Bump ava from 0.25.0 to 2.4.0 (#3869)

* Bump ava from 0.25.0 to 2.4.0

Bumps [ava](https://github.com/avajs/ava) from 0.25.0 to 2.4.0.
- [Release notes](https://github.com/avajs/ava/releases)
- [Commits](https://github.com/avajs/ava/compare/v0.25.0...v2.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* adapt new ava format

* only run unit tests in ci as before


Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Benjamin Staneck <staneck@gmail.com>

package.json

@@ -9,7 +9,7 @@
     "build": "cross-env NODE_ENV=production webpack && tsc",
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
     "test": "yarn run lint && yarn run test:unit",
-    "test:unit": "ava test/unit",
+    "test:unit": "ava",
     "test:unit:watch": "yarn run test:unit -- --watch",
     "prepush": "yarn test",
     "postinstall": "webpack --config-name hyper-app && electron-builder install-app-deps && yarn run rebuild-node-pty && cpy --cwd=target --parents 'node_modules/**/*' '../app/'",
@@ -17,6 +17,14 @@
     "dist": "yarn run build && cross-env BABEL_ENV=production babel --out-file target/renderer/bundle.js --no-comments --minified target/renderer/bundle.js && electron-builder",
     "clean": "node ./bin/rimraf-standalone.js node_modules && node ./bin/rimraf-standalone.js ./app/node_modules && node ./bin/rimraf-standalone.js ./app/renderer"
   },
+  "ava": {
+    "files": [
+      "test/unit/*"
+    ],
+    "helpers": [
+      "**/testUtils/**/*"
+    ]
+  },
   "eslintConfig": {
     "plugins": [
       "react",
@@ -289,7 +297,7 @@
     "@types/uuid": "3.4.5",
     "@typescript-eslint/eslint-plugin": "2.4.0",
     "@typescript-eslint/parser": "2.4.0",
-    "ava": "0.25.0",
+    "ava": "2.4.0",
     "babel-loader": "8.0.6",
     "babel-preset-minify": "0.5.1",
     "concurrently": "5.0.0",