test: adds types for testing (#435)

package.json

@@ -22,18 +22,19 @@
     "email": "[email protected]"
   },
   "devDependencies": {
+    "@types/jest": "^24.0.18",
     "all-contributors-cli": "^6.7.0",
     "commitizen": "^3.1.1",
     "cz-conventional-changelog": "2.1.0",
     "eslint": "^6.1.0",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-prettier": "^3.1.0",
-    "prettier": "1.18.2",
-    "prettier-package-json": "^2.1.0",
     "jest": "^24.8.0",
     "lerna": "^3.15.0",
     "lint-staged": "^9.2.0",
+    "prettier": "1.18.2",
+    "prettier-package-json": "^2.1.0",
     "supertest": "^4.0.2"
   },
   "config": {

yarn.lock

@@ -1806,6 +1806,18 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
+"@types/jest-diff@*":
+  version "20.0.1"
+  resolved "https://registry.yarnpkg.com/@types/jest-diff/-/jest-diff-20.0.1.tgz#35cc15b9c4f30a18ef21852e255fdb02f6d59b89"
+  integrity sha512-yALhelO3i0hqZwhjtcr6dYyaLoCHbAMshwtj6cGxTvHZAKXHsYGdff6E8EPw3xLKY0ELUTQ69Q1rQiJENnccMA==
+
+"@types/jest@^24.0.18":
+  version "24.0.18"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-24.0.18.tgz#9c7858d450c59e2164a8a9df0905fc5091944498"
+  integrity sha512-jcDDXdjTcrQzdN06+TSVsPPqxvsZA/5QkYfIZlq1JMw7FdP5AZylbOc+6B/cuDurctRe+MziUMtQ3xQdrbjqyQ==
+  dependencies:
+    "@types/jest-diff" "*"
+
 "@types/json-schema@^7.0.3":
   version "7.0.3"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.3.tgz#bdfd69d61e464dcc81b25159c270d75a73c1a636"