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% Tutorial slides on Python.

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% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>

% Copyright (c) 2005-2009, Prabhu Ramachandran

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\title[]{Test Driven Approach}

\author[FOSSEE Team] {FOSSEE}

\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay}

\date[] {11, October 2009}

\date[] % (optional)

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\begin{document}

\begin{frame}

  \maketitle

\end{frame}

\section{Test Driven Approach}

\begin{frame}

    \frametitle{Testing code with nosetests}

    \begin{itemize}

        \item Writing tests is really simple!

        \item Using nose.

        \item Example!

    \end{itemize}

\end{frame}

\begin{frame}

    \frametitle{Need of Testing!}

    \begin{itemize}

        \item Quality

        \item Regression

        \item Documentation

    \end{itemize}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Nosetest}

  \begin{lstlisting}

def gcd(a, b):

    """Returns gcd of a and b, 

     handles only positive numbers."""

    if a%b == 0: return b

    return gcd(b, a%b)

def lcm(a, b):

    return a*b/gcd(a, b)

if __name__ == '__main__':

    import nose

    nose.main()

  \end{lstlisting}

\inctime{10}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Example}

    \begin{block}{Problem Statement:}

      Write a function to check whether a given input

      string is a palindrome.

    \end{block}

\end{frame}

\begin{frame}[fragile]

    \frametitle{Function: palindrome.py}

\begin{lstlisting}    

def is_palindrome(input_str):

  return input_str == input_str[::-1]

\end{lstlisting}    

\end{frame}

\begin{frame}[fragile]

    \frametitle{Test for the palindrome: palindrome.py}

\begin{lstlisting}    

from plaindrome import is_palindrome

def test_function_normal_words():

  input = "noon"

  assert is_palindrome(input) == True

\end{lstlisting}    

\end{frame}

\begin{frame}[fragile]

    \frametitle{Running the tests.}

\begin{lstlisting}    

$ nosetests test.py 

.

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

Ran 1 test in 0.001s

OK

\end{lstlisting}    

\end{frame}

\begin{frame}[fragile]

    \frametitle{Exercise: Including new tests.}

\begin{lstlisting}    

def test_function_ignore_cases_words():

  input = "Noon"

  assert is_palindrome(input) == True

\end{lstlisting}

     \vspace*{0.25in}

     Check\\

     \PythonCode{$ nosetests test.py} \\

     \begin{block}{Task}

     Tweak the code to pass this test.

     \end{block}

\end{frame}

%\begin{frame}[fragile]

%    \frametitle{Lets write some test!}

%\begin{lstlisting}    

%#for form of equation y=mx+c

%#given m and c for two equation,

%#finding the intersection point.

%def intersect(m1,c1,m2,c2):

%    x = (c2-c1)/(m1-m2)

%    y = m1*x+c1

%    return (x,y)

%\end{lstlisting}

%

%Create a simple test for this

%

%function which will make it fail.

%

%\inctime{15} 

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\begin{frame}[fragile]

    \frametitle{Exercise}

    Based on Euclid's algorithm:

        $gcd(a,b)=gcd(b,b\%a)$\\

    gcd function can be written as:

    \begin{lstlisting}

    def gcd(a, b):

      if a%b == 0: return b

      return gcd(b, a%b)

    \end{lstlisting}

    \vspace*{-0.15in}

    \begin{block}{Task}

      \begin{itemize}

      \item Write at least 

        two tests for above mentioned function.

      \item Write a non recursive implementation

      of gcd(), and test it using already 

      written tests.

      \end{itemize}

    \end{block}

\inctime{15} 

\end{frame}

\begin{frame}{In this session we have covered:}

  \begin{itemize}

    \item Need for visualization.

    \item Tools available.

    \item How to follow Test Driven Approach.

  \end{itemize}

\end{frame}

\begin{frame}

    \begin{center}

        \Huge    

        Thank you!

    \end{center}

\end{frame}

\end{document}