断言该集合"包含至少一个非null元素"

Question

我想验证集合是否包含至少一个非null元素.我试过is(not(empty())),但是这通过了下面的测试.

import org.junit.Test;

import java.util.ArrayList;
import java.util.Collection;

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.not;

public class SandBoxTest {
    @Test
    public void shouldTestThis() {
        Collection<Integer> collection = new ArrayList<Integer>();
        collection.add(null);

        assertThat(collection, is(not(empty())));
    }
}

有一种优雅/简单的方法吗？

不起作用的事情

@Test
public void should(){
    Collection<String> collection = new ArrayList();
    collection.add("gfas");
    collection.add("asda");
    assertThat(collection, contains(notNullValue()));
}

java.lang.AssertionError: 
Expected: iterable containing [not null]
     but: Not matched: "asda"
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)

Answer 1

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.*;

...

assertThat(collection, hasItem(notNullValue(Integer.class)));

不幸的是,有一个在Java 1.6的错误,这意味着你可能必须将其分割到所描述的2号线在这里,如果你使用的是1.6:

Matcher<Iterable<? super String>> matcher = hasItem(notNullValue(Integer.class));
assertThat(collection, matcher);

编辑这是您要求的FEST Assert示例:

import static org.fest.assertions.api.Assertions.assertThat;
...
assertThat(collection).doesNotContainNull();

FEST只需要一次静态导入,因此您可以获得完整的IDE自动完成功能.