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#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

#+LaTeX_HEADER: \usepackage{listings}

#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,

#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{red},

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#+TITLE:     Testing and debugging

#+AUTHOR:    FOSSEE

#+EMAIL:     

#+DATE:    

#+DESCRIPTION: 

#+KEYWORDS: 

#+LANGUAGE:  en

#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t

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* Outline 

  - What software Testing is? 

  - Learn to test simple functions for their functionality.

  - Learn how to automate tests. 

  -  Need for coding style and some of the standards followed by the Python Community.

  -  Handling Errors and Exceptions.

* gcd function

  - Create gcd.py file with:

#+begin_LaTeX

\begin{lstlisting}[language=python]

  def gcd(a, b):

        if a % b == 0: 

            return b

        return gcd(b, a%b)

\end{lstlisting}

#+end_LaTeX

* Test for gcd.py

  - Edit gcd.py file

#+begin_LaTeX

\begin{lstlisting}[language=python]

  def gcd(a, b):

      if b == 0:

          return a

      return gcd(b, a%b)

  if __name__=='__main__':

      result = gcd(48, 64)

      if result != 16:

          print "Test failed"

      print "Test Passed"

\end{lstlisting}

#+end_LaTeX

* Automating tests

#+begin_LaTeX

\begin{lstlisting}[language=python]

    if __name=__='__main__':

    for line in open('numbers.txt'):

        numbers = line.split()

        x = int(numbers[0])

        y = int(numbers[1])

        result = int(numbers[2])

        if gcd(x, y) != result:

            print "Failed gcd test

                          for", x, y

\end{lstlisting}

#+end_LaTeX