Added test to check that all markdown files mentioned in relationships exist

Author: lexler

website/tests/unit/relationship-integrity.test.ts

@@ -0,0 +1,32 @@
+import * as fs from 'fs'
+import * as path from 'path'
+import { getAllRelationships } from '@/lib/relationships'
+
+describe('Relationship Graph Integrity', () => {
+  it('should have markdown files for all nodes referenced in relationships.mmd', () => {
+    const { relationships } = getAllRelationships()
+    const missingFiles: string[] = []
+    const documentsDir = path.join(__dirname, '../../..', 'documents')
+    const checkedSlugs = new Set<string>()
+
+    relationships.forEach(rel => {
+      [rel.from, rel.to].forEach(fullSlug => {
+        if (checkedSlugs.has(fullSlug)) return
+        checkedSlugs.add(fullSlug)
+
+        const [category, slug] = fullSlug.split('/')
+        const markdownPath = path.join(documentsDir, category, `${slug}.md`)
+
+        if (!fs.existsSync(markdownPath)) {
+          missingFiles.push(fullSlug)
+        }
+      })
+    })
+
+    if (missingFiles.length > 0) {
+      throw new Error(
+        `Relationships reference missing markdown files:\n${missingFiles.map(f => `  - ${f}`).join('\n')}`
+      )
+    }
+  })
+})