I tried to perform a test on the WC_VERSION constant.

The main class :

class WC_Custom_Variable_Products_Dependencies {

    /** minimum WooCommerce version required by this plugin */
    const MINIMUM_WC_VERSION = '3.7.9';

    public function __construct() {

        add_action( 'admin_init', [$this, 'check_wc_version']);

    protected function check_wc_version() {

         return  version_compare(WC_VERSION, self::MINIMUM_WC_VERSION , '>=');

The test class :

 require_once 'includes/class-wc-custom-variable-products-dependencies.php';

 class WC_Custom_Variable_Products_DependenciesTest extends WP_UnitTestCase {

     public function setUp() {
        $this->class_instance = new WC_Custom_Variable_Products_Dependencies();

     * Tests the protected functions 
     * @param Object $method
     * @return bool
    private function makeReflection($method) {

        $reflection = new ReflectionClass('WC_Custom_Variable_Products_Dependencies');
        $protectedMethod = $reflection->getMethod($method);

        return $protectedMethod->invokeArgs($this->class_instance, ['']);
    public function test_check_wc_version() {

        $result = $this->makeReflection('check_wc_version');

And PHPunit return : Use of undefined constant WC_VERSION - assumed 'WC_VERSION' does this mean in the test, Woocommerce is not loaded?

1 Answer 1


return defined('WC_VERSION'); should fix since defined() accepts a string as parameter. https://www.php.net/manual/en/function.defined.php

If you use: require_once($_SERVER['DOCUMENT_ROOT'].'/wp-load.php'); adjusting your path if the installation is in a subrdir you load all the WP environment including active plugins etc

  • yes i corrected that but now i have Failed asserting that false is true. means woocommerce is not active ?
    – Younes.D
    Jan 13, 2020 at 9:09
  • I think you should post a more detailed code, these are just pieces Jan 13, 2020 at 9:37
  • finally, I fixed the issue. simply load woocommerce sripts: require_once '../woocommerce/woocommerce.php'; . it 's a good practice or not ?
    – Younes.D
    Jan 13, 2020 at 10:29
  • require_once($_SERVER['DOCUMENT_ROOT'].'/wp-load.php'); adjust your path if the installation is in a subrdir. In this way you load all the WP environment Jan 13, 2020 at 10:41

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