public <T> void assertIs(Description description, T actual, Matcher<? super T> matcher) {
    checkNotNull(matcher);
    if (!matcher.matches(actual)) {
      String format = "expecting:<%s> to be:<%s>";
      throw failures.failure(description, new BasicErrorMessageFactory(format, actual, matcher));
    }
  }
public <T> void assertIs(Description description, T actual, Matcher<? super T> matcher) {
    checkNotNull(matcher);
    if (!matcher.matches(actual)) {
      String format = "expecting:<%s> to be:<%s>";
      throw failures.failure(description, new BasicErrorMessageFactory(format, actual, matcher));
    }
  }
public < T > void assertIs ( Description description , T actual , Matcher < ? super T > matcher ) { checkNotNull ( matcher ) ; if ( ! matcher . matches ( actual ) ) { String format = "expecting:<%s> to be:<%s>" ; throw failures . failure ( description , new BasicErrorMessageFactory ( format , actual , matcher ) ) ; } }
Asserts that the <em>actual</em> value satisfies the given {@link Matcher}.

@param <T> the type of the actual value and the type of values that given {@code Matcher} takes.
@param description the description of the <em>actual</em> object.
@param actual the <em>actual</em> value.
@param matcher the given {@code Matcher}.
@throws NullPointerException if the given {@code Matcher} is {@code null}.
@throws AssertionError if the <em>actual</em> value does not satisfy the given {@code Matcher}.
Asserts that the <em > actual< / em > value satisfies the given { @link Matcher } .