code: public AbstractIntegerAssert<?> asInt() {
          isNotNull();
          int value = 0;
          try {
              value = Integer.parseInt(actual);
          } catch (NumberFormatException e) {
              throwAssertionError(shouldBeConvertible(actual, "int"));
          }
  
          return AssertionsAdapter.assertThat(value);
      }
docs: Returns an {@code Assert} object that allows performing assertions on integer value of the {@link String} under test.
  
  @throws AssertionError if the actual value is {@code null}.
  @throws AssertionError if the actual value does not contain a parsable integer