Fix Wasm.Build.Tests failures

- Use latest sdk for testing
- Add dotnet8 feed, needed by blazorwasm templates

- Workaround a bug in 7.0 templates which will be fixed by
#76373 . And this can be removed
once we have packages with that.

Author: radical

eng/Versions.props

@@ -177,7 +177,7 @@
     <GrpcDotnetClientVersion>2.45.0</GrpcDotnetClientVersion>
     <GrpcToolsVersion>2.45.0</GrpcToolsVersion>
     <!-- Uncomment to set a fixed version, else the latest is used -->
-    <SdkVersionForWorkloadTesting>8.0.100-alpha.1.22463.23</SdkVersionForWorkloadTesting>
+    <!--<SdkVersionForWorkloadTesting>8.0.100-alpha.1.22463.23</SdkVersionForWorkloadTesting>-->
     <CompilerPlatformTestingVersion>1.1.2-beta1.22403.2</CompilerPlatformTestingVersion>
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>7.0.0-preview-20220920.1</MicrosoftPrivateIntellisenseVersion>

src/mono/wasm/Wasm.Build.Tests/WasmTemplateTests.cs

@@ -222,9 +222,19 @@ private void ConsoleBuildAndRun(string config, bool relinking, string extraNewAr
 
             (int exitCode, string output) = RunProcess(s_buildEnv.DotNet, _testOutput, args: $"run --no-build -c {config} x y z", workingDir: _projectDir);
             Assert.Equal(42, exitCode);
-            Assert.Contains("args[0] = x", output);
-            Assert.Contains("args[1] = y", output);
-            Assert.Contains("args[2] = z", output);
+            if (extraNewArgs.Contains("-f net7.0"))
+            {
+                // Workaround for https://github.com/dotnet/runtime/issues/76201
+                Assert.Contains("args[0] = dotnet", output);
+                Assert.Contains("args[1] = is", output);
+                Assert.Contains("args[2] = great!", output);
+            }
+            else
+            {
+                Assert.Contains("args[0] = x", output);
+                Assert.Contains("args[1] = y", output);
+                Assert.Contains("args[2] = z", output);
+            }
         }
 
         public static TheoryData<bool, bool, string> TestDataForAppBundleDir()

src/mono/wasm/Wasm.Build.Tests/data/nuget7.config

@@ -8,6 +8,7 @@
   <packageSources>
     <clear />
     <!-- TEST_RESTORE_SOURCES_INSERTION_LINE -->
+    <add key="dotnet8" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json" />
     <add key="dotnet7" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json" />
     <add key="nuget.org"  value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
   </packageSources>