4 files changed, 146 insertions, 0 deletions
diff --git a/test/runner/lib/buildTestUrl.js b/test/runner/lib/buildTestUrl.js
new file mode 100644
index 000000000..6e0f1a9b0
--- /dev/null
+++ b/test/runner/lib/buildTestUrl.js
@@ -0,0 +1,29 @@
+import { generateModuleId } from "./generateHash.js";
+
+export function buildTestUrl( modules, { browserstack, esm, jsdom, port, reportId } ) {
+	if ( !port ) {
+		throw new Error( "No port specified." );
+	}
+
+	const query = new URLSearchParams();
+	for ( const module of modules ) {
+		query.append( "moduleId", generateModuleId( module ) );
+	}
+
+	if ( esm ) {
+		query.append( "esmodules", "true" );
+	}
+
+	if ( jsdom ) {
+		query.append( "jsdom", "true" );
+	}
+
+	if ( reportId ) {
+		query.append( "reportId", reportId );
+	}
+
+	// BrowserStack supplies a custom domain for local testing,
+	// which is especially necessary for iOS testing.
+	const host = browserstack ? "bs-local.com" : "localhost";
+	return `http://${ host }:${ port }/test/?${ query }`;
+}
diff --git a/test/runner/lib/generateHash.js b/test/runner/lib/generateHash.js
new file mode 100644
index 000000000..dbbd4b476
--- /dev/null
+++ b/test/runner/lib/generateHash.js
@@ -0,0 +1,50 @@
+import crypto from "node:crypto";
+
+export function generateHash( string ) {
+	const hash = crypto.createHash( "md5" );
+	hash.update( string );
+
+	// QUnit hashes are 8 characters long
+	// We use 10 characters to be more visually distinct
+	return hash.digest( "hex" ).slice( 0, 10 );
+}
+
+/**
+ * A copy of the generate hash function from QUnit,
+ * used to generate a hash for the module name.
+ *
+ * QUnit errors on passing multiple modules to the
+ * module query parameter. We need to know
+ * the hash for each module before loading QUnit
+ * in order to pass multiple moduleId parameters instead.
+ */
+export function generateModuleId( module, browser ) {
+
+	// QUnit normally hashes the test name, but
+	// we've repurposed this function to generate
+	// report IDs for module/browser combinations.
+	// We still use it without the browser parameter
+	// to get the same module IDs as QUnit to pass
+	// multiple ahead-of-time in the query string.
+	const str = module + "\x1C" + browser;
+	let hash = 0;
+
+	for ( let i = 0; i < str.length; i++ ) {
+		hash = ( hash << 5 ) - hash + str.charCodeAt( i );
+		hash |= 0;
+	}
+
+	let hex = ( 0x100000000 + hash ).toString( 16 );
+	if ( hex.length < 8 ) {
+		hex = "0000000" + hex;
+	}
+
+	return hex.slice( -8 );
+}
+
+export function printModuleHashes( modules ) {
+	console.log( "Module hashes:" );
+	modules.forEach( ( module ) => {
+		console.log( `  ${ module }: ${ generateModuleId( module ) }` );
+	} );
+}
diff --git a/test/runner/lib/getBrowserString.js b/test/runner/lib/getBrowserString.js
new file mode 100644
index 000000000..413a60500
--- /dev/null
+++ b/test/runner/lib/getBrowserString.js
@@ -0,0 +1,49 @@
+const browserMap = {
+	chrome: "Chrome",
+	edge: "Edge",
+	firefox: "Firefox",
+	ie: "IE",
+	jsdom: "JSDOM",
+	opera: "Opera",
+	safari: "Safari"
+};
+
+export function browserSupportsHeadless( browser ) {
+	browser = browser.toLowerCase();
+	return (
+		browser === "chrome" ||
+		browser === "firefox" ||
+		browser === "edge"
+	);
+}
+
+export function getBrowserString(
+	{
+		browser,
+		browser_version: browserVersion,
+		device,
+		os,
+		os_version: osVersion
+	},
+	headless
+) {
+	browser = browser.toLowerCase();
+	browser = browserMap[ browser ] || browser;
+	let str = browser;
+	if ( browserVersion ) {
+		str += ` ${ browserVersion }`;
+	}
+	if ( device ) {
+		str += ` for ${ device }`;
+	}
+	if ( os ) {
+		str += ` on ${ os }`;
+	}
+	if ( osVersion ) {
+		str += ` ${ osVersion }`;
+	}
+	if ( headless && browserSupportsHeadless( browser ) ) {
+		str += " (headless)";
+	}
+	return str;
+}
diff --git a/test/runner/lib/prettyMs.js b/test/runner/lib/prettyMs.js
new file mode 100644
index 000000000..99bae2b35
--- /dev/null
+++ b/test/runner/lib/prettyMs.js
@@ -0,0 +1,18 @@
+/**
+ * Pretty print a time in milliseconds.
+ */
+export function prettyMs( time ) {
+	const minutes = Math.floor( time / 60000 );
+	const seconds = Math.floor( time / 1000 );
+	const ms = Math.floor( time % 1000 );
+
+	let prettyTime = `${ ms }ms`;
+	if ( seconds > 0 ) {
+		prettyTime = `${ seconds }s ${ prettyTime }`;
+	}
+	if ( minutes > 0 ) {
+		prettyTime = `${ minutes }m ${ prettyTime }`;
+	}
+
+	return prettyTime;
+}