Correct plugin file in bootstrap when scaffolding plugin test

src/Scaffold_Command.php

@@ -869,9 +869,29 @@ private function scaffold_plugin_theme_tests( $args, $assoc_args, $type ) {
 		$wp_versions_to_test[] = 'latest';
 		$wp_versions_to_test[] = 'trunk';
 
+		$main_file = '';
+
+		if ( 'plugin' === $type ) {
+			$all_plugins = get_plugins();
+
+			if ( ! empty( $all_plugins ) ) {
+				$filtered = array_filter(
+					array_keys( $all_plugins ),
+					static function ( $item ) use ( $slug ) {
+						return ( false !== strpos( $item, "{$slug}/" ) );
+					}
+				);
+
+				if ( ! empty( $filtered ) ) {
+					$main_file = basename( reset( $filtered ) );
+				}
+			}
+		}
+
 		$template_data = [
-			"{$type}_slug"    => $slug,
-			"{$type}_package" => $package,
+			"{$type}_slug"      => $slug,
+			"{$type}_package"   => $package,
+			"{$type}_main_file" => $main_file,
 		];
 
 		$force           = Utils\get_flag_value( $assoc_args, 'force' );

templates/plugin-bootstrap.mustache

@@ -29,7 +29,7 @@ require_once "{$_tests_dir}/includes/functions.php";
  * Manually load the plugin being tested.
  */
 function _manually_load_plugin() {
-	require dirname( dirname( __FILE__ ) ) . '/{{plugin_slug}}.php';
+	require dirname( dirname( __FILE__ ) ) . '/{{plugin_main_file}}';
 }
 
 tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );