title: Run JUnit unit tests in Spring Boot application without providing datasource
body: <p>I am attempting to build a Spring Boot application, trying to stick to test driven development. My issue is that I have Spring Boot JPA included in my project but don't actually have a data source set up yet. Before adding the dependency, I was able to run my unit tests successfully. </p>
  
  <p>Now that I have added the dependency, even attempting to execute my unit tests fails because it is unable to initialize a datasource for Spring Data.</p>
  
  <p>I'm rather new to JUnit, Spring Boot and Mockito though. I want to be able to run my unit tests without actually having a datasource and instead mocking all of my repositories. </p>
  
  <p>What is the proper way to do this?</p>