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@renovate renovate bot commented Oct 8, 2025

This PR contains the following updates:

Package Change Age Confidence
MSTest.TestAdapter 3.11.1 -> 4.0.2 age confidence
MSTest.TestFramework 3.11.1 -> 4.0.2 age confidence

Release Notes

microsoft/testfx (MSTest.TestAdapter)

v4.0.2

See the release notes here

v4.0.1

See the release notes here

v4.0.0

What is new?
Assert.That

MSTest v4 adds a new type of assertion, that allows you to write any expression, and it will inspect the result to give you more information on failure. Providing a very flexible way to assert complicated expressions. Here a simple example:

[TestClass]
public sealed class Test1
{
    [TestMethod]
    public void TestMethod1()
    {
        var animal = "Tiger";
        var zoo = new Zoo();
        Assert.That(() => zoo.GetAnimal() == animal);
    }
}

public class Zoo
{
    public string GetAnimal()
    {
        return "Giraffe";
    }
}
Assert.That(() => zoo.GetAnimal() == animal) failed.
Details:
    animal = "Tiger"     
    zoo.GetAnimal() = "Giraffe"
CallerArgumentExpression

CallerArgumentExpression is consumed by all assertions, to make them aware of the expressions used in the assertion. In the example below, we now know what both the expected and actual values are. But also what value they come from, giving us opportunity to provide better error messages:

[TestClass]
public sealed class Test1
{
    [TestMethod]
    public void TestMethod1()
    {
        string animal = null;
        Assert.AreEqual("Giraffe", animal);
    }
}
Error Message: Assert.AreEqual failed. Expected:<Giraffe>. Actual:<>. 
'expected' expression: '"Giraffe"', 'actual' expression: 'animal'.
Breaking changes

We hidden many types that should have never been public in the first place. We believe that most of the changes won't have any real user impact. For the changes where we expect user impact migration guide from v3 is provided: https://learn.microsoft.com/dotnet/core/testing/unit-testing-mstest-migration-v3-v4

See the MSTest changelog here: https://github.com/microsoft/testfx/blob/main/docs/Changelog.md#4.0.0
See the Microsoft.Testing.Platform changelog here: https://github.com/microsoft/testfx/blob/main/docs/Changelog-Platform.md#2.0.0

Full changelog here: microsoft/testfx@v3.11.0...v4.0.0


Configuration

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This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch from a198bc9 to 49425a5 Compare October 14, 2025 15:11
@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch from 49425a5 to f697827 Compare October 27, 2025 10:37
@viceice viceice mentioned this pull request Nov 6, 2025
@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch 3 times, most recently from 794e150 to bdeb06a Compare November 11, 2025 16:52
@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch from bdeb06a to 75d554d Compare November 18, 2025 13:19
@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch 5 times, most recently from ff15b4a to 2309e17 Compare December 15, 2025 08:00
@renovate renovate bot force-pushed the renovate/major-mstest-monorepo branch from 2309e17 to cb5973f Compare December 15, 2025 08:06
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3 participants