diff --git a/tests/PHPUnit/Button/Endpoint/ChangeCartEndpointTest.php b/tests/PHPUnit/Button/Endpoint/ChangeCartEndpointTest.php
index ac3b2dc62..c9c2f970f 100644
--- a/tests/PHPUnit/Button/Endpoint/ChangeCartEndpointTest.php
+++ b/tests/PHPUnit/Button/Endpoint/ChangeCartEndpointTest.php
@@ -73,7 +73,7 @@ class ChangeCartEndpointTest extends TestCase
 
         expect('wp_send_json_success')
             ->with($responseExpectation);
-        $this->assertTrue($testee->handleRequest());
+        $this->assertTrue($testee->handle_request());
     }
 
     public function dataForTestProducts() : array {
diff --git a/tests/PHPUnit/Button/Helper/ThreeDSecureTest.php b/tests/PHPUnit/Button/Helper/ThreeDSecureTest.php
index b33b4da7d..669c812f3 100644
--- a/tests/PHPUnit/Button/Helper/ThreeDSecureTest.php
+++ b/tests/PHPUnit/Button/Helper/ThreeDSecureTest.php
@@ -32,7 +32,7 @@ class ThreeDSecureTest extends TestCase
         $order = \Mockery::mock(Order::class);
         $order->shouldReceive('paymentSource')->andReturn($source);
         $testee = new ThreeDSecure();
-        $result = $testee->proceedWithOrder($order);
+        $result = $testee->proceed_with_order($order);
         $this->assertEquals($expected, $result);
     }