Hamcrest比较收藏品 [英] Hamcrest compare collections

问题描述

我正在尝试比较2个列表：

I'm trying to compare 2 lists:

assertThat(actual.getList(), is(Matchers.containsInAnyOrder(expectedList)));

但想法

java: no suitable method found for assertThat(java.util.List<Agent>,org.hamcrest.Matcher<java.lang.Iterable<? extends model.Agents>>)
method org.junit.Assert.<T>assertThat(T,org.hamcrest.Matcher<T>) is not applicable
  (no instance(s) of type variable(s) T exist so that argument type org.hamcrest.Matcher<java.lang.Iterable<? extends model.Agents>> conforms to formal parameter type org.hamcrest.Matcher<T>)
method org.junit.Assert.<T>assertThat(java.lang.String,T,org.hamcrest.Matcher<T>) is not applicable
  (cannot instantiate from arguments because actual and formal argument lists differ in length)

我该如何写呢？

推荐答案

如果你想要断言两个列表是相同的，不要使用Hamcrest复杂化：

If you want to assert that the two lists are identical, don't complicate things with Hamcrest:

assertEquals(expectedList, actual.getList());

如果您真的打算执行不区分大小写的比较，可以调用 containsInAnyOrder varargs方法并直接提供值：

If you really intend to perform an order-insensitive comparison, you can call the containsInAnyOrder varargs method and provide values directly:

assertThat(actual.getList(), containsInAnyOrder("item1", "item2"));

（假设您的清单是 String ，而不是代理商，对于这个例子。）

(Assuming that your list is of String, rather than Agent, for this example.)

如果你真的想用内容调用相同的方法一个列表：

If you really want to call that same method with the contents of a List:

assertThat(actual.getList(), containsInAnyOrder(expectedList.toArray(new String[expectedList.size()]));

没有这个，你'用一个参数调用方法并创建一个 Matcher ，它希望匹配 Iterable 其中每个元素是列表。这不能用于匹配列表。

Without this, you're calling the method with a single argument and creating a Matcher that expects to match an Iterable where each element is a List. This can't be used to match a List.

也就是说，您无法将列表< Agent> 与匹配< Iterable< List< ;代理>> ，这是您的代码尝试的内容。

That is, you can't match a List<Agent> with a Matcher<Iterable<List<Agent>>, which is what your code is attempting.

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