test(kiwi): cover component metadata serialization

- Assert verified component library metadata is emitted to NodeChange fields
- Cover component property definitions and variant property specs serialization

tests/engine/kiwi/serialize-fixes/component-metadata.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, test } from 'bun:test'
+
+import { SceneGraph } from '@open-pencil/core'
+
+import { pageId, toKiwi } from './helpers'
+
+describe('component metadata serialization', () => {
+  test('writes verified Figma component metadata fields', () => {
+    const graph = new SceneGraph()
+    const node = graph.createNode('COMPONENT_SET', pageId(graph), {
+      name: 'Button',
+      componentKey: 'component-key',
+      sourceLibraryKey: 'lk-source',
+      publishId: '12:34',
+      overrideKey: '56:78',
+      sharedSymbolVersion: '100:200',
+      publishedVersion: '300:400',
+      isPublishable: true,
+      isSymbolPublishable: true,
+      symbolDescription: 'Button docs',
+      symbolLinks: [{ uri: 'https://example.com/docs', displayName: 'Docs' }],
+      componentPropertyDefinitions: [
+        {
+          id: '90:1',
+          name: 'State',
+          type: 'VARIANT',
+          defaultValue: 'Enabled',
+          variantOptions: ['Enabled']
+        }
+      ],
+      variantPropSpecs: [{ propDefId: '90:1', value: 'Enabled' }]
+    })
+
+    const [kiwi] = toKiwi(node, graph)
+    expect(kiwi.componentKey).toBe('component-key')
+    expect(kiwi.sourceLibraryKey).toBe('lk-source')
+    expect(kiwi.publishID).toEqual({ sessionID: 12, localID: 34 })
+    expect(kiwi.overrideKey).toEqual({ sessionID: 56, localID: 78 })
+    expect(kiwi.sharedSymbolVersion).toBe('100:200')
+    expect(kiwi.publishedVersion).toBe('300:400')
+    expect(kiwi.isPublishable).toBe(true)
+    expect(kiwi.isSymbolPublishable).toBe(true)
+    expect(kiwi.symbolDescription).toBe('Button docs')
+    expect(kiwi.symbolLinks).toEqual([{ uri: 'https://example.com/docs', displayName: 'Docs' }])
+    expect(kiwi.componentPropDefs).toEqual([
+      {
+        id: { sessionID: 90, localID: 1 },
+        name: 'State',
+        type: 'VARIANT',
+        initialValue: { textValue: { characters: 'Enabled' } }
+      }
+    ])
+    expect(kiwi.variantPropSpecs).toEqual([
+      { propDefId: { sessionID: 90, localID: 1 }, value: 'Enabled' }
+    ])
+  })
+})