test(docker): cover browser install build arg

src/dockerfile.test.ts

@@ -0,0 +1,23 @@
+import { readFile } from "node:fs/promises";
+import { join, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+
+const repoRoot = resolve(fileURLToPath(new URL(".", import.meta.url)), "..");
+const dockerfilePath = join(repoRoot, "Dockerfile");
+
+describe("Dockerfile", () => {
+  it("installs optional browser dependencies after pnpm install", async () => {
+    const dockerfile = await readFile(dockerfilePath, "utf8");
+    const installIndex = dockerfile.indexOf("RUN pnpm install --frozen-lockfile");
+    const browserArgIndex = dockerfile.indexOf("ARG OPENCLAW_INSTALL_BROWSER");
+
+    expect(installIndex).toBeGreaterThan(-1);
+    expect(browserArgIndex).toBeGreaterThan(-1);
+    expect(browserArgIndex).toBeGreaterThan(installIndex);
+    expect(dockerfile).toContain(
+      "node /app/node_modules/playwright-core/cli.js install --with-deps chromium",
+    );
+    expect(dockerfile).toContain("apt-get install -y --no-install-recommends xvfb");
+  });
+});