Add more tests

Author: fineg74

SYCL/ESIMD/regression/copyto_char_test.cpp

@@ -119,6 +119,8 @@ int main() {
   test_result |= test_to_copy<32 + 10>();
   test_result |= test_to_copy<10>();
   test_result |= test_to_copy<8>();
+  test_result |= test_to_copy<7>();
+  test_result |= test_to_copy<15>();
 
   if (!test_result) {
     std::cout << "Test passed" << std::endl;