code: public @Nonnull
    StringAssert endsWith(@Nonnull String suffix) {
      strings.assertEndsWith(description, actual, suffix);
      return this;
    }
docs: Verifies that the <em>actual</em> {@code String} ends with the given suffix.
  
  @param suffix the given suffix.
  @return {@code this} assertion object.
  @throws NullPointerException if the given suffix is {@code null}.
  @throws AssertionError if the <em>actual</em> {@code String} is {@code null}.
  @throws AssertionError if the <em>actual</em> {@code String} does not end with the given suffix.