Merge pull request #15632 from aDanPin:dp/any_ref_tests

* Add a few more tests on `any`

Added tests:
- get_ref_to_val_from_any
- update_val_via_ref

* Style fix

modules/gapi/test/util/any_tests.cpp

@@ -118,4 +118,25 @@ TEST(Any, copy_assign)
    ASSERT_EQ(8      , any_cast<int>(a));
 }
 
+TEST(Any, get_ref_to_val_from_any)
+{
+   using namespace util;
+   int x = 8;
+   any a(x);
+
+   int& casted_ref =  any_cast<int>(a);
+   ASSERT_EQ(casted_ref, 8);
+}
+
+TEST(Any, update_val_via_ref)
+{
+   using namespace util;
+   int x = 8;
+   any a(x);
+   int& casted_ref = any_cast<int>(a);
+   ASSERT_EQ(casted_ref, 8);
+
+   casted_ref = 7;
+   ASSERT_EQ(any_cast<int>(a), 7);
+}
 } // namespace opencv_test