Add a simple unit test for reading an slnx file

test/Ionide.ProjInfo.Tests/TestAssets.fs

@@ -357,3 +357,12 @@ let ``sample 13 sln with solution files`` = {
     TargetFrameworks = Map.empty
     ProjectReferences = []
 }
+
+// A test with a .slnx format solution file
+let ``sample 14 slnx solution`` = {
+    ProjDir = "sample-14-slnx-solution"
+    AssemblyName = ""
+    ProjectFile = "sample-14-slnx-solution.slnx"
+    TargetFrameworks = Map.empty
+    ProjectReferences = []
+}

test/Ionide.ProjInfo.Tests/Tests.fs

@@ -2331,6 +2331,28 @@ let sample13SolutionFilesTest toolsPath loaderType workspaceFactory =
             | _ -> failtestf "Expected a folder, but got %A" solutionItem.Kind
         )
 
+let sample14SlnxFileTest toolsPath loaderType workspaceFactory =
+    testCase
+        $"Can load sample14 slnx file test - {loaderType}"
+        (fun () ->
+
+            let projPath = pathForProject ``sample 14 slnx solution``
+            let slnDir = Path.GetDirectoryName projPath
+
+            let solutionContents =
+                InspectSln.tryParseSln projPath
+                |> getResult
+
+            let expectedProject = solutionContents.Items[0]
+
+            let expectedProjectPath = Path.Combine(slnDir, "proj1", "proj1.fsproj")
+            Expect.equal expectedProject.Name expectedProjectPath "Should have the expected project path"
+
+            match expectedProject.Kind with
+            | InspectSln.MSBuildFormat items -> Expect.isEmpty items "we don't currently store anything here"
+            | _ -> failtestf "Expected a project, but got %A" expectedProject.Kind
+        )
+
 let tests toolsPath =
     let testSample3WorkspaceLoaderExpected = [
         ExpectNotification.loading "c1.fsproj"
@@ -2466,4 +2488,7 @@ let tests toolsPath =
 
         sample13SolutionFilesTest toolsPath (nameof (WorkspaceLoader)) WorkspaceLoader.Create
         sample13SolutionFilesTest toolsPath (nameof (WorkspaceLoaderViaProjectGraph)) WorkspaceLoaderViaProjectGraph.Create
+
+        sample14SlnxFileTest toolsPath (nameof (WorkspaceLoader)) WorkspaceLoader.Create
+        sample14SlnxFileTest toolsPath (nameof (WorkspaceLoaderViaProjectGraph)) WorkspaceLoaderViaProjectGraph.Create
     ]

test/examples/sample-14-slnx-solution/proj1/Library.fs

@@ -0,0 +1,5 @@
+namespace proj1
+
+module Say =
+    let hello name =
+        printfn "Hello %s" name

test/examples/sample-14-slnx-solution/proj1/proj1.fsproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="Library.fs" />
+  </ItemGroup>
+
+</Project>

test/examples/sample-14-slnx-solution/sample-14-slnx-solution.slnx

@@ -0,0 +1,3 @@
+<Solution>
+  <Project Path="proj1/proj1.fsproj" />
+</Solution>