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Enrico Campidoglio
Testing the Essential
with AutoFixture
@ecampidoglio
Testing the Essential with AutoFixture Enrico Campidoglio - - PowerPoint PPT Presentation
Testing the Essential with AutoFixture Enrico Campidoglio - - PowerPoint PPT Presentation
Testing the Essential with AutoFixture Enrico Campidoglio @ecampidoglio Premise: + Small Expressive Essential 3 unit testing AutoFixture patterns Context Set() 123 System System under test under test
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Essential
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AutoFixture 3 unit testing patterns
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Context
System under test System under test 123 Set()
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Set()
123
System under test
Fixture
true
- 1
‘Bar’ 982 null
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3 parts
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Act Assert Arrange
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Act Assert Arrange
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System under test Set()
Fixture
true
- 1
982 null ‘Bar’ 123
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System under test
Fixture
Set()
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Easier to change Fewer explicit calls
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Scenario
Fixture
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Scenario
Fixture
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3 unit testing patterns
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Anonymous Data
1
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Any input value that exercises the code path under test
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public bool IsPositive(int value) { return value > 0; }
Anonymous
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Equivalence Classes
2
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The group of input values that exercise the same path through the code
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public void Fork(int value) { if (value > 3) { // Do this } else { // Do that } }
Fork(4); Fork(9); Fork(0); Fork(2);
Equivalenceclasses
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Test Data Builder
3
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A factory that creates values used to test specific code paths
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Default 80 %
Customize 20 %
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public void Fork(int value) { if (value > 9) { // Do this } else { // Do that } }
Asmallpositivenumber isgoodenough Tocovermostpossible codepaths
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An implementation of Conway’s Game of Life written in C#
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3 takeaways
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Easier maintenance
- No magic values
Less coupling
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github.com/autofixture
- stackoverflow.com/tags/autofixture
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