text: #include <gtest/gtest.h>
  #include <str/heapstr>
  
  TEST(HeapString, Constructor)
  {
      using heapstr_t = str::heapstr;
  
      heapstr_t str1;
      heapstr_t str2('b', 25);
      heapstr_t str3("hello world\0 hi world");
      heapstr_t str4("hello world\0 hi world", 22);
      heapstr_t str5(str4.begin(), str4.end());
      heapstr_t str6({ 'h', 'e', 'l', 'l', 'o' });
      heapstr_t str7(str4);
      heapstr_t str8(str4.base());
  }