Ensure that server actually forwards events it does not directly handle

Author: mattmassicotte

Package.resolved

@@ -250,9 +250,7 @@ extension InitializingServer {
 				await handler(AnyJSONRPCResponseError(error: error))
 			}
 		default:
-			print("unhandled request: \(request)")
-
-			await request.relyWithError(InitializingServerError.stateInvalid)
+			break
 		}
 
 		if initResp.capabilities != newCaps {

Sources/LanguageClient/InitializingServer.swift

@@ -87,5 +87,49 @@ final class ServerTests: XCTestCase {
 
 		await fulfillment(of: [registerExp], timeout: 1.0)
 	}
+
+	func testPassesRequestsThrough() async throws {
+		let mockChannel = MockServer()
+		let config = Server.Configuration(
+			serverProvider: { mockChannel },
+			textDocumentItemProvider: { _ in throw ServerTestError.unsupported },
+			initializeParamsProvider: { Self.initParams }
+		)
+		let server = Server(configuration: config)
+
+		let mockRequest = ServerRequest.windowWorkDoneProgressCreate(
+			WorkDoneProgressCreateParams(token: .optionA(1)),
+			{ error in
+				if let error {
+					print(error)
+				}
+
+				XCTFail()
+			}
+		)
+
+		await mockChannel.sendMockResponse(
+"""
+{"capabilities": {"textDocumentSync": 0}}
+"""
+		)
+		_ = try await server.initializeIfNeeded()
+
+		var iterator = server.eventSequence.makeAsyncIterator()
+
+		print("sending")
+		await mockChannel.sendMockRequest(mockRequest)
+
+		print("waiting")
+		let event = await iterator.next()
+
+		guard
+			case let .request(_, request) = event,
+			case .windowWorkDoneProgressCreate = request
+		else {
+			XCTFail()
+			return
+		}
+	}
 }
 #endif