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Let's talk about testing

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(and then actually do it)

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Let's talk about testing

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(and then actually do it)

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Automated Testing - What

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  • write programs that test your programs
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  • no really, it makes sense (sometimes)
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Automated Testing - Why

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  • everyone writes bugs
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  • manual testing becomes unfeasible quickly
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  • having good tests helps when making changes
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Different Kinds of Automated Tests

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  • unit testing
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  • integration testing
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  • system testing
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  • acceptance testing
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However...

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Let's not go through each one and try to define them. Wikipedia did that already.

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Today we focus on unit testing.

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Unit Testing

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  • very focused tests for a small unit of code
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  • usually a function or a class
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  • most languages have libraries for writing them
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Structure of a Unit Test

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  1. arrange
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  2. act
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  3. assert
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A Simple Example

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+def add(a, b):
+    return a + b
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+def test_add():
+    expected = 3               # arrange
+    result = add(1, 2)         # act
+    assert result == expected  # assert
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Test-Driven Development (TDD)

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  • write the test before you write the code
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  • write only the code required to make the test pass
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  • refactor after each passing test (optional today)
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Practising TDD with Code Katas

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  • kata: Japanese for form/pattern
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  • karate students repeat the same kata over and over to perfect their technique
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Code Kata

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  • usually time-boxed to 15, 30, 60 minutes
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  • the point is to practise, not to solve the problem
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  • do not try to finish it
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  • when the time is up, delete your code and start over
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Time To Hack

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