Add test showing current behaviour when createStubForIntersectionOfInterfaces is called with a class

Author: kubawerlos

tests/unit/Framework/MockObject/Creation/CreateStubForIntersectionOfInterfacesTest.php

@@ -18,6 +18,7 @@
 use PHPUnit\TestFixture\MockObject\AnInterface;
 use PHPUnit\TestFixture\MockObject\AnotherInterface;
 use PHPUnit\TestFixture\MockObject\AnotherInterfaceThatDoesSomething;
+use PHPUnit\TestFixture\MockObject\ExtendableClass;
 
 #[Group('test-doubles')]
 #[Group('test-doubles/creation')]
@@ -71,4 +72,12 @@ public function testCannotCreateTestStubForIntersectionOfInterfacesThatDeclareTh
 
         $this->createStubForIntersectionOfInterfaces([AnInterface::class, AnotherInterfaceThatDoesSomething::class]);
     }
+
+    public function testCannotCreateTestStubForIntersectionOfInterfacesWhenClassIsUsed(): void
+    {
+        $this->expectException(UnknownTypeException::class);
+        $this->expectExceptionMessage('Class or interface "PHPUnit\TestFixture\MockObject\ExtendableClass" does not exist');
+
+        $this->createStubForIntersectionOfInterfaces([AnInterface::class, ExtendableClass::class]);
+    }
 }