java - 使用 hamcrest 检查列表是否包含特定顺序的类实例

Question

嗨，我正在编写一个单元测试，我需要断言列表包含按特定顺序的多个类的对象。我想用 hamcrest 来做到这一点。

现在我断言它就像 -

assertThat(actual, hasItem(isA(A.class)));
assertThat(actual, hasItem(isA(B.class)));
assertThat(actual, hasItem(isA(C.class)));

这里我想测试一下项目的顺序是A->B->C。我试过这样写 -

assertThat(actual, contains(isA(A.class), isA(B.class), isA(C.class)));

但这不受支持，有没有办法用 hamcrest 匹配器实现这一点？

Answer 1

使用this method :

public static <E> Matcher<java.lang.Iterable<? extends E>> containsInRelativeOrder(Matcher<? super E>... itemMatchers)

来自文档:

Creates a matcher for Iterables that matches when a single pass over the examined Iterable yields a series of items, that each satisfying the corresponding matcher in the specified matchers, in the same relative order. For example: assertThat(Arrays.asList("a", "b", "c", "d", "e"), containsInRelativeOrder(equalTo("b"), equalTo("d")))

就您而言，可能是这样的:

assertThat(actual, containsInRelativeOrder(isA(A.class), isA(B.class), isA(C.class)));

自 Hamcrest 2.0.0.0 起可用。