java Hamcrest 断言那模棱两可？
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Hamcrest assertThat ambiguous?
提问by MartinL
I got some samplecode from a college, imported the project and try to run the Tests: The method assertThat(Integer, Matcher) is ambiguous for the type MyClass
我从一所大学得到了一些示例代码，导入了项目并尝试运行测试：方法 assertThat(Integer, Matcher) 对于 MyClass 类型是不明确的
Every assertThat is marked red with the same error-message so i tried to write the simpliest test which describes the problem:
每个断言都用相同的错误消息标记为红色，因此我尝试编写描述问题的最简单的测试：
import static org.hamcrest.MatcherAssert.*;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;
@Test
public void whenAssertThatThenItIsAmbiguous() {
List<String> list = Arrays.asList("A", "B", "C");
assertThat(list.size(), is(3));
}
after I scroll over assertThat I get the following message:
在我滚动到 assertThat 后，我收到以下消息：
The method assertThat(Integer, Matcher<Integer>) is ambiguous for the type MyClass
I searched google and stackoverflow but couldn't find anybody with the same problem... Please help.
我搜索了 google 和 stackoverflow，但找不到任何有同样问题的人......请帮忙。
EDIT1:
编辑1：
Solution:
解决方案：
import static org.junit.Assert.*;// delete this line
导入静态 org.junit.Assert.*; // 删除这一行
回答by pholser
Both org.junit.Assertand org.hamcrest.MatcherAssertdeclare assertThat(T, Matcher<T>). Choose to static-import one or the other, but not both, and you should be OK.
两者org.junit.Assert和org.hamcrest.MatcherAssert声明assertThat(T, Matcher<T>)。选择静态导入一个或另一个，但不是两个，你应该没问题。
回答by Dave Newton
There's two general causes for this, unqualified static imports (import static blah.*), or multiple versions of hamcrest on the path.
造成这种情况的一般原因有两个：不合格的静态导入 ( import static blah.*) 或路径上存在多个版本的 hamcrest。
You may be able to get around it by using the long-form is(equalTo(3))(kind of doubt it), culling your static imports, etc.
您可以通过使用长格式is(equalTo(3))（有点怀疑），剔除静态导入等来解决它。
Which framework you're using it with can matter, too.
您使用的框架也很重要。
