diff --git a/tests/customer/woocommerce/test-wc-retailcrm-customer-switcher-state.php b/tests/customer/woocommerce/test-wc-retailcrm-customer-switcher-state.php
index 43a1919..d9bda61 100644
--- a/tests/customer/woocommerce/test-wc-retailcrm-customer-switcher-state.php
+++ b/tests/customer/woocommerce/test-wc-retailcrm-customer-switcher-state.php
@@ -46,14 +46,14 @@ class WC_Retailcrm_Customer_Switcher_State_Test extends WC_Retailcrm_Test_Case_H
 
     public function test_validate_empty()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         $state = new WC_Retailcrm_Customer_Switcher_State();
         $state->validate();
     }
 
     public function test_validate_order()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         $state = new WC_Retailcrm_Customer_Switcher_State();
         $state->setWcOrder(new WC_Order())
             ->validate();
@@ -61,7 +61,7 @@ class WC_Retailcrm_Customer_Switcher_State_Test extends WC_Retailcrm_Test_Case_H
 
     public function test_validate_customer_and_contact_set()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         $state = new WC_Retailcrm_Customer_Switcher_State();
         $state->setWcOrder(new WC_Order())
             ->setNewCustomer(array('id' => 1))
diff --git a/tests/customer/woocommerce/test-wc-retailcrm-wc-customer-builder.php b/tests/customer/woocommerce/test-wc-retailcrm-wc-customer-builder.php
index b2a9d74..4aa2181 100644
--- a/tests/customer/woocommerce/test-wc-retailcrm-wc-customer-builder.php
+++ b/tests/customer/woocommerce/test-wc-retailcrm-wc-customer-builder.php
@@ -13,21 +13,21 @@ class WC_Retailcrm_WC_Customer_Builder_Test extends WC_Retailcrm_Test_Case_Helpe
 {
     public function test_empty()
     {
-        $this->expectException(RuntimeException::class);
+        $this->expectException('\RuntimeException');
         $builder = new WC_Retailcrm_WC_Customer_Builder();
         $builder->build();
     }
 
     public function test_empty_array()
     {
-        $this->expectException(RuntimeException::class);
+        $this->expectException('\RuntimeException');
         $builder = new WC_Retailcrm_WC_Customer_Builder();
         $builder->setData(array())->build();
     }
 
     public function test_not_array()
     {
-        $this->expectException(RuntimeException::class);
+        $this->expectException('\RuntimeException');
         $builder = new WC_Retailcrm_WC_Customer_Builder();
         $builder->setData(new stdClass())->build();
     }
@@ -42,7 +42,7 @@ class WC_Retailcrm_WC_Customer_Builder_Test extends WC_Retailcrm_Test_Case_Helpe
         $builder = new WC_Retailcrm_WC_Customer_Builder();
         $wcCustomer = $builder->setData($customerData)->build()->getResult();
 
-        $this->assertInstanceOf(WC_Customer::class, $wcCustomer);
+        $this->assertInstanceOf('\WC_Customer', $wcCustomer);
 
         if (isset($customerData['firstName'])) {
             $this->assertEquals($customerData['firstName'], $wcCustomer->get_first_name());
diff --git a/tests/models/test-wc-retailcrm-customer-switcher-result.php b/tests/models/test-wc-retailcrm-customer-switcher-result.php
index eb446b6..0eb0e7e 100644
--- a/tests/models/test-wc-retailcrm-customer-switcher-result.php
+++ b/tests/models/test-wc-retailcrm-customer-switcher-result.php
@@ -13,33 +13,33 @@ class WC_Retailcrm_Customer_Switcher_Result_Test extends WC_Retailcrm_Test_Case_
 {
     public function test_invalid_both()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         new WC_Retailcrm_Customer_Switcher_Result(new stdClass(), new stdClass());
     }
 
     public function test_invalid_customer()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         new WC_Retailcrm_Customer_Switcher_Result(new stdClass(), new WC_Order());
     }
 
     public function test_invalid_order()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException('\InvalidArgumentException');
         new WC_Retailcrm_Customer_Switcher_Result(new WC_Customer(), new stdClass());
     }
 
     public function test_valid()
     {
         $result = new WC_Retailcrm_Customer_Switcher_Result(new WC_Customer(), new WC_Order());
-        $this->assertInstanceOf(WC_Customer::class, $result->getWcCustomer());
-        $this->assertInstanceOf(WC_Order::class, $result->getWcOrder());
+        $this->assertInstanceOf('\WC_Customer', $result->getWcCustomer());
+        $this->assertInstanceOf('\WC_Order', $result->getWcOrder());
     }
 
     public function test_valid_no_customer()
     {
         $result = new WC_Retailcrm_Customer_Switcher_Result(null, new WC_Order());
         $this->assertEmpty($result->getWcCustomer())
-;        $this->assertInstanceOf(WC_Order::class, $result->getWcOrder());
+;        $this->assertInstanceOf('\WC_Order', $result->getWcOrder());
     }
 }
diff --git a/tests/test-wc-retailcrm-history.php b/tests/test-wc-retailcrm-history.php
index d46176a..277701f 100644
--- a/tests/test-wc-retailcrm-history.php
+++ b/tests/test-wc-retailcrm-history.php
@@ -619,7 +619,7 @@ class WC_Retailcrm_History_Test extends WC_Retailcrm_Test_Case_Helper
 
     private function regenerateMocks()
     {
-        $this->apiMock = $this->getMockBuilder(WC_Retailcrm_Proxy::class)
+        $this->apiMock = $this->getMockBuilder('\WC_Retailcrm_Proxy')
             ->disableOriginalConstructor()
             ->setMethods(array(
                 'ordersHistory',
diff --git a/tests/test-wc-retailcrm-plugin.php b/tests/test-wc-retailcrm-plugin.php
index 9c6fd04..07ddf1e 100644
--- a/tests/test-wc-retailcrm-plugin.php
+++ b/tests/test-wc-retailcrm-plugin.php
@@ -70,23 +70,24 @@ class WC_Retailcrm_Plugin_Test extends WC_Retailcrm_Test_Case_Helper
     public function dataProviderIntegrationModule()
     {
         $this->setUp();
+        $responseData = $this->getResponseData();
 
         return array(
             array(
-                'retailcrm' => $this->getApiMock($this->getResponseData()['true']),
-                'response' => $this->getResponseData()['true']
+                'retailcrm' => $this->getApiMock($responseData['true']),
+                'response' => $responseData['true']
             ),
             array(
                 'retailcrm' => false,
-                'response' => $this->getResponseData()['true']
+                'response' => $responseData['true']
             ),
             array(
-                'retailcrm' => $this->getApiMock($this->getResponseData()['false']),
-                'response' => $this->getResponseData()['false']
+                'retailcrm' => $this->getApiMock($responseData['false']),
+                'response' => $responseData['false']
             ),
             array(
                 'retailcrm' => false,
-                'response' => $this->getResponseData()['false']
+                'response' => $responseData['false']
             )
         );
     }