Java 找不到符号 assertEquals

Cannot find symbol assertEquals

提问by Giome Pool Guy

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

我正在尝试为计算器编写我的第一个单元测试，但 NetBeans 说它找不到符号assertEquals和注释@Test。
我应该包括一些东西吗？
我使用的是 NetBeans 7.3.1 和 W7。

package calculator;

import org.junit.Assert.*;

public class UnitTests{

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

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

编辑：谢谢你们，将它作为静态导入有帮助。只需要测试注释，包括

import org.junit.Test;

导入 org.junit.Test;

采纳答案by bobbel

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

assertEquals是一个静态方法。由于您不能使用静态方法而不以静态方式显式导入它们，因此您必须使用：

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

or:

或者：

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

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

因为@Test它有点不同。@Test是一个注释，如您所见@。注释像类一样导入。

So you should import it like:

所以你应该像这样导入它：

import org.junit.Test;

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?.

通常避免在导入时使用通配符，例如import org.junit.*. 原因请参见为什么在 Java 导入语句中使用通配符不好？.

回答by Akshay Vijay Jain

I am working on JUnit in java 8 environment, using jUnit4.12

我正在使用 jUnit4.12 在 java 8 环境中处理 JUnit

for me: compiler was not able to find the method assertEquals, even when I used
import org.junit.Assert;

对我来说：编译器无法找到方法 assertEquals，即使我使用
import org.junit.Assert;

So I changed
assertEquals("addb", string);
to
Assert.assertEquals("addb", string);

所以我改变了
assertEquals("addb", string);
对
Assert.assertEquals("addb", string);

So if you are facing problem regarding assertEqualnot recognized, then change it to Assert.assertEquals(,);it should solve your problem

因此，如果您遇到有关assertEqual无法识别的问题，请将Assert.assertEquals(,);其更改为它应该可以解决您的问题

回答by isapir

JUnit 5 Jupiter

JUnit 5木星

In JUnit 5 the package name has changed and the Assertions are at org.junit.jupiter.api.Assertionsand Assumptions at org.junit.jupiter.api.Assumptions

在 JUnit 5 中，包名发生了变化，断言在org.junit.jupiter.api.Assertions，假设在org.junit.jupiter.api.Assumptions

So you have to add the following static import:

所以你必须添加以下内容static import：

import static org.junit.jupiter.api.Assertions.*;

See also http://junit.org/junit5/docs/current/user-guide/#writing-tests-assertions

另见http://junit.org/junit5/docs/current/user-guide/#writing-tests-assertions

回答by Tu Minh

You have to add the dependency to pom.xml file

您必须将依赖项添加到 pom.xml 文件

<dependency>
  <groupId>junit</groupId>          
  <artifactId>junit</artifactId>            
  <version>4.12</version>       
</dependency>

回答by Ali Tamoor

I was having the same problem cannot resolve symbol Asserti have tried these solutions by adding the different import from the different answers.

我遇到了同样的问题，cannot resolve symbol Assert我通过从不同的答案中添加不同的导入来尝试这些解决方案。

1. import org.junit.Assert;
2. import static org.junit.Assert.*;
3. import static org.junit.Assert.assertEquals;
4. import static org.junit.jupiter.api.Assertions.*;
5. import org.junit.Assert;

1. 导入 org.junit.Assert;
2. 导入静态 org.junit.Assert.*;
3. 导入静态 org.junit.Assert.assertEquals;
4. 导入静态 org.junit.jupiter.api.Assertions.*;
5. 导入 org.junit.Assert;

but the solution that did the magic was just place the junit-4.12.jarin the app\libditectory and just build the project, and import like this

但是神奇的解决方案只是将junit-4.12.jar放在app\lib字典中并构建项目，然后像这样导入

import org.junit.Assert;

you can download the junit-4.12.jarfrom here

你可以junit-4.12.jar从这里下载

回答by Paolo Secci

Using IntelliJ 2019.2.4 with a start.sping.io default setup...

使用 IntelliJ 2019.2.4 和 start.sping.io 默认设置...

import static org.junit.jupiter.api.Assertions.assertEquals;

but now instead of

但现在而不是

Assert.assertEquals(expected, actual);

use

用

assertEquals(expected, actual);