code: public static <S> void assertThat(S subject, Feature<? super S,Boolean> feature) {
          assertThat(subject, feature, isQuietlyTrue());
      }
docs: Assert that a sample of the feature is {@code true}.
  <p>Example:</p>
  <pre>
  {@code
  
  Page settingsPage = ...;
  Feature<Page,Boolean> displayed() { ... }
  ...
  assertThat(settingsPage, is(displayed()));
  }