Unit TestingContinuous IntegrationPYUNIT AND JENKINS FRAMEWORK

PresenterRachita Agasthy

Unit Testing Goal – Isolate parts of the code, test their individual working.

Why do Unit testing?

Unit testing is a part of most of software development methodologies in use today• Agile Methodologies• Extreme Programming• Test Driven Development

Advantages and Disadvantages Advantages

Reduction in flaws – Statistics suggest 90% reduction in bugs during QA process

Repeatability – Can reuse the same tests as and when you make changes

Disadvantages

Requires approximately 30% more time at the start of the project

Written by developer, not possible to cover all the cases

Frameworks Available – GUnit(C++), JUnit(Java), PyUnit(Python), test-unit(Ruby) and so on.

Unit testing example - PyUnit

class Calculator(object):

def add(self, value1, value2):

return value1 + value2

Actual Code: Test Code:

class CalculatorUnitTest(unittest.TestCase):def setup(self):

// Code that is common to every// test in this class.myCalculator = Calculator()

def test_add(self):// Positive value additionresult = myCalculator.add(100,

20)errMsg = “Expected 120 but got

”+ resultassert result == 120, errMsg// Negative value additionresult = myCalculator.add(-10,

-20)errMsg = “Expected -30 but got

”+ resultassert result == -30, errMsg

if __name__ == "__main__":unittest.main()

Mocking in Unit Tests

class Calculator(object):

def add(self, value1, value2):

return value1 + value2

def multiply(self, value1, value2):

result_arr = []

for i in xrange(0,value2/2)

result.append(add(value1, value1)

if value2 % 2 != 0:

result = value1

for value in result_arr:

result = result + value1;

return result

Actual Code: Test Code:

class CalculatorUnitTest(unittest.TestCase):def setup(self):

// Code that is common to every// test in this class.myCalculator = Calculator()

def test_multiply(self):val1 = 10val2 = 20// Positive value multiplicationmyCalculator.add =

MagicMock(return_value = 20)result = myCalculator.multiply(val1,

val2)errMsg = “Expected 200 but got ”+

resultassert result == 200, errMsg

if __name__ == "__main__":unittest.main()

Continuous Integration Development work is integrated at a predefined time or event

Resulting work is automatically tested and built

Advantage◦ Automated Unit Testing ◦ Development errors are identified very early in the process◦ Continuous Quality Control

Usage: Extensively used in Extreme Programming

Frameworks Available – CruiseControl, Jenkins, Buildbot and so on.

Jenkins Open source Java based tool.

Basic functionality◦ Detect code changes in the code repository◦ Build different parts of the code◦ Run unit tests◦ Run the different components of the system◦ Verify the output◦ In case of failures, notify the developer who caused the failure.◦ Also notify other developers

Requirements◦ Requires installation on the server◦ Accessible through a web page

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