Prevent double-zip generation

_tests/QITSelfTests.php

@@ -445,11 +445,19 @@ class $name extends QITE2ETestCase {
 }
 
 function generate_zips( array $test_type_test_runs ) {
-	$zip_processes = [];
+	$zip_processes  = [];
+	$generated_zips = [];
 	foreach ( $test_type_test_runs as $t ) {
 		$path = $t['path'];
 		$slug = Context::$sut_slug;
 
+		$generated_zips[] = md5( $path . $slug );
+
+		if ( in_array( md5( $path . $slug ), $generated_zips ) ) {
+			echo "[INFO] Skipping zip generation for test: {$t['test_function_name']} (Another test in same dir already zipped)\n";
+			continue;
+		}
+
 		if ( getenv( 'CI' ) ) {
 			// In CI environment, execute the zipping command directly to avoid downloading the zip docker image.
 			$args = [