HamcrestSugar.java

package com.josketres.test.util;

import org.hamcrest.FeatureMatcher;
import org.hamcrest.Matcher;

import java.util.function.Function;

/**
 * Utilities and syntactic sugar stuff for hamcrest.
 */
public class CaraHamcrestSugar {

  private CaraHamcrestSugar() {
  }

  /**
   * An easier way to create a FeatureMatcher.
   */
  public static <T, U> Matcher<T> featureMatcher(Function<T, U> map, String featureName, Matcher<? super U> subMatcher) {
    return new FeatureMatcher<T, U>(subMatcher, featureName, featureName) {
      @Override
      protected U featureValueOf(T o) {
        return map.apply(o);
      }
    };
  }

}