找不到符号assertEquals [英] Cannot find symbol assertEquals

问题描述

我正在尝试为计算器编写第一个单元测试，但是NetBeans表示找不到符号assertEquals和注释@Test.
我应该包括一些东西吗?
我正在使用NetBeans 7.3.1和W7.

I'm trying to write my first unit tests for a calculator, but NetBeans says it can't find the symbol assertEquals and annotation @Test.
Should i include something?
I'm using NetBeans 7.3.1 and W7.

package calculator;

import org.junit.Assert.*;

public class UnitTests{

    @Test
    public void checkAdd(){
        assertEquals(2, Calculator.rpnCalc(" 2 3 + "));
    }
}

谢谢大家，将其导入为静态帮助. 测试注释仅需包含

Thanks guys, importing it as static helped. Test annotation required only including

导入org.junit.Test;

import org.junit.Test;

推荐答案

assertEquals是静态方法.由于必须先以静态方式显式导入静态方法，才能使用静态方法，因此必须使用以下两种方法之一:

assertEquals is a static method. Since you can't use static methods without importing them explicitly in a static way, you have to use either:

import org.junit.Assert;
...
Assert.assertEquals(...)

或:

import static org.junit.Assert.assertEquals;
...
assertEquals(...)

对于@Test，这有点不同.正如您在@中看到的那样，@Test是注释.注释就像类一样导入.

For @Test it's a little bit different. @Test is an annotation as you can see by the @. Annotations are imported like classes.

因此，您应该像这样导入它:

So you should import it like:

import org.junit.Test;

通常避免在import org.junit.*之类的导入上使用通配符.出于某些原因，请参见为什么要使用野生符号Java导入语句不好的智能卡?.

Generally avoid using wildcards on imports like import org.junit.*. For reasons see Why is using a wild card with a Java import statement bad?.

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