docs: private void verifyKeyExistenceMatchesExpectation(JsonObject jsonDataToValidate) {
          boolean jsonDataContainsKey = jsonDataToValidate.containsKey(validationKey);
          if (expCheckType == JsonCheckType.KEY_DOES_NOT_EXIST) {
              assertFalse("The provided content contains a \"" + validationKey + "\" key but should not. The content to validate was: [" + jsonDataToValidate + "].", jsonDataContainsKey);
          } else {
              assertTrue("The provided content does not contain a \"" + validationKey + "\" key but should. The content to validate was: [" + jsonDataToValidate + "].", jsonDataContainsKey);
          }
      }