add blink init happy path test

Author: hugodutka

packages/blink/src/cli/init.test.ts

@@ -1,5 +1,8 @@
 import { describe, it, expect } from "bun:test";
 import { getFilesForTemplate } from "./init";
+import { render, BLINK_COMMAND, makeTmpDir, KEY_CODES } from "./lib/terminal";
+import { join } from "path";
+import { readFile } from "fs/promises";
 
 const getFile = (files: Record<string, string>, filename: string): string => {
   const fileContent = files[filename];
@@ -212,3 +215,43 @@ describe("getFilesForTemplate", () => {
     });
   });
 });
+
+describe("init command", () => {
+  it("scratch template, happy path", async () => {
+    await using tempDir = await makeTmpDir();
+    using term = render(`${BLINK_COMMAND} init`, { cwd: tempDir.path });
+    await term.waitUntil((screen) => screen.includes("Scratch"));
+    // by default, the first option should be selected. Scratch is second in the list.
+    expect(term.getScreen()).not.toContain("Basic agent with example tool");
+    term.write(KEY_CODES.DOWN);
+    await term.waitUntil((screen) =>
+      screen.includes("Basic agent with example tool")
+    );
+    term.write(KEY_CODES.ENTER);
+    await term.waitUntil((screen) =>
+      screen.includes("Which AI provider do you want to use?")
+    );
+    term.write(KEY_CODES.ENTER);
+    await term.waitUntil((screen) =>
+      screen.includes("Enter your OpenAI API key:")
+    );
+    term.write("sk-test-123");
+    term.write(KEY_CODES.ENTER);
+    await term.waitUntil((screen) =>
+      screen.includes("What package manager do you want to use?")
+    );
+    const screen = term.getScreen();
+    expect(screen).toContain("Bun");
+    expect(screen).toContain("NPM");
+    expect(screen).toContain("PNPM");
+    expect(screen).toContain("Yarn");
+    term.write(KEY_CODES.ENTER);
+    await term.waitUntil((screen) =>
+      screen.includes("API key saved to .env.local")
+    );
+    await term.waitUntil((screen) => screen.includes("To get started, run:"));
+    const envFilePath = join(tempDir.path, ".env.local");
+    const envFileContent = await readFile(envFilePath, "utf-8");
+    expect(envFileContent.split("\n")).toContain("OPENAI_API_KEY=sk-test-123");
+  });
+});

packages/blink/src/cli/lib/terminal.ts

@@ -1,10 +1,12 @@
 import {
   spawn,
   spawnSync,
-  ChildProcessWithoutNullStreams,
+  type ChildProcessWithoutNullStreams,
 } from "node:child_process";
 import { Terminal } from "@xterm/headless";
 import { join } from "path";
+import { mkdtemp, rm } from "fs/promises";
+import { tmpdir } from "os";
 
 export interface RenderOptions {
   cols?: number;
@@ -218,3 +220,26 @@ export function render(
 ): TerminalInstance {
   return new TerminalInstanceImpl(command, options);
 }
+
+export async function makeTmpDir(): Promise<
+  AsyncDisposable & { path: string }
+> {
+  const dirPath = await mkdtemp(join(tmpdir(), "blink-tmp-"));
+  return {
+    path: dirPath,
+    [Symbol.asyncDispose](): Promise<void> {
+      return rm(dirPath, { recursive: true });
+    },
+  };
+}
+
+export const KEY_CODES = {
+  ENTER: "\r",
+  TAB: "\t",
+  BACKSPACE: "\x08",
+  DELETE: "\x7f",
+  UP: "\x1b[A",
+  DOWN: "\x1b[B",
+  LEFT: "\x1b[D",
+  RIGHT: "\x1b[C",
+} as const;