Mocking object in Cucumber step test? "JMockit wasn't properly initialized" error

Question

we're trying to use Gherkin/Cucumber for the Unit test. In maven project, we used to use JUnit/Jmockit to perform unit test with following format, and it works well.

Old Junit test class used to work:

@RunWith(JMockit.class)
public class UnitTestClass{
    @Mocked
    AClass mockedObject;

    @Test
    public void AMethodTest() {
        try {
            new NonStrictExpectations() {
                {
                    ExampleObject.callAMethod();
                    result = mockedObject;
                }
            };
                     Assert.assertEquals(xxxxx);
                catch(Exception e){
                }  
}

After starting to use Gherkin/Cucumber, we are writing Unit class with below two classes:

@RunWith(Cucumber.class)
@CucumberOptions (features = "src/test/java/feature/")
//@RunWith(JMockit.class)
public class UnitTestClass{
}


@RunWith(JMockit.class)
public class UnitTestClassSteps{

    @Given("^an input data id: '(\\d+)'\\.$")
    @Test
    public void a_data_ID(int arg1) throws Throwable {

            try {
                **new NonStrictExpectations() {**
                    {
                        ExampleObject.callAMethod();
                        result = mockedObject;
                    }
                };
                    Assert.assertEquals(xxxxx);
               catch(Exception e){
               } 
   }

Once we start run UnitTestClass, it jumps into UnitTestClassStep class, and failed at new NonStrictExpectations step, the error is:

java.lang.AssertionError: Exception while calling Given steps JMockit wasn't properly initialized; check that jmockit.jar precedes junit.jar in the classpath (if using JUnit; if not, check the documentation) at org.junit.Assert.fail(Assert.java:88)

So can we use Jmockit in Cucumber step test class? what's the best practice if we need to mock object in step test class?

Thanks!

Have a look at this - http://stackoverflow.com/questions/2905735/jmockit-initialization-problem — Grasshopper, Oct 01 '16 at 10:24
I tried the option 1, add -javaagent:path/to/your/jmockit/jmockit-xxx.jar in JVM environment, now "JMockit wasn't properly initialized" error is gone, however, there is new error: java.lang.AssertionError: Exception while calling Given steps Invalid place to record expectations at org.junit.Assert.fail(Assert.java:88), any ideas? thanks! — GL., Oct 03 '16 at 15:12
I know very little about jmockit but seems like your jmockit is not being initialized. Can you try with @Mocked annotation for the object you are mocking. — Grasshopper, Oct 03 '16 at 16:12

score 0 · Answer 1 · answered Sep 27 '18 at 15:04

I've been using cucumber-java 1.2.5 with jMockit 1.3.0 and it worked like a charm. No hacks, not tricks, no complex setup whatsoever.

The only thing that happened is that jMockit itself complained to be declared before some other library, I think it was jUnit. It happened a few days ago, and it was an easy fix at the pom file, so I didn't care so much.

The test runner is using @RunWith(Cucumber.class), and I just need to instantiate the mocks before instantiating the class that uses the "real ones", which means, regular jMockit use case.

Mocking object in Cucumber step test? "JMockit wasn't properly initialized" error

1 Answers1