Migrate legacy reroute to litegraph native reroute (#3151)

Co-authored-by: github-actions <github-actions@github.com>

tests-ui/tests/utils/migration/migrateReroute.test.ts

@@ -0,0 +1,35 @@
+import fs from 'node:fs'
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+
+import type { WorkflowJSON04 } from '@/schemas/comfyWorkflowSchema'
+import { migrateLegacyRerouteNodes } from '@/utils/migration/migrateReroute'
+
+describe('migrateReroute', () => {
+  describe('migrateReroute snapshots', () => {
+    // Helper function to load workflow JSON files
+    const loadWorkflow = (filePath: string): WorkflowJSON04 => {
+      const fullPath = path.resolve(__dirname, filePath)
+      const fileContent = fs.readFileSync(fullPath, 'utf-8')
+      return JSON.parse(fileContent) as WorkflowJSON04
+    }
+
+    it.each(['branching.json', 'single_connected.json'])(
+      'should correctly migrate %s',
+      (fileName) => {
+        // Load the legacy workflow
+        const legacyWorkflow = loadWorkflow(
+          `workflows/reroute/legacy/${fileName}`
+        )
+
+        // Migrate the workflow
+        const migratedWorkflow = migrateLegacyRerouteNodes(legacyWorkflow)
+
+        // Compare with snapshot
+        expect(JSON.stringify(migratedWorkflow, null, 2)).toMatchFileSnapshot(
+          `workflows/reroute/native/${fileName}`
+        )
+      }
+    )
+  })
+})