Cannot find symbol assertEquals

问题:

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 + "));
    }
}

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

import org.junit.Test;

回答1:

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(...)

or:

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

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

So you should import it like:

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?.

回答2:

JUnit 5 Jupiter

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

So you have to add the following static import:

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

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

回答3:

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

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

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

So if you are facing problem regarding assertEqual not recognized, then change it to Assert.assertEquals(,); it should solve your problem

回答4:

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

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;

but the solution that did the magic was just place the junit-4.12.jar in the app\lib ditectory and just build the project, and import like this

import org.junit.Assert;

you can download the junit-4.12.jar from here

回答5:

You have to add the dependency to pom.xml file

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

回答6:

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

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

but now instead of

Assert.assertEquals(expected, actual);

use

assertEquals(expected, actual);