jUnit中的CollectionAssert？ [英] CollectionAssert in jUnit?

问题描述

是否存在与NUnit的 CollectionAssert 并行的jUnit？

Is there a jUnit parallel to NUnit's CollectionAssert?

推荐答案

使用JUnit 4.4你可以使用 assertThat（）和< a href =http://hamcrest.org/JavaHamcrest/ =noreferrer> Hamcrest 代码（不用担心，它随JUnit一起提供，不需要额外的。 jar ）生成复杂的自描述断言，包括对集合进行操作的断言：

Using JUnit 4.4 you can use assertThat() together with the Hamcrest code (don't worry, it's shipped with JUnit, no need for an extra .jar) to produce complex self-describing asserts including ones that operate on collections:

import static org.junit.Assert.assertThat;
import static org.junit.matchers.JUnitMatchers.*;
import static org.hamcrest.CoreMatchers.*;

List<String> l = Arrays.asList("foo", "bar");
assertThat(l, hasItems("foo", "bar"));
assertThat(l, not(hasItem((String) null)));
assertThat(l, not(hasItems("bar", "quux")));
// check if two objects are equal with assertThat()

// the following three lines of code check the same thing.
// the first one is the "traditional" approach,
// the second one is the succinct version and the third one the verbose one 
assertEquals(l, Arrays.asList("foo", "bar")));
assertThat(l, is(Arrays.asList("foo", "bar")));
assertThat(l, is(equalTo(Arrays.asList("foo", "bar"))));

使用这种方法，您可以在失败时自动获得断言的良好描述。

Using this approach you will automagically get a good description of the assert when it fails.

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