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    <p>You have three options to set your mock dao:</p> <ol> <li><strong>Test the implementation</strong> - which gives a seam for your mock via the setDao method. (as JB's answer) </li> <li><strong>Add the setDao method</strong> to the interface - not desired since you don't want to add code just to support your tests.</li> <li><strong>Add a constructor</strong> to the impl class to accept the dao - not desired for same reason as #2.</li> </ol> <p>If you wanted to do #3, you'll need to add a constructor to the MobileService that accepts the MobileDao.</p> <pre><code> public MobileServiceImpl(MobileDao mobileDao) { this.mobileDao = mobileDao; } </code></pre> <hr> <p>Then your test will look like this:</p> <pre><code>import static org.mockito.Mockito.verify; import static org.mockito.Mockito.*; import java.util.Date; import org.junit.Before; import org.junit.Test; public class MobileServiceImplTest { private MobileService systemUnderTest; private MobileDao mobileDao; @Before public void setup() { mobileDao = mock(MobileDao.class); systemUnderTest = new MobileServiceImpl(mobileDao); } @Test public void testGetUser() { //if you need to, configure mock behavior here. //i.e. when(mobileDao.someMethod(someObject)).thenReturn(someResponse); systemUnderTest.getUser("accessCode", new Date()); verify(mobileDao).getUser("JeffAtwood"); } } </code></pre> <p>Please note that you have not provided us with the details of the MobileDao so I created a getUser method that accepts a String.</p> <p>To make the test pass, your MobileServiceImpl would just need this:</p> <pre><code>mobileDao.getUser("JeffAtwood"); </code></pre>
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    1. POSpring + Mockito test injection
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    1. USTony R
    1. USTony R
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    1. COJust like adding a `setMobileDao` to the interface, adding another ctor to pass in the DAO object would be altering code to support unit tests. As per @jb-nizet 's answer, if I alter my test to not use the interface but rather the implementation, then I already have access to the `setMobileDao` method.
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    2. COUnderstood that you don't want to add anything to the code just to support tests. Testing the impl instead of the interface is something that I've done in the past as well ;) Just wanted to give another option.
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