本文整理了Java中com.pholser.junit.quickcheck.generator.Generator.shrink()方法的一些代码示例，展示了Generator.shrink()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Generator.shrink()方法的具体详情如下：
包路径：com.pholser.junit.quickcheck.generator.Generator
类名称：Generator
方法名：shrink

Generator.shrink介绍

[英]Generators first ensure that they #canShrink(Object) in shrinking the given value, and if so, they #doShrink(SourceOfRandomness,Object).
[中]生成器首先确保在收缩给定值时可以收缩（对象），如果可以，则可以收缩（随机性源，对象）。

代码示例

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Optional> doShrink(
  SourceOfRandomness random,
  Optional larger) {
  if (!larger.isPresent())
    return new ArrayList<>();
  List<Optional> shrinks = new ArrayList<>();
  shrinks.add(Optional.absent());
  shrinks.addAll(
    componentGenerators().get(0)
      .shrink(random, larger.get())
      .stream()
      .map(Optional::fromNullable)
      .collect(toList()));
  return shrinks;
}

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Optional> doShrink(
  SourceOfRandomness random,
  Optional larger) {
  if (!larger.isPresent())
    return new ArrayList<>();
  List<Optional> shrinks = new ArrayList<>();
  shrinks.add(Optional.empty());
  shrinks.addAll(
    componentGenerators().get(0)
      .shrink(random, larger.get())
      .stream()
      .map(Optional::of)
      .collect(toList()));
  return shrinks;
}

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Object> doShrink(SourceOfRandomness random, Object larger) {
  List<Weighted<Generator<?>>> shrinkers =
    composed.stream()
      .filter(w -> w.item.canShrink(larger))
      .collect(toList());
  Generator<?> choice = Items.chooseWeighted(shrinkers, random);
  return new ArrayList<>(choice.shrink(random, larger));
}

代码示例来源：origin: pholser/junit-quickcheck

public List<Object> shrink(Object larger) {
  return generator.canShrink(larger)
    ? new ArrayList<>(generator.shrink(random(), larger))
    : emptyList();
}

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Segment> doShrink(
    SourceOfRandomness r,
    Segment larger) {

    Generator<Point> pointGen = gen().type(Point.class);

    return zip(
      pointGen.shrink(r, larger.a).stream(),
      pointGen.shrink(r, larger.b).stream(),
      Segment::new
    ).collect(toList());
  }
}

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Either> doShrink(
  SourceOfRandomness random,
  Either larger) {
  @SuppressWarnings("unchecked")
  Either<Object, Object> either = (Either<Object, Object>) larger;
  return either.map(
    left -> componentGenerators().get(0).shrink(random, left)
      .stream()
      .map(Either::makeLeft)
      .collect(toList()),
    right -> componentGenerators().get(1).shrink(random, right)
      .stream()
      .map(Either::makeRight)
      .collect(toList()));
}

代码示例来源：origin: pholser/junit-quickcheck

@Test public void nonShrinkingGeneratorAttemptingToShrink() {
    thrown.expect(IllegalStateException.class);

    nonShrinkingGenerator.shrink(null, new Object());
  }
}

代码示例来源：origin: pholser/junit-quickcheck

@Override public List<Polygon> doShrink(
    SourceOfRandomness r,
    Polygon larger) {

    Generator<Point> pointGen = gen().type(Point.class);

    return singletonList(
      new Polygon(
        larger.points.stream()
          .map(p -> pointGen.shrink(r, p).get(0))
          .collect(toList())));
  }
}

代码示例来源：origin: pholser/junit-quickcheck

@Test public void actOfShrinking() {
  assertEquals(emptyList(), generator.shrink(null, new Object()));
}

代码示例来源：origin: com.pholser/junit-quickcheck-guava

@Override public List<Optional> doShrink(
  SourceOfRandomness random,
  Optional larger) {
  if (!larger.isPresent())
    return new ArrayList<>();
  List<Optional> shrinks = new ArrayList<>();
  shrinks.add(Optional.absent());
  shrinks.addAll(
    componentGenerators().get(0)
      .shrink(random, larger.get())
      .stream()
      .map(Optional::fromNullable)
      .collect(toList()));
  return shrinks;
}

代码示例来源：origin: com.pholser/junit-quickcheck-generators

@Override public List<Optional> doShrink(
  SourceOfRandomness random,
  Optional larger) {
  if (!larger.isPresent())
    return new ArrayList<>();
  List<Optional> shrinks = new ArrayList<>();
  shrinks.add(Optional.empty());
  shrinks.addAll(
    componentGenerators().get(0)
      .shrink(random, larger.get())
      .stream()
      .map(Optional::of)
      .collect(toList()));
  return shrinks;
}

代码示例来源：origin: com.pholser/junit-quickcheck-core

@Override public List<Object> doShrink(SourceOfRandomness random, Object larger) {
  List<Weighted<Generator<?>>> shrinkers =
    composed.stream()
      .filter(w -> w.item.canShrink(larger))
      .collect(toList());
  Generator<?> choice = Items.chooseWeighted(shrinkers, random);
  return new ArrayList<>(choice.shrink(random, larger));
}

代码示例来源：origin: com.pholser/junit-quickcheck-core

public List<Object> shrink(Object larger) {
  return generator.canShrink(larger)
    ? new ArrayList<>(generator.shrink(random(), larger))
    : emptyList();
}