test: add error boundary tests and configure jest-dom

app/(root)/dashboard/error.test.tsx

@@ -0,0 +1,26 @@
+// app/(root)/dashboard/error.test.tsx
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import DashboardError from './error';
+
+function makeError(message: string): Error {
+  const e = new Error(message);
+  return e;
+}
+
+describe('DashboardError', () => {
+  it('shows ⏳ for a rate-limit error', () => {
+    render(<DashboardError error={makeError('API limit reached')} reset={() => {}} />);
+    expect(screen.getByText('⏳')).toBeInTheDocument();
+  });
+
+  it('shows 🕵️‍♂️ for a not-found error', () => {
+    render(<DashboardError error={makeError('User not found')} reset={() => {}} />);
+    expect(screen.getByText('🕵️‍♂️')).toBeInTheDocument();
+  });
+
+  it('shows ⚠️ for a generic error', () => {
+    render(<DashboardError error={makeError('Unexpected failure')} reset={() => {}} />);
+    expect(screen.getByText('⚠️')).toBeInTheDocument();
+  });
+});

vitest.config.ts

@@ -5,6 +5,7 @@ export default defineConfig({
   test: {
     environment: 'jsdom',
     globals: true,
+    setupFiles: ['./vitest.setup.ts'],
     include: ['**/*.test.ts', '**/*.test.tsx'],
     exclude: ['node_modules', '.next'],
     coverage: {

vitest.setup.ts

@@ -0,0 +1,2 @@
+// vitest.setup.ts
+import '@testing-library/jest-dom/vitest';