Add Enqueued Resources check

includes/Checker/Checks/Enqueued_Resources_Check.php

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+<?php
+/**
+ * Class WordPress\Plugin_Check\Checker\Checks\Enqueued_Resources_Check
+ *
+ * @package plugin-check
+ */
+
+namespace WordPress\Plugin_Check\Checker\Checks;
+
+use WordPress\Plugin_Check\Checker\Check_Categories;
+use WordPress\Plugin_Check\Traits\Stable_Check;
+
+/**
+ * Check for running WordPress enqueued resources sniffs.
+ *
+ * @since n.e.x.t
+ */
+class Enqueued_Resources_Check extends Abstract_PHP_CodeSniffer_Check {
+
+	use Stable_Check;
+
+	/**
+	 * Gets the categories for the check.
+	 *
+	 * Every check must have at least one category.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return array The categories for the check.
+	 */
+	public function get_categories() {
+		return array( Check_Categories::CATEGORY_PERFORMANCE );
+	}
+
+	/**
+	 * Returns an associative array of arguments to pass to PHPCS.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @return array An associative array of PHPCS CLI arguments.
+	 */
+	protected function get_args() {
+		return array(
+			'extensions' => 'php',
+			'standard'   => 'WordPress',
+			'sniffs'     => 'WordPress.WP.EnqueuedResources',
+		);
+	}
+}

tests/phpunit/testdata/plugins/test-plugin-enqueued-resources-with-errors/load.php

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+<?php
+/**
+ * Plugin Name: Test Plugin Enqueued Resources check with errors
+ * Plugin URI: https://github.com/wordpress/plugin-check
+ * Description: Test plugin for the Enqueued Resources check.
+ * Requires at least: 6.0
+ * Requires PHP: 5.6
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-enqueued-resources-with-errors
+ *
+ * @package test-plugin-enqueued-resources-with-errors
+ */
+
+?>
+<link rel="stylesheet" href="http://someurl/somefile.css">
+<script src="http://someurl/somefile.js"></script>

tests/phpunit/testdata/plugins/test-plugin-enqueued-resources-without-errors/load.php

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+<?php
+/**
+ * Plugin Name: Test Plugin Enqueued Resources check without errors
+ * Plugin URI: https://github.com/wordpress/plugin-check
+ * Description: Test plugin for the Enqueued Resources check.
+ * Requires at least: 6.0
+ * Requires PHP: 5.6
+ * Version: 1.0.0
+ * Author: WordPress Performance Team
+ * Author URI: https://make.wordpress.org/performance/
+ * License: GPLv2 or later
+ * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * Text Domain: test-plugin-enqueued-resources-without-errors
+ *
+ * @package test-plugin-enqueued-resources-without-errors
+ */
+
+add_action(
+	'wp_enqueue_scripts',
+	function() {
+		wp_enqueue_script(
+			'plugin_check_script',
+			'http://someurl/somefile.js'
+		);
+		wp_enqueue_style(
+			'plugin_check_style',
+			'http://someurl/somefile.css'
+		);
+	}
+);

tests/phpunit/tests/Checker/Checks/Enqueued_Resources_Check_Tests.php

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+<?php
+/**
+ * Tests for the Enqueued_Resources_Check class.
+ *
+ * @package plugin-check
+ */
+
+use WordPress\Plugin_Check\Checker\Check_Context;
+use WordPress\Plugin_Check\Checker\Check_Result;
+use WordPress\Plugin_Check\Checker\Checks\Enqueued_Resources_Check;
+
+class Enqueued_Resources_Check_Tests extends WP_UnitTestCase {
+
+	public function test_run_with_errors() {
+		$check         = new Enqueued_Resources_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-enqueued-resources-with-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors = $check_result->get_errors();
+
+		$this->assertNotEmpty( $errors );
+		$this->assertArrayHasKey( 'load.php', $errors );
+		$this->assertEquals( 2, $check_result->get_error_count() );
+	}
+
+	public function test_run_without_errors() {
+		$check         = new Enqueued_Resources_Check();
+		$check_context = new Check_Context( UNIT_TESTS_PLUGIN_DIR . 'test-plugin-enqueued-resources-without-errors/load.php' );
+		$check_result  = new Check_Result( $check_context );
+
+		$check->run( $check_result );
+
+		$errors = $check_result->get_errors();
+
+		$this->assertEmpty( $errors );
+		$this->assertEquals( 0, $check_result->get_error_count() );
+	}
+}