Fix DocumentSymbol Json Converter

src/Protocol/Serialization/Converters/SymbolInformationOrDocumentSymbolConverter.cs

@@ -27,8 +27,8 @@ public override SymbolInformationOrDocumentSymbol ReadJson(JsonReader reader, Ty
         {
             var result = JObject.Load(reader);
 
-            // Commands have a name, CodeActions do not
-            if (result["location"].Type == JTokenType.Object)
+            // SymbolInformation has property location, DocumentSymbol does not.
+            if (result["location"] != null)
             {
                 return new SymbolInformationOrDocumentSymbol(result.ToObject<SymbolInformation>());
             }

test/Client.Tests/ClientTests.cs

@@ -373,6 +373,56 @@ public async Task DocumentHighlights_Success()
             });
         }
 
+        /// <summary>
+        ///     Ensure that the language client can successfully request DocumentHighlight.
+        /// </summary>
+        [Fact(DisplayName = "Language client can successfully request document symbols")]
+        public async Task DocumentSymbols_DocumentSymbol_Success()
+        {
+            await Connect();
+
+            const int line = 5;
+            const int character = 6;
+            var expectedDocumentPath = AbsoluteDocumentPath;
+            var expectedDocumentUri = DocumentUri.FromFileSystemPath(expectedDocumentPath);
+            var detail = "some detail";
+
+            var documentSymbol = new DocumentSymbol {
+                Detail = detail,
+                Kind = SymbolKind.Class,
+                Range = new Range(new Position(line, character), new Position(line, character))
+            };
+            var expectedSymbols = new SymbolInformationOrDocumentSymbolContainer(
+                new SymbolInformationOrDocumentSymbol(documentSymbol));
+
+            ServerDispatcher.HandleRequest<DocumentSymbolParams, SymbolInformationOrDocumentSymbolContainer>(DocumentNames.DocumentSymbol, (request, cancellationToken) => {
+                Assert.NotNull(request.TextDocument);
+
+                Assert.Equal(expectedDocumentUri, request.TextDocument.Uri);
+
+                return Task.FromResult(expectedSymbols);
+            });
+            var documentSymbolParams = new DocumentSymbolParams {
+                TextDocument = new TextDocumentIdentifier(expectedDocumentUri)
+            };
+            var symbols = await LanguageClient.SendRequest<SymbolInformationOrDocumentSymbolContainer>(DocumentNames.DocumentSymbol, documentSymbolParams);
+
+            var actualSymbols = symbols.ToArray();
+            Assert.Collection(actualSymbols, actualSymbol => {
+                var expectedSymbol = expectedSymbols.Single();
+
+                Assert.True(expectedSymbol.IsDocumentSymbol);
+
+                Assert.NotNull(actualSymbol.DocumentSymbol);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Detail, actualSymbol.DocumentSymbol.Detail);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Kind, actualSymbol.DocumentSymbol.Kind);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Range.Start.Line, actualSymbol.DocumentSymbol.Range.Start.Line);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Range.Start.Character, actualSymbol.DocumentSymbol.Range.Start.Character);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Range.End.Line, actualSymbol.DocumentSymbol.Range.End.Line);
+                Assert.Equal(expectedSymbol.DocumentSymbol.Range.End.Character, actualSymbol.DocumentSymbol.Range.End.Character);
+            });
+        }
+
         /// <summary>
         ///     Ensure that the language client can successfully request FoldingRanges.
         /// </summary>