Checking the results of a Factory in a unit test

Question

I have developed some classes with similar behavior, they all implement the same interface. I implemented a factory that creates the appropriate object and returns the inte

Answer 1

If your Factory returns a concrete instance you can use the @Parameters annotation in order to obtain a more flexible automatic unit test.

package it.sorintlab.pxrm.proposition.model.factory.task;

import org.junit.Test;

import java.util.Arrays;
import java.util.Collection;

import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import static org.junit.Assert.*;

@RunWith(Parameterized.class)
public class TaskFactoryTest {

    @Parameters
    public static Collection data() {
        return Arrays.asList(new Object[][] {
                { "sas:wp|repe" , WorkPackageAvailabilityFactory.class},
                { "sas:wp|people", WorkPackagePeopleFactory.class},
                { "edu:wp|course", WorkPackageCourseFactory.class},
                { "edu:wp|module", WorkPackageModuleFactory.class},
                { "else", AttachmentTaskDetailFactory.class}
        });
    }

    private String fInput;
    private Class fExpected;

    public TaskFactoryTest(String input, Class expected) {
        this.fInput = input;
        this.fExpected = expected;
    }

    @Test
    public void getFactory() {
        assertEquals(fExpected, TaskFactory.getFactory(fInput).getClass());
    }
}

This example is made using Junit4. You can notice that with only one line of code you can test all the result of your Factory method.