chore(ImplementationTests): add (non-functional) tests for textDocument/implementation

Author: razzmatazz

tests/CSharpLanguageServer.Tests/CSharpLanguageServer.Tests.fsproj

@@ -25,6 +25,7 @@
     <Compile Include="DiagnoseCommandTests.fs" />
     <Compile Include="SignatureHelpTests.fs" />
     <Compile Include="TypeDefinitionTests.fs" />
+    <Compile Include="ImplementationTests.fs" />
   </ItemGroup>
 
   <ItemGroup>

tests/CSharpLanguageServer.Tests/ImplementationTests.fs

@@ -0,0 +1,25 @@
+module CSharpLanguageServer.Tests.ImplementationTests
+
+open System
+
+open NUnit.Framework
+open Ionide.LanguageServerProtocol.Types
+
+open CSharpLanguageServer.Tests.Tooling
+
+[<Test>]
+let ``test textDocument/implementation works`` () =
+    use client = activateFixture "genericProject"
+    use classFile = client.Open "Project/Class.cs"
+
+    let implementationParams0: ImplementationParams =
+        { TextDocument = { Uri = classFile.Uri }
+          Position = { Line = 10u; Character = 8u }
+          WorkDoneToken = None
+          PartialResultToken = None }
+
+    let implementation0: U2<Definition, DefinitionLink array> option =
+        client.Request("textDocument/implementation", implementationParams0)
+
+    // TODO: fix this test
+    ()