Unit test in a nutshell

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Unit Test in a nutshellShort presentation of a method to verify isolated units of code

About me

Agile Coach eXtreme Programming Trainer !Certified Scrum Professional >30 years of coding (and still proudly counting) !roberto.bettazzoni@agile42.com linkedin.com/in/robertobettazzoni @bettazzoni

Roberto Bettazzoni

unit test

Method to verify isolated units of code

unit test

Acceptance Criteria test

Functional test

Unit test

Unit tests are written by coders for coders

to test the code design

unit test

assert( condition )

unit test library

assert( bool condition ) assertEqual( <T> a, <T> b ) assertEqual( float a, float b, float precision) assertThrow( exceptionType, function)

unit test

Test Isolation

Run 4 tests: A, B, C, D

Test Isolation

Run 3 tests: A, B, D

Test Isolation

Run 3 tests: D, A, B

unit test library

test()

unit test library

setup() - test() - teardown()

unit test library

{ setup() {} teardown() {} !

test_method_1() test_method_2() test_method_3() }

Test Class also known as TestCase or TestFixture

unit test library

setup() - test_method_1() - teardown()

Test Class also known as TestCase or TestFixture

setup() - test_method_2() - teardown()setup() - test_method_3() - teardown()

unit test

unit test - What is a unit of code?

Classes Methods Functions

Blocks of code

Code Isolation (or Unit Isolation)

Take a guess

What makes a “good unit test”?

Take a guess

What makes a “good unit test”?

Readability

Food for thoughts

Unit test in a nutshell

Software