junitparameter exception method should have no parameter

Question

By using JUnitParameter for testing a methode I have an exception. My code is similar to lot of example on JUnitParameter:

    private Object parametersForTe         


        

Answer 1

I stumbled across this article while looking for an issue to a similar problem. I was getting an exception like this:

java.lang.Exception: Method x should have no parameters

It turns out I was using the wrong import for the @Test annotation. I originally used import org.junit.Test; but what I needed to use was import org.junit.jupiter.api.Test;

Long story short, make sure you are checking your imports, sometimes the auto-generated ones aren't really what you want.

Answer 2

Imports need to be updated like :

import com.entities.Client;
import junitparams.JUnitParamsRunner;
import junitparams.Parameters;
import static org.junit.Assert.*;
import org.junit.Test;
import org.junit.runner.RunWith;

Now it works

Answer 3

This error may show up when your test method(having @Test annotation) have any arguments

For anyone else who came here because of the same error they are seeing but not with JUitParameter.

I hit this same error, in my code.

java.lang.Exception: Method assertResult() should be public


at org.junit.runners.model.FrameworkMethod.validatePublicVoid(FrameworkMethod.java:96)
at org.junit.runners.model.FrameworkMethod.validatePublicVoidNoArg(FrameworkMethod.java:74)
at org.junit.runners.ParentRunner.validatePublicVoidNoArgMethods(ParentRunner.java:155)
at org.junit.runners.BlockJUnit4ClassRunner.validateTestMethods(BlockJUnit4ClassRunner.java:208)
at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:188)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:128)
at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:36)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

The error was because for a method with argument, I had accidentally added a @Test tag. (Added it when I was testing just that method and then forgot to remove it). Silly me. Worked fine when I removed the @Test. If you want the @Test, then the method shouldn't have any arguments

@Test
void assertResult(String result) {
    Assert.assertTrue(!"403".equals(result) && !"404".equals(result) && !"400".equals(result));
    Assert.assertNotNull(result);
} 

Answer 4

You are using wrong import for @Parameters - it should be junitparams.Parameters, not org.junit.runners.Parameterized.Parameters

Answer 5

Add @RunWith(JUnitParamsRunner.class) annotation above class as

@RunWith(JUnitParamsRunner.class)
public class TestClass {

Also you need to import

import junitparams.JUnitParamsRunner;

Answer 6

If you are using JMockit, then adding below snippet resolves the issue

import mockit.integration.junit4.JMockit;

@RunWith(JMockit.class)
public class TestClass