hamcrest tests always fail

问题

I am using hamcrest 1.3 to test my code. It is simply a die. I am trying to test it to make sure the number generated is less than 13. I had a print statement that printed what the number generated was. The number generated was always less than 13 but the test always failed. Is there something I am doing wrong?

This is the code I am testing.

import java.util.Random;

public class Die {
    private int numSides;
    Random rand;

    public Die(int numSides){
        this.numSides = numSides;
        rand = new Random(System.currentTimeMillis());
    }

    public int roll(){
        return rand.nextInt(numSides) + 1;
    }
}

And this is my test code.

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

import org.junit.Test;

public class DieTest {
    @Test
    public void testRoll() {
        Die x = new Die(12);    
        assertThat(x.roll(), is(lessThan(13)));
    }
}

Edit: This is the failure stack trace.

java.lang.SecurityException: class "org.hamcrest.Matchers"'s signer information does not match signer information of other classes in the same package
at java.lang.ClassLoader.checkCerts(Unknown Source)
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at DieTest.testRoll(DieTest.java:12)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

回答1:

This is the site that help me solve the problem.

http://code.google.com/p/hamcrest/issues/detail?id=128

The hamcrest.jar needs to go before the Junit library in the build path.

回答2:

I just removed JUnit library from my project configuration. I still can run the tests as JUnit is also included in my pom file. So the solution just use the library from Maven.

回答3:

In my Eclipse inside Project settings in Java Build Path section, Libraries I have previously added internal JUnit library which uses JUnit version 4.8 and hamcrest-core version 1.1. I believe that that was causing this error in my case.

I leave this bit of information here, maybe somebody else would benefit from my experience.

回答4:

Use junit-dep.jar rather than junit.jar- this is JUnit minus its dependencies. Junit.jar contains an old version of Hamcrest.

回答5:

If you are using a Maven project, simply remove the Junit library from the build path and instead import Junit and Hamcrest separately via POM.

回答6:

Johan Mark (above) suggested to

rename the file $ECLIPSE_HOME\plugins\org.hamcrest.core_1.3.0.v201303031735.jar to something like *.bak or remove the file."

Renaming/removing the file caused my Eclipse Junit library to stop working, but replacing the JAR file with a copy of the same version from my Maven repo made the certificate problem go away.

(As someone on Google remarked, the Eclipse Junit copy of hamcrest has a cert issue but the Maven copy does not...)

回答7:

First of all make sure that you have added JUnit dependency in POM.xml file.

Now, right click on the project and go to properties, select Java build path and select Libraries tab.

In my case there were Maven dependencies, JRE and Junit4 libraries. And I just removed Junit library and it works for me. Or one can also reorder the libraries as due to build order of Hamcrest and JUnit4 the problem was occurring.

回答8:

I was getting the same exception. Like beachw08 recommended, I referred to:

http://code.google.com/p/hamcrest/issues/detail?id=128

One of the posts said:

rename the file $ECLIPSE_HOME\plugins\org.hamcrest.core_1.3.0.v201303031735.jar to something like *.bak or remove the file.

I did this and it solved my problem.

回答9:

If you get the following exception "java.lang.SecurityException: class "org.hamcrest.Matchers"'s signer information does not match signer information of other classes in the same package", ensure that the hamcrest jar is before the Junit library in the build path. You can configure the order in the project properties under Java Build Path on the Order and Export tab. click below image link for more clarity : http://i.stack.imgur.com/Y5R15.png

回答10:

I resolved this problem by removing Junit4 library from the Build Path and added TestNG Library to the build path and imported TestNG annotations instead of Junit4 annotations in my java program.

回答11:

I had the same problem as detailed here. I believe the problem comes down to the junit4 jar file.

If, under eclipse pom editor, you look at the junit4 Hierarchy you will see that it has a dependency on hamcrest-core (i.e. hamcrest-core will, by default, be pulled in on compile). In my unit test code I use the hamcrest collection Matchers (org.hamcrest.collection). These aren't included in the core jar and I set up a dependency on hamcrest-all in the pom. Doing this duplicates the hamcrest-core inclusion and appear to leave you open to a version mismatch with the junit hamcrest-core dependency and hence the security exception. I removed the hamcrest-all dependency and replaced it with hamcrest-library and the exception went away.

If you only use core hamcrest then you should not set up your own dependency and rely on the version junit pulls in. Alternately, as suggested in another comment, use junit-dep to strip out the junit dependency and then include hamcrest-all.

回答12:

i recently had this problem with eclipse and Junit.

To solve this, i did that:

1 - Download the latest hamcrest-all jar from here : https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/hamcrest/

2- Go on the eclipse installation folder: eclipse/plugin/ and find the org.hamcrest...jar

3- make a backup of the step 2 jar and replace it by the step 1 jar (rename it same as the jar step 2).

4- restart eclipse

After that, my issue was solved.

回答13:

When trying to solve this problem for your particular context, keep in mind the stack trace above is merely a symptom. The solutions may work for some people, but not others.

For instance:

Putting the Hamcrest JAR before the JUnit JAR in the classpath will work in situations where the version of JUnit in use (older) contains Hamcrest classes
Overlaying the version of Hamcrest used internally by Eclipse with a 'stock' version that's been renamed to match the internal version may work if no other Eclipse plugin bundle uses manifest information in the original internal JAR

In my case, the symptom above was caused by a Hamcrest JAR used internally and provided by Eclipse, and when I tried to replaced it with a 'stock' renamed version, anything related to JUnit failed to load when I started Eclipse. After I reverted back to the original internal version, the SecurityException returned. The solution that worked for me was to delete the manifest in the JAR using 7-Zip. This effectively 'unsigned' the JAR and now my particular configuration works.

回答14:

my environment Mac OS + eclipse, I found org.hamcrest.core_1.3.0.v201303031735.jar is in my JUnit 4, so I can't make it forward than junit.jar.

so I delete it from path ~/.p2/pool/plugins/, then refresh project, it works.

回答15:

This one resolved my issue :

Replace $ECLIPSE_HOME\plugins\org.hamcrest.core_1.3.0.v201303031735.jar with Maven or your project's lib's hamcrest-core-xx.jar (obviously renaming it to same name as eclipse jar)

回答16:

I went into the build properties for the project and changed JUNIT from version 4 to version 3 and it works fine now.

Interestingly I still have version 4 in my pom.xml so I am inclined to think that this is an eclipse issue (I was able to build and run my tests via terminal just fine).

回答17:

I did the following:

First in pom file i excluded hamcrest-core from junit dependency and used instead hamcrest-all. Second i removed from build path the eclipse JUNIT as it overrides the maven one. The ordering didn't affect my jars since the bad jar was excluded.

回答18:

I had exactly the same issue. I created a new project and it resolved my issue.

回答19:

If you are Using Maven:

Steps:

Add Latest Hamcrest Dependency into POM, from here https://mvnrepository.com/artifact/org.hamcrest/hamcrest-all
Add Latest JUnit Dependency into POM,from Here https://mvnrepository.com/artifact/junit/junit
Remove Any JUnit libraries from the Build path.

As Shown here

and Here

After you have Completed all above steps , Refresh your Project and Run.

回答20:

Removed the JUNIT 4 library from the libraries tab on Eclipse -> Java Build path and it worked.

来源：https://stackoverflow.com/questions/9651784/hamcrest-tests-always-fail

标签

java

junit

hamcrest