● Used to test the lowest level components of a program

• Test individual functions / methods

● Can use stubs to provide supporting functionality/data needed by the function being tested, but whose execution is not critical to what is being tested.

● Should be created and run by developers as they code

• Developers can manually execute tests
• Manually, you can execute a single test, a group of tests, or the entire suite of tests
• All unit tests should pass cleanly before checking in / submitting code

● Can be executed automatically by Continuous Integration

• Runs against main development branch (checked-in code)
• Used to limit errors introduced by each code merge

● cxxtest - C/C++

● rspec - Ruby on Rails (also see: Better Specs)

● JUnit - Java

● mocha - JavaScript test framework running on Node.js

● jasmine - A competing JS test framework