Add seed data component initialization tests

frontends/nextjs/src/seed-data/components.test.ts

@@ -0,0 +1,75 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest'
+
+const { getComponentConfigs, addComponentConfig } = vi.hoisted(() => ({
+  getComponentConfigs: vi.fn(),
+  addComponentConfig: vi.fn(),
+}))
+
+vi.mock('@/lib/database', () => ({
+  Database: {
+    getComponentConfigs,
+    addComponentConfig,
+  },
+}))
+
+import { initializeComponents } from '@/seed-data/components'
+
+const expectedConfigs = [
+  {
+    id: 'config_home_heading',
+    componentId: 'node_home_heading',
+    props: {
+      level: 1,
+      children: 'Welcome to MetaBuilder',
+    },
+  },
+  {
+    id: 'config_home_subtitle',
+    componentId: 'node_home_subtitle',
+    props: {
+      children: 'Build multi-tenant applications without writing code',
+    },
+  },
+  {
+    id: 'config_home_button',
+    componentId: 'node_home_button',
+    props: {
+      children: 'Get Started',
+      variant: 'default',
+      size: 'lg',
+    },
+  },
+]
+
+describe('initializeComponents', () => {
+  beforeEach(() => {
+    getComponentConfigs.mockReset()
+    addComponentConfig.mockReset()
+  })
+
+  it.each([
+    {
+      name: 'skip seeding when configs exist',
+      existingConfigs: { existing: { id: 'existing' } },
+      expectedAddCount: 0,
+    },
+    {
+      name: 'seed defaults when no configs exist',
+      existingConfigs: {},
+      expectedAddCount: expectedConfigs.length,
+    },
+  ])('should $name', async ({ existingConfigs, expectedAddCount }) => {
+    getComponentConfigs.mockResolvedValue(existingConfigs)
+
+    await initializeComponents()
+
+    expect(getComponentConfigs).toHaveBeenCalledTimes(1)
+    expect(addComponentConfig).toHaveBeenCalledTimes(expectedAddCount)
+
+    if (expectedAddCount > 0) {
+      expectedConfigs.forEach(config => {
+        expect(addComponentConfig).toHaveBeenCalledWith(expect.objectContaining(config))
+      })
+    }
+  })
+})