JUnit assertThat用のBetweenクラスを作ってみた

JUnitのassertThatで有効範囲を指定してテストを行うためのクラスを作った

使い方は

Assert.assertThat(2,Between.between(1,4));

みたいな感じ


以下コード

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
/**
 * Comparableなものをが特定の範囲内の値であるかどうかを判定する
 * @author takeshita
 *
 */
public class Between extends BaseMatcher<Comparable>{

 /**
  * lower <= value <= upper
  * @param lowerLimit
  * @param upperLimit
  * @return
  */
  public static Between between(Comparable lowerLimit ,Comparable upperLimit)
  {
    return between_UE_LE(lowerLimit,upperLimit);
  }
 /**
  * lower < value < upper
  * @param lowerLimit
  * @param upperLimit
  * @return
  */
  public static Between between_UT_LT(Comparable lowerLimit ,Comparable upperLimit)
  {
    return new Between(lowerLimit,upperLimit,0,0);
  }
 /**
  * lower <= value < upper
  * @param lowerLimit
  * @param upperLimit
  * @return
  */
  public static Between between_UE_LT(Comparable lowerLimit ,Comparable upperLimit)
  {
    return new Between(lowerLimit,upperLimit,1,0);
  }
 /**
  * lower < value <= upper
  * @param lowerLimit
  * @param upperLimit
  * @return
  */
  public static Between between_UT_LE(Comparable lowerLimit ,Comparable upperLimit)
  {
    return new Between(lowerLimit,upperLimit,0,-1);
  }
 
 /**
  * lower <= value <= upper
  * @param lowerLimit
  * @param upperLimit
  * @return
  */
  public static Between between_UE_LE(Comparable lowerLimit ,Comparable upperLimit)
  {
    return new Between(lowerLimit,upperLimit,1,-1);
  }
 
 
  Comparable lowerLimit ,upperLimit;
  int lowerThreshold = 0,upperThreshold = 0;
  private Between(Comparable lowerLimit ,Comparable upperLimit,
     int lowerThreshold,int upperThreshold)
  {
    this.lowerLimit = lowerLimit;
    this.upperLimit = upperLimit;
    this.lowerThreshold = lowerThreshold;
    this.upperThreshold = upperThreshold;
  }



  @Override
  public boolean matches(Object obj) {
    return lowerLimit.compareTo(obj) < lowerThreshold &&
    upperLimit.compareTo(obj) > upperThreshold;
  }



  @Override
  public void describeTo(Description desc) {
    desc.appendText(
      lowerLimit.toString() + 
      (lowerThreshold == 0 ? " < value " : " <= value ") +
      (upperThreshold == 0 ? "< " : "<= ") +
      upperLimit.toString());
    
  }
}