Remove debugging

src/wp-admin/includes/file.php

@@ -144,31 +144,25 @@ function list_files( $folder = '', $levels = 100, $exclusions = array() ) {
 	if ( $dir ) {
 		while ( ( $file = readdir( $dir ) ) !== false ) {
 			// Skip current and parent folder links.
-			var_dump( $dir, $file );
 			if ( in_array( $file, array( '.', '..' ), true ) ) {
 				continue;
 			}
-			echo 1;
 
 			// Skip hidden and excluded files.
 			if ( '.' === $file[0] || in_array( $file, $exclusions, true ) ) {
 				continue;
 			}
-			echo 2;
 
 			if ( is_dir( $folder . $file ) ) {
-				echo 3;
 				$files2 = list_files( $folder . $file, $levels - 1 );
 				if ( $files2 ) {
 					$files = array_merge($files, $files2 );
 				} else {
 					$files[] = $folder . $file . '/';
 				}
 			} else {
-				echo 4;
 				$files[] = $folder . $file;
 			}
-			var_dump( $files );
 		}
 	}
 	@closedir( $dir );

tests/phpunit/tests/admin/includesPlugin.php

@@ -110,7 +110,7 @@ public function test_get_plugin_files_folder() {
 			'list_files_test_plugin/list_files_test_plugin.php',
 			'list_files_test_plugin/subdir/subfile.php',
 		);
-		$this->assertEquals( $expected, $plugin_files );
+		$this->assertEqualSets( $expected, $plugin_files );
 
 		unlink( $sub_dir . '/subfile.php' );
 		unlink( $plugin[1] );