test: add jest-dom matchers and eslint plugin

.eslintrc.json

@@ -21,6 +21,7 @@
     "react-hooks",
     "import",
     "@vitest",
+    "jest-dom",
     "testing-library",
     "eslint-plugin-react-compiler"
   ],
@@ -107,6 +108,7 @@
   "overrides": [
     {
       "extends": [
+        "plugin:jest-dom/recommended",
         "plugin:testing-library/react",
         "plugin:@vitest/legacy-recommended"
       ],

package.json

@@ -111,6 +111,7 @@
     "@rollup/plugin-node-resolve": "^15.3.0",
     "@rollup/plugin-replace": "^6.0.1",
     "@rollup/plugin-typescript": "^12.1.1",
+    "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.0.1",
     "@types/jsdom": "^21.1.7",
     "@types/react": "^18.3.12",
@@ -125,6 +126,7 @@
     "eslint-config-prettier": "^9.1.0",
     "eslint-import-resolver-alias": "^1.1.2",
     "eslint-plugin-import": "^2.31.0",
+    "eslint-plugin-jest-dom": "^5.4.0",
     "eslint-plugin-prettier": "^5.2.1",
     "eslint-plugin-react": "^7.37.2",
     "eslint-plugin-react-compiler": "19.0.0-beta-8a03594-20241020",

tests/proxySet.test.tsx

@@ -649,7 +649,7 @@ describe('ui updates - useSnapshot', async () => {
 
     fireEvent.click(screen.getByText('Add Item'))
 
-    expect(await screen.findByText('1')).toBeDefined()
+    expect(await screen.findByText('1')).toBeInTheDocument()
   })
 
   it('should be reactive to changes when using keys method', async () => {
@@ -682,7 +682,7 @@ describe('ui updates - useSnapshot', async () => {
     )
 
     fireEvent.click(screen.getByText('Add Item'))
-    expect(await screen.findByText('item key: 1')).toBeDefined()
+    expect(await screen.findByText('item key: 1')).toBeInTheDocument()
   })
 
   it('should be reactive to changes when using entries method', async () => {
@@ -715,7 +715,7 @@ describe('ui updates - useSnapshot', async () => {
     )
 
     fireEvent.click(screen.getByText('Add Item'))
-    expect(await screen.findByText('key: 1; value: 1')).toBeDefined()
+    expect(await screen.findByText('key: 1; value: 1')).toBeInTheDocument()
   })
 })
 

tests/setup.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom/vitest'

vitest.config.ts

@@ -14,6 +14,7 @@ export default defineConfig({
     // Keeping globals to true triggers React Testing Library's auto cleanup
     // https://vitest.dev/guide/migration.html
     globals: true,
+    setupFiles: ['tests/setup.ts'],
     coverage: {
       include: ['src/**/'],
       reporter: ['text', 'json', 'html', 'text-summary'],