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Object-Oriented Programming

&

Test-Driven Development

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Preview: why talk about these together?

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OOP is about self-contained "widgets"

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TDD is about writing tests then code.

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How do you think they fit together?

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Syntax for objects in various languages

Java / Scala, C, C++, R, Perl, Javascript

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What do these common features tell us?

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Notable similarities?

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Types

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Scope

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Inheritance

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What are their benefits?

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Interlude: Object Exercises

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Test Driven Development

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initially, all tests fail, so...

code until each passes

testMethod1(testInput1) == desiredOutput1

testMethod2(testInput2) == desiredOutput2

...

testMethodN(testInputN) == desiredOutputN

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Test Driven Development

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More details

- testing language features, OSS libraries?

- work incrementally

- what's worth testing?

- trade off test development vs. product development

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Some Testing frameworks

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JUnit, ScalaTest, Perl tests,

Check, Google Test, etc

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Why testing?

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What else would we want to "test" that hasn't been discussed so far?

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What are hurdles to doing testing?

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Review:

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How might OOP & TDD work together?

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What needs to be tested in your projects?