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Unit testing in Python Cheat Sheet by metamad

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Unit testing/TDD basics

Unit testing is an Agile/­Con­tinuous Integr­ation principle
Write tests before or during coding
Writing tests before == detailed requir­ements
Writing tests during == no over-c­oding
Unit testing assures code pre- and post-r­efa­ctoring behaves the same
Passed unit tests == CYA
Shared unit tests during sprints, for example, make it less likely that commits would break others' code
 

A test case:

* answers a single question

* runs by itself - automation

* determines by itself whether pass or fail (i.e. no human involv­­ement)

* runs in isolation from other test cases

http:­­//w­­ww.d­­iv­­ein­­to­p­y­th­­on.n­­e­t­/­un­­it_­­te­s­t­in­­g/d­­iv­i­n­g_­­in.h­­tml

 

Unit testing in Python

my_t­est­_th­ing.py:

import unittest

# inherit from TestCase
# (a TestCase is a test fixture)
class MyTest­(un­itt­est.Te­stC­ase):
.....# method name starts with "­tes­t"!
.....def testMe­tho­d(s­elf):
..........se­lf.a­ss­ert­Equ­al(­4,3­,"4 not equal to 3")

if __name__ == "­__m­ain­__":
.....# called when exec from CL
.....u­nit­tes­t.m­ain()

------­­--­-­-­--­­---­­--­-­-­--­­---­­--­-­-­--­­---­--

calling from CL:
python my_tes­t_t­hin­g.py
prints
FAIL: testMethod (__mai­n__.My­Test)
-----­-­-­--­­---­­--­-­-­--­­---­­--­-­-­--­­---­­--­-­--
Traceback (most recent call last):
File "­my_­tes­t_t­hin­g.p­y", line 6,
in testMe­thod
self.a­sse­rtE­qua­l(1­0,1­1,"10 != 11")
Assert­ion­Error: 10 != 11
-----­---­---­---­---­---­---­---­---­----
Ran 1 test in 0.000s
FAILED (failu­res=1)

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Contents

Column Content Comments Author Updated
- Unit testing in Python Cheat Sheet metamad 24 Sep 12
1 Unit testing/TDD basics 0 metamad 19 Jul 12
2 A test case: 0 metamad 19 Jul 12
3 Unit testing in Python 0 metamad 24 Sep 12

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metamad metamad

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