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Dummy objects are passed around only to fill parameter lists but never are actually used Stubs provide canned answers to calls The possibilities range from constant answers (the method always returns the same value) to matching the received value to a predefined list to decide what value to return Fake objects actually do work, but usually with some restrictions, such as using RAM for storing data instead of a database Developing these objects can be as hard as developing the actual classes themselves
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What we are dealing with, mock objects, are objects preprogrammed with expectations specifying the calls that are to be made upon them, and the values they should return For our tests, both stubs and mock objects could do as well, but in the first case we must do the verifications (was the method called What values did it receive ) by ourselves, whereas in the second case, the mock library takes care of that Just for the sake of making the difference clear, we ll use both stubs and mocks in our MVP tests
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EasyMock can construct objects for interfaces by using Java s proxy mechanism It can also work with objects through a special class extension (We are working with classes, such as Environment, so we shall at least part of the time require this extension) Because of how expectations are recorded, it s likely that refactoring your code won t affect your EasyMock based tests, which is a good advantage19 Let s test a login presenter, the last one we built before using UiBinder (UiBinder itself neither helps nor hampers our testing, because it s View-oriented, and we are testing Presenter code) We last saw this in 5; let s remember what our Presenter code looked like:
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package comfkerekimvpprojectclientlogin2; // imports public class LoginFormPresenter extends Presenter<LoginFormDisplay> { static String PLACE = "login"; LoginServiceAsync loginService; SimpleCallback<String> loginSuccessCallback;
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19 Some other similar mocking libraries (which even use a similar way for specifying expectations) are Mockito (at http://mockitoorg/) and jMock (at wwwjmockorg/ ) As usual, you makes your choices, and you takes your chances
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public LoginFormPresenter( final String params, final LoginFormDisplay loginDisplay, final Environment environment, final SimpleCallback<String> callback) { super(params, loginDisplay, environment); loginSuccessCallback = callback; loginService = getEnvironment()getModel()getRemoteLoginService(); final SimpleCallback<Object> commonBlurHandler = new SimpleCallback<Object>() { @Override public void goBack(final Object result) { final String name = LoginFormPresenterthisgetDisplay() getName(); final String pass = LoginFormPresenterthisgetDisplay() getPassword(); final boolean canLogin = !(nameisEmpty()) & !(passisEmpty()); (LoginFormPresenterthisgetDisplay()) enableLoginButton(canLogin); } }; loginDisplaysetNameBlurCallback(commonBlurHandler); loginDisplaysetPasswordBlurCallback(commonBlurHandler); loginDisplaysetName("federico"); loginDisplaysetPassword(""); commonBlurHandlergoBack(null); loginDisplaysetLoginCallback(new SimpleCallback<Object>() { @Override public void goBack(final Object result) { final String name = LoginFormPresenterthisgetDisplay() getName(); final String pass = LoginFormPresenterthisgetDisplay() getPassword(); LoginFormPresenterthisgetDisplay()enableLoginButton(false); loginServicegetSomething(name, pass, new AsyncCallback<String>() { public void onFailure(final Throwable caught) { LoginFormPresenterthisgetEnvironment()showAlert( "Failed login");
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LoginFormPresenterthisgetDisplay()enableLoginButton( true); loginSuccessCallbackonFailure(new Throwable()); } public void onSuccess(final String result) { loginSuccessCallbackgoBack(result); } }); } }); } }
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As is, our code is good for testing, because It interacts with a remote servlet to do the login but gets the needed reference by means of the provided Environment parameter rather than directly accessing an actual server It shows some alerts, but it also does it through the received Environment parameter, allowing us to check whether alerts were produced but without stopping the test waiting for user interaction It works with the View in MVP fashion, but it doesn t directly deal with widgets or handlers, rather going through the View interface Furthermore, the View is received as a parameter by the Presenter constructor, which is also good (because the actual View interacts with the DOM and with JavaScript code, which would prohibit the kind of tests we are striving for)
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