4196 integration tests with cypress (#4206)

* - update gitignore
- add cypress configuration and example test

* add integration tests to ci workflow

* add note about running integration tests

* Update docs/general/contributing.md

Co-authored-by: Tim Buckley <timothypbuckley@gmail.com>

* Update .gitignore

Co-authored-by: Tim Buckley <timothypbuckley@gmail.com>

* Update cypress.json

Co-authored-by: Tim Buckley <timothypbuckley@gmail.com>

* add baseUrl, remove goTo command

Co-authored-by: Tim Buckley <timothypbuckley@gmail.com>

package.json

@@ -30,7 +30,10 @@
     "test": "mocha --require ./config/babel/register.cjs ./packages/*/test/index.js",
     "test:custom": "mocha --require ./config/babel/register.cjs ./packages/slate/test/index.js",
     "test:inspect": "yarn test --inspect-brk",
-    "watch": "yarn build:rollup --watch"
+    "test:integration": "run-p -r serve cypress:run",
+    "watch": "yarn build:rollup --watch",
+    "cypress:run": "cypress run",
+    "cypress:open": "cypress open"
   },
   "devDependencies": {
     "@babel/cli": "^7.7.4",
@@ -48,6 +51,7 @@
     "@babel/runtime": "^7.7.4",
     "@changesets/changelog-github": "^0.3.0",
     "@changesets/cli": "^2.14.1",
+    "@testing-library/cypress": "^7.0.5",
     "@types/lodash": "^4.14.149",
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.12.14",
@@ -59,6 +63,7 @@
     "babel-plugin-dev-expression": "^0.2.2",
     "babel-plugin-module-resolver": "^3.1.1",
     "cross-env": "6.0.3",
+    "cypress": "^7.1.0",
     "emotion": "^10.0.9",
     "eslint": "^6.7.1",
     "eslint-config-prettier": "^6.7.0",