test(query-devtools/TanstackQueryDevtoolsPanel): add 'mount' and 'unmount' lifecycle tests (#10640)

Author: sukvvon

packages/query-devtools/src/__tests__/TanstackQueryDevtoolsPanel.test.tsx

@@ -0,0 +1,59 @@
+import { beforeEach, describe, expect, it } from 'vitest'
+import { QueryClient, onlineManager } from '@tanstack/query-core'
+import { TanstackQueryDevtoolsPanel } from '..'
+
+describe('TanstackQueryDevtoolsPanel', () => {
+  let devtools: TanstackQueryDevtoolsPanel
+
+  beforeEach(() => {
+    devtools = new TanstackQueryDevtoolsPanel({
+      client: new QueryClient(),
+      queryFlavor: 'TanStack Query',
+      version: '5',
+      onlineManager,
+    })
+  })
+
+  describe('mount', () => {
+    it('should mount devtools to the provided element', () => {
+      const el = document.createElement('div')
+
+      expect(() => devtools.mount(el)).not.toThrow()
+
+      devtools.unmount()
+    })
+
+    it('should throw if mount is called twice without unmount', () => {
+      const el = document.createElement('div')
+      devtools.mount(el)
+
+      expect(() => devtools.mount(el)).toThrow('Devtools is already mounted')
+
+      devtools.unmount()
+    })
+  })
+
+  describe('unmount', () => {
+    it('should unmount devtools and allow remounting', () => {
+      const el = document.createElement('div')
+      devtools.mount(el)
+
+      expect(() => devtools.unmount()).not.toThrow()
+      expect(() => devtools.mount(el)).not.toThrow()
+
+      devtools.unmount()
+    })
+
+    it('should throw if unmount is called before mount', () => {
+      expect(() => devtools.unmount()).toThrow('Devtools is not mounted')
+    })
+
+    it('should throw if unmount is called twice', () => {
+      const el = document.createElement('div')
+      devtools.mount(el)
+      devtools.unmount()
+
+      expect(() => devtools.unmount()).toThrow('Devtools is not mounted')
+    })
+  })
+})