JUnit

There's a number of approaches you can take to unit-test your WebWork actions. The simplest is to instantiate your actions, call setters then execute(). This allows you to bypass all the complicated container setup.

Taken from Petsoar:

package org.petsoar.actions.inventory;

import com.mockobjects.constraint.IsEqual;
import com.mockobjects.dynamic.C;
import com.mockobjects.dynamic.Mock;
import com.opensymphony.xwork.Action;
import junit.framework.TestCase;
import org.petsoar.pets.Pet;
import org.petsoar.pets.PetStore;

public class TestViewPet extends TestCase {
    private Mock mockPetStore;
    private ViewPet action;

    protected void setUp() throws Exception {
        mockPetStore = new Mock(PetStore.class);
        PetStore petStore = (PetStore) mockPetStore.proxy();

        action = new ViewPet();
        action.setPetStore(petStore);
    }

    public void testViewPet() throws Exception {
        Pet existingPet = new Pet();
        existingPet.setName("harry");
        existingPet.setId(1);

        Pet expectedPet = new Pet();
        expectedPet.setName("harry");
        expectedPet.setId(1);

        mockPetStore.expectAndReturn("getPet", C.args(new IsEqual(new Long(1))), existingPet);
        action.setId(1);

        String result = action.execute();

        assertEquals(Action.SUCCESS, result);
        assertEquals(expectedPet, existingPet);
        mockPetStore.verify();
    }

    public void testViewPetNoId() throws Exception {
        mockPetStore.expectAndReturn("getPet", C.ANY_ARGS, null);

        String result = action.execute();

        assertEquals(Action.ERROR, result);
        assertEquals(1, action.getActionErrors().size());
        assertEquals("Invalid pet selected.", action.getActionErrors().iterator().next());
        assertNull(action.getPet());
        mockPetStore.verify();
    }

    public void testViewPetInvalidId() throws Exception {
        action.setId(-1);
        testViewPetNoId();
    }
}

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JUnit