duplicate registry IDs test

Author: TabulateJarl8

src/core/__tests__/registry.spec.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { PluginLoader } from '../loader'
+
+describe('Plugin Registry', () => {
+  it('check that plugins do not override each other', async () => {
+    const loader = new PluginLoader()
+
+    const registered = new Set<string>()
+    const duplicate: string[] = []
+
+    const pluginsMap = loader['plugins'] as Map<string, unknown>
+
+    const originalSet = pluginsMap.set.bind(pluginsMap)
+
+    const setSpy = vi.spyOn(pluginsMap, 'set').mockImplementation((key, value) => {
+      if (registered.has(key)) {
+        duplicate.push(key)
+      }
+      registered.add(key)
+      return originalSet(key, value)
+    })
+
+    try {
+      await loader.loadPlugins(true)
+
+      expect(duplicate).toEqual([])
+    } finally {
+      setSpy.mockRestore()
+    }
+  })
+})