Assert.ThrowsException to Assert.ThrowsExactly for stricter exception verification.
• Adjusting the argument order in Assert.AreEqual calls to pass the expected value first.

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Ordering.UnitTests/Ordering.UnitTests.csproj	Removed deprecated MSTest package references and added the consolidated MSTest package.
tests/Ordering.UnitTests/Domain/OrderAggregateTest.cs	Updated exception assertions and corrected parameter order in Assert.AreEqual calls.
tests/Ordering.UnitTests/Domain/BuyerAggregateTest.cs	Updated exception assertions to use Assert.ThrowsExactly.
tests/Ordering.UnitTests/Application/NewOrderCommandHandlerTest.cs	Updated exception assertions to use Assert.ThrowsExactly.
tests/ClientApp.UnitTests/ViewModels/MockViewModelTests.cs	Adjusted assertion argument order to match best practices.
tests/ClientApp.UnitTests/ViewModels/CatalogViewModelTests.cs	Revised assessment of collection Count to prioritize expected count first.
tests/ClientApp.UnitTests/Services/OrdersServiceTests.cs	Revised Count assertion order in service tests.
tests/ClientApp.UnitTests/Services/CatalogServiceTests.cs	Revised Count assertion order in service tests.
tests/ClientApp.UnitTests/Services/BasketServiceTests.cs	Revised Count assertion order in service tests.
tests/ClientApp.UnitTests/ClientApp.UnitTests.csproj	Removed MSTest.TestAdapter and MSTest.TestFramework and added MSTest 3.9.3.
tests/Basket.UnitTests/BasketServiceTests.cs	Revised collection assertion for basket items.
tests/Basket.UnitTests/Basket.UnitTests.csproj	Removed deprecated MSTest package references and added the consolidated MSTest package.
Directory.Packages.props	Updated MSTest package version and bumped the Microsoft.NET.Test.Sdk version.

[Evangelink]

/azp run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 850 in repo dotnet/eShop