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• Should use JUnit 4 syntax
• File name ends with *Test
• Should use Category annotation of type UnitTest
• Should complete in milliseconds 
• Should generally test a single class
• Typically uses white-box testing, uses Mocks/Fakes and helps guarantee internal quality (quality of code and class design)
• Follows "A Set of Unit Testing Rules" by Michael Feathers
  • A UnitTest should not do any of the following:
    • communicate with a database
    • communicate across the network
    • access the file system
    • prevent the running of other unit tests in parallel
    • require anything special in the environment (such as editing config files or running an external process)

2. IntegrationTest: a test involving inter-operation of components or subsystems.

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