Tests: Run tests in Edge in IE mode in GitHub Actions

While Edge in IE mode is not guaranteed to match IE 11 in every aspect,
in practice it generally does. Testing in this mode in GitHub Actions
will allow us to catch most IE-breaking issues at the PR level.

This change also adds missing npm scripts: `test:chrome`, `test:edge`
& `test:ie`.

Closes gh-5540

1 files changed, 16 insertions, 3 deletions

diff --git a/test/runner/selenium/createDriver.js b/test/runner/selenium/createDriver.js
index 095c12214..df1204763 100644
--- a/test/runner/selenium/createDriver.js
+++ b/test/runner/selenium/createDriver.js
@@ -2,6 +2,7 @@ import { Builder, Capabilities, logging } from "selenium-webdriver";
 import Chrome from "selenium-webdriver/chrome.js";
 import Edge from "selenium-webdriver/edge.js";
 import Firefox from "selenium-webdriver/firefox.js";
+import IE from "selenium-webdriver/ie.js";
 import { browserSupportsHeadless } from "../lib/getBrowserString.js";
 
 // Set script timeout to 10min
@@ -9,9 +10,16 @@ const DRIVER_SCRIPT_TIMEOUT = 1000 * 60 * 10;
 
 export default async function createDriver( { browserName, headless, url, verbose } ) {
 	const capabilities = Capabilities[ browserName ]();
-	const prefs = new logging.Preferences();
-	prefs.setLevel( logging.Type.BROWSER, logging.Level.ALL );
-	capabilities.setLoggingPrefs( prefs );
+
+	// Support: IE 11+
+	// When those are set for IE, the process crashes with an error:
+	// "Unable to match capability set 0: goog:loggingPrefs is an unknown
+	// extension capability for IE".
+	if ( browserName !== "ie" ) {
+		const prefs = new logging.Preferences();
+		prefs.setLevel( logging.Type.BROWSER, logging.Level.ALL );
+		capabilities.setLoggingPrefs( prefs );
+	}
 
 	let driver = new Builder().withCapabilities( capabilities );
 
@@ -49,6 +57,10 @@ export default async function createDriver( { browserName, headless, url, verbos
 		edgeOptions.setEdgeChromiumBinaryPath( process.env.EDGE_BIN );
 	}
 
+	const ieOptions = new IE.Options();
+	ieOptions.setEdgeChromium( true );
+	ieOptions.setEdgePath( "C:/Program Files (x86)/Microsoft/Edge/Application/msedge.exe" );
+
 	if ( headless ) {
 		chromeOptions.addArguments( "--headless=new" );
 		firefoxOptions.addArguments( "--headless" );
@@ -65,6 +77,7 @@ export default async function createDriver( { browserName, headless, url, verbos
 		.setChromeOptions( chromeOptions )
 		.setFirefoxOptions( firefoxOptions )
 		.setEdgeOptions( edgeOptions )
+		.setIeOptions( ieOptions )
 		.build();
 
 	if ( verbose ) {