Initial import

src/shared/stdio.test.ts

@@ -0,0 +1,35 @@
+import { JSONRPCMessage } from "../types/index.js";
+import { ReadBuffer } from "./stdio.js";
+
+const testMessage: JSONRPCMessage = {
+  jsonrpc: "2.0",
+  method: "foobar",
+};
+
+test("should have no messages after initialization", () => {
+  const readBuffer = new ReadBuffer();
+  expect(readBuffer.readMessage()).toBeNull();
+});
+
+test("should only yield a message after a newline", () => {
+  const readBuffer = new ReadBuffer();
+
+  readBuffer.append(Buffer.from(JSON.stringify(testMessage)));
+  expect(readBuffer.readMessage()).toBeNull();
+
+  readBuffer.append(Buffer.from("\n"));
+  expect(readBuffer.readMessage()).toEqual(testMessage);
+  expect(readBuffer.readMessage()).toBeNull();
+});
+
+test("should be reusable after clearing", () => {
+  const readBuffer = new ReadBuffer();
+
+  readBuffer.append(Buffer.from("foobar"));
+  readBuffer.clear();
+  expect(readBuffer.readMessage()).toBeNull();
+
+  readBuffer.append(Buffer.from(JSON.stringify(testMessage)));
+  readBuffer.append(Buffer.from("\n"));
+  expect(readBuffer.readMessage()).toEqual(testMessage);
+});