1 files changed, 50 insertions, 0 deletions
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 ) }` );
+	} );
+}