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Test Driven Development

Test Driven Development. George Mason University. Today’s topics. Review of Chapter 1: Testing Go over examples and questions testing in Python. Testing review. What is a bug? fault? failure? What is the goal of testing? What are the benefits of test-driven development?

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Test Driven Development

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  1. Test Driven Development George Mason University

  2. Today’s topics • Review of Chapter 1: Testing • Go over examples and questions • testing in Python

  3. Testing review • What is a bug? fault? failure? • What is the goal of testing? • What are the benefits of test-driven development? • What makes up a test case? • test input(s) • test result • What is a test suite?

  4. Input Domain Characterization • What are the partitions of the inputs? • What are the partitions for the outputs? (equilateral, isosceles, etc…) • Does order matter? (this will almost always be yes, but the order of what is important)

  5. Boundary Conditions • What are the partitions of the inputs? • What are the partitions for the outputs? (equilateral, isosceles, etc…) • Does order matter? (this will almost always be yes, but the order of what is important) • What are the boundary cases for the input partitions? • What are the boundary cases for the output partitions? • What’s the smallest input I can have? • What’s the largest input I can have?

  6. Inputs of varying number • What are the partitions of the inputs? • What are the partitions for the outputs? (equilateral, isosceles, etc…) • Does order matter? (this will almost always be yes, but the order of what is important) • What are the boundary cases for the input partitions? • What are the boundary cases for the output partitions? • What’s the smallest input I can have? • What’s the largest input I can have? • With sequences (like lists), what is the smallest size? What is the next smallest size?

  7. Examples • What examples did you have trouble with?

  8. Converting your tests to python • Python has several good resources for writing tests • However, we won’t use them this semester, because we need to know python first! • This semester, we will write test cases for all of our programming projects • Follow the instructions on the project specifications

  9. Running test cases • Tests are meant to be run automatically • Again, python has resources for testing, that unfortunately we can’t use yet • Refer to the project specifications for how to run your tests • Recall, your tests will all fail at first before you write any code – this is okay!

  10. Questions?

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