Posts Tagged ‘tdd’

TDD is too good of a tool

March 18th, 2009

Some people started attacks against a few TDD proponents, namely Kent Beck and Bob Martin. This is not the first time and it won’t be the last time. What these bloggers don’t get is that TDD is not presented as the silver bullet by anybody serious about programming (and yes, Kent Beck and Bob Martin are serious about programming). Read more…

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JUnit Max just rocks!

February 25th, 2009

JUnit Max is an Eclipse plug’in developped by Kent Beck himself. After a few days testing it on a medium size project every day, I can tell you that it just rocks!
Read more…

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Automatic mock creation with JUnit & Mockito

February 19th, 2009

Mockito is really a great mocking framework. It is based on a powerful stubbing and verification mecanism. Using it is as simple as this:

 import static org.mockito.Mockito.*;

 List mockedList = mock(List.class);



A handy tool provided by Mockito is a custom JUnit runner that automatically creates mock for fields tagged with @Mock annotation:

public class ArticleManagerTest {
    @Mock private ArticleCalculator calculator;
    @Mock private ArticleDatabase database;
    @Mock private UserProvider userProvider;

    private ArticleManager manager;

In our team, we came up with an even simpler solution. All mock names should start with mock to ease test code readability. So we coded a custom Runner that doesn’t need the @Mock annotation.

public class ArticleManagerTest {
    private ArticleCalculator mockCalculator;
    private ArticleDatabase mockDatabase;
    private UserProvider mockUserProvider;

    private ArticleManager manager;

Here is the runner implementation:

public class AutoMockRunner extends BlockJUnit4ClassRunner {
  public AutoMockRunner(Class< ?> clazz) throws InitializationError {

  protected Object createTest() throws Exception {
    Object clazz = super.createTest();

    for (Class< ?> c = clazz.getClass(); c != Object.class; c = clazz.getSuperclass()) {
      scan(testClass, c);

    return clazz;

  private static void scan(Object testClass, Class< ?> clazz) {
    for (Field field : clazz.getDeclaredFields()) {
      if (field.getName().startsWith("mock")) {
        Object mock = Mockito.mock(field.getType(), field.getName());

        try {
          if (field.isAccessible()) {
            field.set(testClass, mock);
          } else {
            try {
              field.set(testClass, mock);
            } finally {
        } catch (IllegalAccessException e) {

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