diff --git a/includes/class-woocommerce.php b/includes/class-woocommerce.php
index 0e4b7ded1b2..2e14dda15f8 100644
--- a/includes/class-woocommerce.php
+++ b/includes/class-woocommerce.php
@@ -220,8 +220,6 @@ final class WooCommerce {
 	/**
 	 * Define constant if not already set.
 	 *
-	 * For integrations prefer wc_maybe_define_constant() instead.
-	 *
 	 * @param string      $name  Constant name.
 	 * @param string|bool $value Constant value.
 	 */
diff --git a/tests/unit-tests/core/functions.php b/tests/unit-tests/core/functions.php
index 7e80ff61ab9..ec72cf42ea8 100644
--- a/tests/unit-tests/core/functions.php
+++ b/tests/unit-tests/core/functions.php
@@ -1,4 +1,4 @@
-<<?php
+<?php
 
 /**
  * Class Functions.
diff --git a/tests/unit-tests/core/main-class.php b/tests/unit-tests/core/main-class.php
index 41f956dabfc..02eab54dc5f 100644
--- a/tests/unit-tests/core/main-class.php
+++ b/tests/unit-tests/core/main-class.php
@@ -68,21 +68,4 @@ class WC_Test_WooCommerce extends WC_Unit_Test_Case {
 		$this->assertInstanceOf( 'WC_Cart', $this->wc->cart );
 		$this->assertInstanceOf( 'WC_Customer', $this->wc->customer );
 	}
-
-	/**
-	 * Test WooCommerce->define.
-	 *
-	 * @since 2.3.0
-	 */
-	public function test_define() {
-		$this->assertFalse( defined( 'WC_TESTING_DEFINE_METHOD' ) );
-
-		// Check if defined.
-		$this->wc->define( 'WC_TESTING_DEFINE_METHOD', true );
-		$this->assertTrue( defined( 'WC_TESTING_DEFINE_METHOD' ) );
-
-		// Check value.
-		$this->wc->define( 'WC_TESTING_DEFINE_METHOD', false );
-		$this->assertTrue( WC_TESTING_DEFINE_METHOD );
-	}
 }