test(ai): add jest config and simple test

Author: gwardwell

packages/ai/config/jest/setup.ts

@@ -0,0 +1,44 @@
+//@ts-ignore
+globalThis.__DEV__ = true;
+
+import { TextDecoder, TextEncoder } from "util";
+import "@testing-library/jest-dom";
+
+global.TextEncoder ??= TextEncoder;
+// @ts-ignore
+global.TextDecoder ??= TextDecoder;
+
+function fail(reason = "fail was called in a test.") {
+  expect(reason).toBe(undefined);
+}
+
+// @ts-ignore
+globalThis.fail = fail;
+
+if (!Symbol.dispose) {
+  Object.defineProperty(Symbol, "dispose", {
+    value: Symbol("dispose"),
+  });
+}
+if (!Symbol.asyncDispose) {
+  Object.defineProperty(Symbol, "asyncDispose", {
+    value: Symbol("asyncDispose"),
+  });
+}
+
+// not available in JSDOM 🙄
+global.structuredClone = (val) => JSON.parse(JSON.stringify(val));
+global.ReadableStream ||= require("stream/web").ReadableStream;
+global.TransformStream ||= require("stream/web").TransformStream;
+
+AbortSignal.timeout = (ms) => {
+  const controller = new AbortController();
+  setTimeout(
+    () =>
+      controller.abort(
+        new DOMException("The operation timed out.", "TimeoutError")
+      ),
+    ms
+  );
+  return controller.signal;
+};

packages/ai/src/mocking/__tests__/AIAdapter.test.ts

@@ -0,0 +1,23 @@
+import { AIAdapter } from "../AIAdapter.js";
+
+class DerivedAdapter extends AIAdapter {
+  constructor() {
+    super();
+  }
+
+  public generateObject(prompt: string): Promise<any> {
+    return Promise.resolve({
+      data: null,
+    });
+  }
+}
+
+describe("AIAdapter derived class", () => {
+  it("should be able to generate an object", async () => {
+    const adapter = new DerivedAdapter();
+    const result = await adapter.generateObject("Hello, world!");
+    expect(result).toEqual({
+      data: null,
+    });
+  });
+});