chore(tests): add SlickGrid grid events tests (#1321)

* chore(tests): add SlickGrid grid events tests

README.md

@@ -53,7 +53,7 @@ The GitHub [live demo](https://ghiscoding.github.io/slickgrid-universal) shows 2
 The Slickgrid-Universal [live demo](https://ghiscoding.github.io/slickgrid-universal) is a Vanilla Implementation (which is not associated to any framework) built with [ViteJS](https://vitejs.dev/) (originally [WebPack](https://webpack.js.org/)) and is also used to run the E2E tests with [Cypress](https://www.cypress.io/) for testing all UI functionalities. The [Vanilla-force-bundle](https://github.com/ghiscoding/slickgrid-universal/tree/master/packages/vanilla-force-bundle), which extends the [vanilla-bundle](https://github.com/ghiscoding/slickgrid-universal/tree/master/packages/vanilla-bundle) package is also what we use in our SalesForce implementation (with Lightning Web Component), which was the original reason to create this monorepo library and avoid code duplication.
 
 ### Fully Tested with [Jest](https://jestjs.io/) (Unit Tests) - [Cypress](https://www.cypress.io/) (E2E Tests)
-Slickgrid-Universal has close to **100%** Unit Test Coverage, about +4,500 Jest unit tests and also +550 Cypress E2E tests to cover all [Examples](https://ghiscoding.github.io/slickgrid-universal/) and most UI functionalities (each framework implementation also have an additional 600 tests), the goal is to test everything and offer peace of mind that all the code and PR changes are fully tested and that we have tests to cover them.
+Slickgrid-Universal has close to **100%** Unit Test Coverage, almost 5,000 Jest unit tests and also +550 Cypress E2E tests to cover all [Examples](https://ghiscoding.github.io/slickgrid-universal/) and most UI functionalities (each framework implementation also have an additional 600 tests), the goal is to test everything and offer peace of mind that all the code and PR changes are fully tested and that we have tests to cover them.
 
 ### Available Public Packages