test(e2e): Update e2e tests to support newer spec submodule

.gitignore

@@ -351,5 +351,7 @@ ASALocalRun/
 # integration tests
 test/OpenFeature.E2ETests/Features/*.feature
 test/OpenFeature.E2ETests/Features/*.feature.cs
+test/OpenFeature.E2ETests/Features/README.md
+test/OpenFeature.E2ETests/Features/test-flags.json
 cs-report.json
 specification.json

test/OpenFeature.E2ETests/OpenFeature.E2ETests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFrameworks>net8.0;net9.0</TargetFrameworks>
@@ -18,6 +18,7 @@
     </PackageReference>
     <PackageReference Include="Reqnroll.xUnit" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="NSubstitute" />
     <PackageReference Include="xunit" />
     <PackageReference Include="xunit.runner.visualstudio">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
@@ -35,7 +36,15 @@
     <ItemGroup>
       <GherkinFiles Include="..\..\spec\specification\assets\gherkin\*" />
     </ItemGroup>
-    <Copy SourceFiles="@(GherkinFiles)" DestinationFolder="Features/"/>
+    <Copy SourceFiles="@(GherkinFiles)" DestinationFolder="Features/" />
   </Target>
 
+  <!-- Only link test-flags.json if the submodule is cloned -->
+  <!-- If no submodule is cloned, Reqnroll wont generate the e2e tests -->
+  <ItemGroup Condition="Exists('..\..\spec\specification\assets\gherkin\test-flags.json')">
+    <None Include="..\..\spec\specification\assets\gherkin\test-flags.json" Link="Features\test-flags.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>