diff --git a/src/Meritoo/Common/Test/Base/BaseTestCase.php b/src/Meritoo/Common/Test/Base/BaseTestCase.php
index 7a5c1d5..ee7db79 100644
--- a/src/Meritoo/Common/Test/Base/BaseTestCase.php
+++ b/src/Meritoo/Common/Test/Base/BaseTestCase.php
@@ -135,7 +135,7 @@ abstract class BaseTestCase extends TestCase
      * - string - name of the method
      * - instance of ReflectionMethod - just the method (provided by ReflectionClass::getMethod() method)
      */
-    protected function verifyMethodVisibilityAndArguments(
+    protected static function assertMethodVisibilityAndArguments(
         $classNamespace,
         $method,
         $visibilityType,
@@ -188,7 +188,7 @@ abstract class BaseTestCase extends TestCase
      *                                       method
      * @throws UnknownOopVisibilityTypeException
      */
-    protected function verifyConstructorVisibilityAndArguments(
+    protected static function assertConstructorVisibilityAndArguments(
         $classNamespace,
         $visibilityType,
         $argumentsCount = 0,
@@ -200,7 +200,7 @@ abstract class BaseTestCase extends TestCase
         $reflection = new ReflectionClass($classNamespace);
         $method = $reflection->getConstructor();
 
-        return $this->verifyMethodVisibilityAndArguments($classNamespace, $method, $visibilityType, $argumentsCount, $requiredArgumentsCount);
+        return static::assertMethodVisibilityAndArguments($classNamespace, $method, $visibilityType, $argumentsCount, $requiredArgumentsCount);
     }
 
     /**
diff --git a/tests/Meritoo/Common/Test/Collection/CollectionTest.php b/tests/Meritoo/Common/Test/Collection/CollectionTest.php
index bfeb579..9fa0309 100644
--- a/tests/Meritoo/Common/Test/Collection/CollectionTest.php
+++ b/tests/Meritoo/Common/Test/Collection/CollectionTest.php
@@ -306,7 +306,7 @@ class CollectionTest extends BaseTestCase
 
     public function testExistsVisibilityAndArguments()
     {
-        $this->verifyMethodVisibilityAndArguments(Collection::class, 'exists', OopVisibilityType::IS_PRIVATE, 1, 1);
+        static::assertMethodVisibilityAndArguments(Collection::class, 'exists', OopVisibilityType::IS_PRIVATE, 1, 1);
     }
 
     /**
diff --git a/tests/Meritoo/Common/Test/Utilities/DatePeriodTest.php b/tests/Meritoo/Common/Test/Utilities/DatePeriodTest.php
index ccc8d60..af8ff69 100644
--- a/tests/Meritoo/Common/Test/Utilities/DatePeriodTest.php
+++ b/tests/Meritoo/Common/Test/Utilities/DatePeriodTest.php
@@ -24,7 +24,7 @@ class DatePeriodTest extends BaseTestCase
 {
     public function testConstructorVisibilityAndArguments()
     {
-        $this->verifyConstructorVisibilityAndArguments(DatePeriod::class, OopVisibilityType::IS_PUBLIC, 2, 0);
+        static::assertConstructorVisibilityAndArguments(DatePeriod::class, OopVisibilityType::IS_PUBLIC, 2, 0);
     }
 
     /**