chore: import upstream snapshot with attribution

showcase/scripts/lib/essential-content.test.ts

@@ -0,0 +1,40 @@
+import { describe, it, expect } from "vitest";
+import { checkEssentialContent } from "./essential-content.js";
+
+describe("checkEssentialContent", () => {
+  it("flags a quickstart page missing the 'run agent' section", () => {
+    const result = checkEssentialContent({
+      path: "integrations/mastra/quickstart.mdx",
+      body: "# QS\n\nInstall the CLI.\n",
+    });
+    expect(result.status).toBe("fail");
+    expect(result.messages.join(" ").toLowerCase()).toContain("run");
+  });
+
+  it("passes a quickstart page with all required elements", () => {
+    const body = `# QS
+## Install
+\`\`\`bash
+npm install
+\`\`\`
+## Run your agent
+## Wire CopilotKit provider
+## Try it
+`;
+    const result = checkEssentialContent({
+      path: "integrations/mastra/quickstart.mdx",
+      body,
+    });
+    expect(result.status).toBe("pass");
+  });
+
+  it("uses the feature-page checklist for non-quickstart pages", () => {
+    const body = "# Frontend Tools\n\nWhat is this? Something.\n";
+    const result = checkEssentialContent({
+      path: "integrations/mastra/frontend-tools.mdx",
+      body,
+    });
+    expect(result.status).toBe("fail");
+    expect(result.messages.join(" ").toLowerCase()).toContain("code sample");
+  });
+});