[macOS] Upgrade Selenium server version from 3 to 4 (#4474)

* upgrade selenium version from 3 to 4
* add test

images/macos/provision/core/chrome.sh

@@ -7,12 +7,8 @@ brew_cask_install_ignoring_sha256 "google-chrome"
 echo "Installing Chrome Driver"
 brew install --cask chromedriver
 
-# Temporarily download Selenium 3.141.59, since 4.* can contain some breaking changes
 echo "Installing Selenium"
-cd $(brew --repo homebrew/core)
-git checkout dc37198
-brew_smart_install "selenium-server-standalone"
-git checkout master
+brew_smart_install "selenium-server"
 
 CHROMEWEBDRIVER_DIR=$(readlink $(which chromedriver) | xargs dirname)
 echo "export CHROMEWEBDRIVER=$CHROMEWEBDRIVER_DIR" >> "${HOME}/.bashrc"

images/macos/tests/Browsers.Tests.ps1

@@ -10,6 +10,12 @@ Describe "Chrome" {
     }
 }
 
+Describe "Selenium server" {
+    It "Selenium server" {
+        (Get-ChildItem -Path "/usr/local/Cellar/selenium-server*/*").Name | Should -BeLike "4.*"
+    }
+}
+
 Describe "Edge" {
     It "Microsoft Edge" {
         $edgeLocation = "/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge"