Showed the .NET runtime and SDK actually in use on the information page

app/Tests/Tools/Metadata/DotnetVersionTests.cs

@@ -0,0 +1,41 @@
+using System.Reflection;
+
+using AIStudio.Tools.Metadata;
+
+namespace AIStudio.Tests.Tools.Metadata;
+
+/// <summary>
+/// Checks the versions of .NET which the information page shows.
+/// </summary>
+/// <remarks>
+/// The page names the runtime which runs the app and the SDK which built it, each with the commit it
+/// was built from. Both may differ from what metadata.txt says: a release brings its own runtime, a
+/// development build runs on whatever is installed, and a local build may use another SDK than the
+/// pipeline.
+/// </remarks>
+[TestFixture]
+public sealed class DotnetVersionTests
+{
+    private const string VERSION_WITH_COMMIT = @"^\d+\.\d+\.\d+\S* \(commit [0-9a-f]{10}\)$";
+
+    [TestCase("10.0.14+0427b9abbead3fa64c6655eb4290c537397131fa", ExpectedResult = "10.0.14 (commit 0427b9abbe)", TestName = "A runtime with its commit")]
+    [TestCase("10.0.0-rc.2.25502.107+89c8f6a112d37d2ea8b77821e56d170a1bccdc5a", ExpectedResult = "10.0.14 (commit 89c8f6a112)", TestName = "A runtime whose informational version has a label")]
+    [TestCase("10.0.14", ExpectedResult = "10.0.14", TestName = "A runtime without a commit")]
+    [TestCase("10.0.14+0427b9", ExpectedResult = "10.0.14", TestName = "A runtime with a cut-off commit")]
+    [TestCase("", ExpectedResult = "10.0.14", TestName = "A runtime without an informational version")]
+    [TestCase(null, ExpectedResult = "10.0.14", TestName = "A runtime whose core library names no version")]
+    public string TheRuntimeIsDescribedWithItsCommit(string? informationalVersion) => DotnetRuntimeVersion.Describe(new Version(10, 0, 14), informationalVersion);
+
+    [Test]
+    public void TheRuntimeIsTheOneRunningTheApp()
+    {
+        Assert.That(DotnetRuntimeVersion.Current, Does.StartWith($"{Environment.Version} ").And.Match(VERSION_WITH_COMMIT));
+    }
+
+    [Test]
+    public void TheSdkIsNamedWithItsCommit()
+    {
+        var metaData = typeof(DotnetRuntimeVersion).Assembly.GetCustomAttribute<MetaDataAttribute>();
+        Assert.That(metaData?.DotnetSdkVersion, Does.Match(VERSION_WITH_COMMIT));
+    }
+}