Suppress dependency rebuilding in integration tests on windows+net7.0

Author: AndreyAkinshin

src/BenchmarkDotNet/Helpers/XUnitHelper.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Linq;
+
+namespace BenchmarkDotNet.Helpers;
+
+internal static class XUnitHelper
+{
+    public static Lazy<bool> IsIntegrationTest =
+        new (() => AppDomain.CurrentDomain.GetAssemblies().Any(assembly => assembly.GetName().Name == "BenchmarkDotNet.IntegrationTests"));
+}

src/BenchmarkDotNet/Toolchains/DotNetCli/DotNetCliCommand.cs

@@ -4,6 +4,7 @@
 using System.Text;
 using BenchmarkDotNet.Characteristics;
 using BenchmarkDotNet.Extensions;
+using BenchmarkDotNet.Helpers;
 using BenchmarkDotNet.Jobs;
 using BenchmarkDotNet.Loggers;
 using BenchmarkDotNet.Portability;
@@ -73,9 +74,21 @@ public BuildResult RestoreThenBuild()
             if (!restoreResult.IsSuccess)
                 return BuildResult.Failure(GenerateResult, restoreResult.AllInformation);
 
-            var buildResult = BuildNoRestore();
-            if (!buildResult.IsSuccess && RetryFailedBuildWithNoDeps) // if we fail to do the full build, we try with --no-dependencies
+            // On our CI (Windows+.NET 7), Integration tests take to much time because each benchmark run rebuilds the BenchmarkDotNet itself.
+            // To reduce the total duration of the CI workflows, we build all the projects without dependencies
+            bool forceNoDependencies = XUnitHelper.IsIntegrationTest.Value &&
+                                       RuntimeInformation.IsWindows() &&
+                                       RuntimeInformation.IsNetCore;
+
+            DotNetCliCommandResult buildResult;
+            if (forceNoDependencies)
                 buildResult = BuildNoRestoreNoDependencies();
+            else
+            {
+                buildResult = BuildNoRestore();
+                if (!buildResult.IsSuccess && RetryFailedBuildWithNoDeps) // if we fail to do the full build, we try with --no-dependencies
+                    buildResult = BuildNoRestoreNoDependencies();
+            }
 
             return buildResult.ToBuildResult(GenerateResult);
         }

tests/BenchmarkDotNet.IntegrationTests/IntegrationTestSetupTests.cs

@@ -0,0 +1,10 @@
+using BenchmarkDotNet.Helpers;
+using Xunit;
+
+namespace BenchmarkDotNet.IntegrationTests;
+
+public class IntegrationTestSetupTests
+{
+    [Fact]
+    public void IntegrationTestsAreDetected() => Assert.True(XUnitHelper.IsIntegrationTest.Value);
+}