diff --git a/tests/2.3/TestCase.php b/tests/2.3/TestCase.php
new file mode 100644
index 0000000..06cc76f
--- /dev/null
+++ b/tests/2.3/TestCase.php
@@ -0,0 +1,5 @@
+<?php
+
+class TestCase extends OpenCartTest
+{
+}
diff --git a/tests/3.0/TestCase.php b/tests/3.0/TestCase.php
new file mode 100644
index 0000000..c7053b7
--- /dev/null
+++ b/tests/3.0/TestCase.php
@@ -0,0 +1,5 @@
+<?php
+
+class TestCase extends \Tests\OpenCartTest
+{
+}
diff --git a/tests/admin/ControllerRetailcrmAdminTest.php b/tests/admin/ControllerRetailcrmAdminTest.php
index bc8dd01..7287b2e 100644
--- a/tests/admin/ControllerRetailcrmAdminTest.php
+++ b/tests/admin/ControllerRetailcrmAdminTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ControllerRetailcrmAdminTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ControllerRetailcrmAdminTest extends TestCase
 {
     const MODULE_TITLE = 'retailcrm';
 
diff --git a/tests/admin/ModelRetailcrmCustomerAdminTest.php b/tests/admin/ModelRetailcrmCustomerAdminTest.php
index 80bf169..a35d462 100644
--- a/tests/admin/ModelRetailcrmCustomerAdminTest.php
+++ b/tests/admin/ModelRetailcrmCustomerAdminTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmCustomerAdminTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmCustomerAdminTest extends TestCase
 {
     private $customerModel;
     private $apiClientMock;
diff --git a/tests/admin/ModelRetailcrmEventAdminTest.php b/tests/admin/ModelRetailcrmEventAdminTest.php
index ba1f05a..f48efb9 100644
--- a/tests/admin/ModelRetailcrmEventAdminTest.php
+++ b/tests/admin/ModelRetailcrmEventAdminTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmEventAdminTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmEventAdminTest extends TestCase
 {
     const CODE = 'test';
 
diff --git a/tests/admin/ModelRetailcrmOrderAdminTest.php b/tests/admin/ModelRetailcrmOrderAdminTest.php
index 6603d92..750bfa7 100644
--- a/tests/admin/ModelRetailcrmOrderAdminTest.php
+++ b/tests/admin/ModelRetailcrmOrderAdminTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmOrderAdminTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmOrderAdminTest extends TestCase
 {
     private $orderModel;
     private $apiClientMock;
diff --git a/tests/admin/ModelRetailcrmPricesAdminTest.php b/tests/admin/ModelRetailcrmPricesAdminTest.php
index 78454aa..9284983 100644
--- a/tests/admin/ModelRetailcrmPricesAdminTest.php
+++ b/tests/admin/ModelRetailcrmPricesAdminTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmPricesAdminTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmPricesAdminTest extends TestCase
 {
     private $pricesModel;
     private $apiClientMock;
diff --git a/tests/catalog/ControllerRetailcrmApiCatalogTest.php b/tests/catalog/ControllerRetailcrmApiCatalogTest.php
index 6afaff5..2f54db3 100644
--- a/tests/catalog/ControllerRetailcrmApiCatalogTest.php
+++ b/tests/catalog/ControllerRetailcrmApiCatalogTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ControllerRetailcrmApiCatalogTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ControllerRetailcrmApiCatalogTest extends TestCase
 {
     private $apiKey;
     private $retailcrm;
diff --git a/tests/catalog/ModelRetailcrmCustomerCatalogTest.php b/tests/catalog/ModelRetailcrmCustomerCatalogTest.php
index 9101a0a..badcbc7 100644
--- a/tests/catalog/ModelRetailcrmCustomerCatalogTest.php
+++ b/tests/catalog/ModelRetailcrmCustomerCatalogTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmCustomerCatalogTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmCustomerCatalogTest extends TestCase
 {
     private $customerModel;
     private $apiClientMock;
diff --git a/tests/catalog/ModelRetailcrmOrderCatalogTest.php b/tests/catalog/ModelRetailcrmOrderCatalogTest.php
index 4c72025..0d7ae99 100644
--- a/tests/catalog/ModelRetailcrmOrderCatalogTest.php
+++ b/tests/catalog/ModelRetailcrmOrderCatalogTest.php
@@ -1,6 +1,8 @@
 <?php
 
-class ModelRetailcrmOrderCatalogTest extends OpenCartTest
+require_once __DIR__ . '/../' . getenv('OPENCART') . '/TestCase.php';
+
+class ModelRetailcrmOrderCatalogTest extends TestCase
 {
     private $orderModel;
     private $apiClientMock;