Adding Mockito dependency to your project is pretty simple.

Simply add the dependencies below to your pom.xml.

NOTE: You will need JUnit version 4.4 or earlier. I couldn't get Mockito to work with higher JUnit versions. Also, I did not try any prior version than Junit 4.4.

<dependency>
    <groupid>org.mockito</groupid>
    <artifactid>mockito-all</artifactid>
    <version>1.8.5</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupid>junit</groupid>
    <artifactid>junit</artifactid>
    <version>4.4</version>
    <scope>test</scope>
</dependency>

Update: I got Mockito 1.8.5 to work with JUnit 4.7. Not sure what changed.