test: port instance HttpApi path/vcs read coverage to Effect

packages/opencode/test/server/httpapi-pty-websocket.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, test } from "bun:test"
+import { Effect } from "effect"
+import { handlePtyInput } from "../../src/pty/input"
+
+describe("pty HttpApi websocket input", () => {
+  test("does not forward invalid binary frames to the PTY handler", async () => {
+    const messages: Array<string | ArrayBuffer> = []
+    const handler = { onMessage: (message: string | ArrayBuffer) => messages.push(message) }
+
+    await Effect.runPromise(handlePtyInput(handler, "ready"))
+    await Effect.runPromise(handlePtyInput(handler, new Uint8Array([0xff, 0xfe, 0xfd])))
+    await Effect.runPromise(handlePtyInput(handler, new TextEncoder().encode("hello")))
+
+    expect(messages).toEqual(["ready", "hello"])
+  })
+})