test: run unit tests on warpdom instead of jsdom

jest.config.js

@@ -1,6 +1,7 @@
 const jestConfig = require('kcd-scripts/jest')
 
 module.exports = Object.assign(jestConfig, {
+  testEnvironment: 'warpdom',
   coveragePathIgnorePatterns: [
     ...jestConfig.coveragePathIgnorePatterns,
     '.macro.js$',

other/misc-tests/jest.config.js

@@ -3,7 +3,7 @@ const babelHelpersList = require('@babel/helpers').list
 
 module.exports = Object.assign(jestConfig, {
   roots: ['.'],
-  testEnvironment: 'jsdom',
+  testEnvironment: 'warpdom',
   transform: {
     '^.+\\.(js|jsx|mjs)$': ['babel-jest', {rootMode: 'upward'}],
   },

other/ssr/jest.config.js

@@ -1,6 +1,6 @@
 // This is separate because the test environment is set via the config
-// and we want most of our tests to run with jsdom, but we still want
-// to make sure that the server rendering use case continues to work.
+// and we want most of our tests to run with a DOM (warpdom), but we still
+// want to make sure that the server rendering use case continues to work.
 const jestConfig = require('kcd-scripts/config').jest
 
 module.exports = Object.assign(jestConfig, {

package.json

@@ -126,6 +126,7 @@
     "flow-bin": "^0.299.0",
     "flow-coverage-report": "^0.8.0",
     "get-pkg-repo": "5.0.0",
+    "jest-environment-warpdom": "^0.1.0",
     "kcd-scripts": "^17.0.0",
     "node-polyfill-webpack-plugin": "^4.1.0",
     "npm-run-all": "^4.1.5",
@@ -139,7 +140,8 @@
     "react-test-renderer": "^18.3.1",
     "serve": "^14.2.5",
     "start-server-and-test": "^2.1.3",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "warpdom": "^0.1.3"
   },
   "overrides": {
     "eslint-plugin-react-hooks": "^7.1.1"