EasyMock Capture Example

Thursday, September 2nd, 2010


EasyMock version 2.4 introduced some new functionality – the ability to capture the arguments passed to mock objects. As ever a few lines of code speaks volumes.

Capture Example

Test Class

package foo.bar;

import static org.junit.Assert.assertEquals;

import org.easymock.Capture;
import org.easymock.EasyMock;
import org.easymock.IMocksControl;
import org.junit.Before;
import org.junit.Test;

public class TestServiceImpl {
    private Service service;
    private Dao dao;
    private IMocksControl controller;
    private final String description = "description";

    public void setUp() throws Exception {
        controller = EasyMock.createStrictControl();
        dao = controller.createMock(Dao.class);
        service = new ServiceImpl();  
    public void testSave() {
        Capture <DomainObject> capturedArgument = new Capture <DomainObject>();
        dao.save(EasyMock.and(EasyMock.capture(capturedArgument), EasyMock.isA(DomainObject.class)));
        DomainObject record = capturedArgument.getValue();
        assertEquals(description, record.getDescription());
        assertEquals("getNextId", record.getId());

Source code for classes under test after the break…….

Service Interface

package foo.bar;

public interface Service {
    void save(String description);
    void setDao(Dao dao);

Service Implementation

package foo.bar;

public class ServiceImpl implements Service {
    private Dao dao;
    public void save(String description) {
        DomainObject record = new DomainObject();
    public void setDao(Dao dao) {
        this.dao = dao;

Dao Interface

package foo.bar;

public interface Dao {
    public abstract void save(DomainObject record);

Dao Implementation

package foo.bar;

public class DaoImpl implements Dao {
    public void save(DomainObject record) {
        // do something

Domain Object (Bean)

package foo.bar;

public class DomainObject {
    private String id;
    private String description;
    public String getDescription() {
        return description;
    public void setDescription(String description) {
        this.description = description;
    public String getId() {
        return id;
    public void setId(String id) {
        this.id = id;

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