Fix random csproj generation

Author: jviau

test/Azure.Functions.Sdk.Tests/Integration/MSBuildSdkTestBase.cs

@@ -54,7 +54,7 @@ protected virtual void Dispose(bool disposing)
     }
 
     // Ensure this starts with a non-numeric character to be a valid csproj name.
-    protected string GetTempCsproj() => "azfunc.test." + _temp.GetRandomFile(ext: ".csproj");
+    protected string GetTempCsproj() => _temp.GetRandomCsproj();
 
     private static string GetArtifactsPath()
     {

test/Azure.Functions.Sdk.Tests/Tasks/Extensions/ResolveExtensionPackagesTests.cs

@@ -156,7 +156,7 @@ private static ResolveExtensionPackages CreateTask(
     private string RestoreProject(Action<ProjectCreator>? configure = null)
     {
         ProjectCreator project = ProjectCreator.Templates.NetCoreProject(
-            path: _temp.GetRandomFile(ext: ".csproj"), targetFramework: "net8.0", configure: configure);
+            path: _temp.GetRandomCsproj(), targetFramework: "net8.0", configure: configure);
 
         project.Restore().Should().BeSuccessful(); // use assertion to throw on failure.
         project.TryGetPropertyValue("ProjectAssetsFile", out string? value);

test/Azure.Functions.Sdk.Tests/TempDirectory.cs

@@ -15,6 +15,14 @@ public TempDirectory()
 
     public string Path { get; }
 
+    public string GetRandomCsproj()
+    {
+        // This will become RootNamespace. Ensure it is a valid root namespace. GetRandomFileName()
+        // can return invalid namespaces.
+        string name = "azfunc.test_" + IOPath.GetRandomFileName().Replace('.', '_') + ".csproj";
+        return IOPath.Combine(Path, name);
+    }
+
     public string GetRandomFile(string? ext = null)
     {
         string path = IOPath.Combine(Path, IOPath.GetRandomFileName());