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TDD, Unit Testing, & Smart Unit Tests
Jeremy Clarkwww.jeremybytes.com
TDD Description
• Failing unit test
Red
• Just enough code to pass the test
Green
• Adjust implementation
Refactor
© Jeremy Clark 2015
Conway’s Game of Life
Live Cell -> Dead
• Any live cell with fewer than two live neighbors dies, as if caused by under-population.
Live Cell -> Alive
• Any live cell with two or three live neighbors lives on to the next generation.
Live Cell -> Dead
• Any live cell with more than three live neighbors dies, as if by overcrowding.
Dead Cell -> Alive
• Any dead cell with exactly three live neighbors becomes a live cell, as if by reproduction.
© Jeremy Clark 2015
Examples
© Jeremy Clark 2015
Dies (Loneliness)
Lives (Reproduction)
Lives (Happy)
Dies (Overcrowding)
Smart Unit Tests
What is Smart Unit Tests?
• Available in Visual Studio 2015 (Preview)
• Generates tests based on existing code
• Follows all code paths to create 100% coverage
• Shows what the code *actually* does not what it is *expected* to do
Caveats
• Still in Preview
• Has some limitations
© Jeremy Clark 2015
Sample Code
© Jeremy Clark 2015
Code Path
Cell State (Alive/Dead)
Alive
Neighbors< 2
Dead
Neighbors>= 2 && <= 3
Alive
Neighbors> 3
Dead
Dead
Neighbors= 3
Alive
Neighbors!=3
Dead
© Jeremy Clark 2015
Smart Unit Tests Code Path
Cell State (Alive/Dead)
Alive
Neighbors< 2
Dead
Neighbors>= 2 && <= 3
Alive
Dead
Neighbors= 3
Alive
Neighbors!=3
Dead
Cell State= 2
Neighbors= 0
Cell State = 2
© Jeremy Clark 2015
![Test-Driven Developmentce.sharif.edu/courses/92-93/1/ce724-1/resources/root/ESE-TDD.pdf · Test-driven development (TDD)[1,2] is an incremental software development approach. It relies](https://img.dokumen.tips/doc/110x75/5ecb17a4175edb27d35fd1e9/test-driven-test-driven-development-tdd12-is-an-incremental-software-development.jpg)
