jMock "unexpected invocation" for a method that I have a oneOf(instance).method() expected

Question

I can't seem to figure out what I'm doing wrong here:

This is the method I'm testing:

public List<Mo> filterDuplicatesByName(List<Mo> dbMos) {
    List<String> names = Lists.newArrayList();
    for(Mo mo : dbMos) {
        try {
            String name = mo.getName();
            if(names.contains(name)) {
                dbMos.remove(mo);
            } else {
                names.add(name);
            }
        } catch (DataLayerException ex) {
            dbMos.remove(mo);
        }
    }
    return dbMos;
}

And this is my test class:

package com.rondavu.wt.service.recommendations;

import com.google.common.collect.Lists;
import com.rondavu.data.api.Mo;
import org.jmock.Expectations;
import org.jmock.Mockery;
import org.jmock.lib.legacy.ClassImposteriser;
import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertEquals;

public class RecommendationsUtilsTest  {

    Mockery context = new Mockery();

    RecommendationsUtils recommendationsUtils = new RecommendationsUtils();

    final Mo mo = context.mock(Mo.class);

    @Test
    public void testFilterDuplicatesByName_oneMo() throws DataLayerException {
        List<Mo> input = Lists.newArrayList(mo);
        List<Mo> expected = Lists.newArrayList(mo);

        context.checking(new Expectations() {{
            oneOf (mo).getName(); will(returnValue("Mo 1"));
        }});

        List<Mo> actual = recommendationsUtils.filterDuplicatesByName(input);

        context.assertIsSatisfied();

        assertEquals(expected, actual);
    }
}

When I run the test I get this output:

unexpected invocation: mo.getName()
no expectations specified: did you...
 - forget to start an expectation with a cardinality clause?
 - call a mocked method to specify the parameter of an expectation?
what happened before this: nothing!
    [stack trace]

I'm pretty new to jMock, and Java is not my strongest language in general but I thought that my oneOf (mo).getName() would make it expect that invocation. What am I doing wrong here?

Answer 1

Though it's not clear why at this point, it seems like Mockery is checking a different instance of mo compared to the one you're defining the expectations to. Try inserting context.mock(Mo.class) in the same local scope as the test case (or in an @Before method) and see if that fixes things.