1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     2 % Tutorial slides on Python.

     3 %

     4 % Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in>

     5 % Copyright (c) 2005-2009, Prabhu Ramachandran

     6 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

     7 

     8 \documentclass[compress,14pt]{beamer}

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    40 

    41 % Taken from Fernando's slides.

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    57 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    58 % My Macros

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    94 

    95 

    96 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    97 % Title page

    98 \title[]{Test Driven Approach}

    99 

   100 \author[FOSSEE Team] {Asokan Pichai\\Prabhu Ramachandran}

   101 

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

   103 \date[] {11, October 2009}

   104 \date[] % (optional)

   105 }

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   111 \AtBeginSection[]

   112 {

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   114     \frametitle{Outline}

   115       \Large

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   117   \end{frame}

   118 }

   119 

   120 %% Delete this, if you do not want the table of contents to pop up at

   121 %% the beginning of each subsection:

   122 \AtBeginSubsection[]

   123 {

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   130 \AtBeginSection[]

   131 {

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   133     \frametitle{Outline}

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   136 }

   137 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

   138 % DOCUMENT STARTS

   139 \begin{document}

   140 

   141 \begin{frame}

   142   \maketitle

   143 \end{frame}

   144 

   145 \section{Test Driven Approach}

   146 

   147 \begin{frame}

   148     \frametitle{Testing code with \typ{nosetests}}

   149    

   150     \begin{itemize}

   151         \item Writing tests is really simple!

   152 

   153         \item Using nose.

   154 

   155         \item Example!

   156     \end{itemize}

   157 \end{frame}

   158 

   159 \begin{frame}

   160     \frametitle{Need of Testing!}

   161    

   162     \begin{itemize}

   163         \item Quality

   164 

   165         \item Regression

   166 

   167         \item Documentation

   168     \end{itemize}

   169 \end{frame}

   170 

   171 \begin{frame}[fragile]

   172     \frametitle{Nosetest}

   173   \begin{lstlisting}

   174 def gcd(a, b):

   175     """Returns gcd of a and b, 

   176      handles only positive numbers."""

   177     if a%b == 0: return b

   178     return gcd(b, a%b)

   179 def lcm(a, b):

   180     return a*b/gcd(a, b)

   181 

   182 if __name__ == '__main__':

   183     import nose

   184     nose.main()

   185   \end{lstlisting}

   186 \inctime{10}

   187 \end{frame}

   188 

   189 \begin{frame}[fragile]

   190     \frametitle{Example}

   191     \begin{block}{Problem Statement:}

   192       Write a function to check whether a given input

   193       string is a palindrome.

   194     \end{block}

   195 \end{frame}

   196 

   197 \begin{frame}[fragile]

   198     \frametitle{Function: palindrome.py}

   199 \begin{lstlisting}    

   200 def is_palindrome(input_str):

   201   return input_str == input_str[::-1]

   202 \end{lstlisting}    

   203 \end{frame}

   204 

   205 \begin{frame}[fragile]

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

   207 \begin{lstlisting}    

   208 from plaindrome import is_palindrome

   209 def test_function_normal_words():

   210   input = "noon"

   211   assert is_palindrome(input) == True

   212 \end{lstlisting}    

   213 \end{frame}

   214 

   215 \begin{frame}[fragile]

   216     \frametitle{Running the tests.}

   217 \begin{lstlisting}    

   218 $ nosetests test.py 

   219 .

   220 ----------------------------------------------

   221 Ran 1 test in 0.001s

   222 

   223 OK

   224 \end{lstlisting}    

   225 \end{frame}

   226 

   227 \begin{frame}[fragile]

   228     \frametitle{Exercise: Including new tests.}

   229 \begin{lstlisting}    

   230 def test_function_ignore_cases_words():

   231   input = "Noon"

   232   assert is_palindrome(input) == True

   233 \end{lstlisting}

   234      \vspace*{0.25in}

   235      Check\\

   236      \PythonCode{$ nosetests test.py} \\

   237      \begin{block}{Task}

   238      Tweak the code to pass this test.

   239      \end{block}

   240 \end{frame}

   241 

   242 %\begin{frame}[fragile]

   243 %    \frametitle{Lets write some test!}

   244 %\begin{lstlisting}    

   245 %#for form of equation y=mx+c

   246 %#given m and c for two equation,

   247 %#finding the intersection point.

   248 %def intersect(m1,c1,m2,c2):

   249 %    x = (c2-c1)/(m1-m2)

   250 %    y = m1*x+c1

   251 %    return (x,y)

   252 %\end{lstlisting}

   253 %

   254 %Create a simple test for this

   255 %

   256 %function which will make it fail.

   257 %

   258 %\inctime{15} 

   259 %\end{frame}

   260 %

   261 

   262 \begin{frame}[fragile]

   263     \frametitle{Exercise}

   264     Based on Euclid's theorem:

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

   266     gcd function can be written as:

   267     \begin{lstlisting}

   268     def gcd(a, b):

   269       if a%b == 0: return b

   270       return gcd(b, a%b)

   271     \end{lstlisting}

   272     \begin{block}{Task}

   273       For given gcd implementation write

   274       at least two tests.

   275     \end{block}

   276     \begin{block}{Task}

   277       Write a non recursive implementation

   278       of gcd(), and test it using already 

   279       written tests.

   280     \end{block}

   281     

   282 \inctime{15} 

   283 \end{frame}

   284 

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

   286   \begin{itemize}

   287     \item Need for visualization.

   288     \item Tools available.

   289     \item How to follow Test Driven Approach.

   290   \end{itemize}

   291 \end{frame}

   292 \begin{frame}

   293     \begin{center}

   294         \Huge    

   295         Thank you!

   296     \end{center}

   297 \end{frame}

   298 

   299 \end{document}