1 % Created 2010-11-12 Fri 02:00

     2 \documentclass[presentation]{beamer}

     3 \usepackage[latin1]{inputenc}

     4 \usepackage[T1]{fontenc}

     5 \usepackage{fixltx2e}

     6 \usepackage{graphicx}

     7 \usepackage{longtable}

     8 \usepackage{float}

     9 \usepackage{wrapfig}

    10 \usepackage{soul}

    11 \usepackage{t1enc}

    12 \usepackage{textcomp}

    13 \usepackage{marvosym}

    14 \usepackage{wasysym}

    15 \usepackage{latexsym}

    16 \usepackage{amssymb}

    17 \usepackage{hyperref}

    18 \tolerance=1000

    19 \usepackage[english]{babel} \usepackage{ae,aecompl}

    20 \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}

    21 \usepackage{listings}

    22 \lstset{language=Python, basicstyle=\ttfamily\bfseries,

    23 commentstyle=\color{red}\itshape, stringstyle=\color{red},

    24 showstringspaces=false, keywordstyle=\color{blue}\bfseries}

    25 \providecommand{\alert}[1]{\textbf{#1}}

    26 

    27 \title{Testing and debugging}

    28 \author{FOSSEE}

    29 \date{}

    30 

    31 \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}

    32 \begin{document}

    33 

    34 \maketitle

    35 

    36 

    37 

    38 

    39 

    40 

    41 

    42 

    43 

    44 \begin{frame}

    45 \frametitle{Outline}

    46 \label{sec-1}

    47 

    48 \begin{itemize}

    49 \item What software Testing is?

    50 \item Learn to test simple functions for their functionality.

    51 \item Learn how to automate tests.

    52 \item Need for coding style and some of the standards followed by the Python Community.

    53 \item Handling Errors and Exceptions.

    54 \end{itemize}

    55 \end{frame}

    56 \begin{frame}[fragile]

    57 \frametitle{gcd function}

    58 \label{sec-2}

    59 

    60 \begin{itemize}

    61 \item Create gcd.py file with:

    62 \end{itemize}

    63 

    64 \begin{verbatim}

    65 def gcd(a, b):

    66       if a % b == 0: 

    67           return b

    68       return gcd(b, a%b)

    69 \end{verbatim}

    70 \end{frame}

    71 \begin{frame}[fragile]

    72 \frametitle{Test for gcd.py}

    73 \label{sec-3}

    74 

    75 \begin{itemize}

    76 \item Edit gcd.py file

    77 \end{itemize}

    78 

    79 \begin{verbatim}

    80 def gcd(a, b):

    81     if b == 0:

    82         return a

    83     return gcd(b, a%b)

    84 

    85 if __name__=='__main__':

    86     result = gcd(48, 64)

    87     if result != 16:

    88         print "Test failed"

    89     print "Test Passed"

    90 \end{verbatim}

    91 \end{frame}

    92 \begin{frame}[fragile]

    93 \frametitle{Automating tests}

    94 \label{sec-4}

    95 

    96 \begin{verbatim}

    97 if __name=__='__main__':

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

    99     numbers = line.split()

   100     x = int(numbers[0])

   101     y = int(numbers[1])

   102     result = int(numbers[2])

   103     if gcd(x, y) != result:

   104         print "Failed gcd test

   105                       for", x, y

   106 \end{verbatim}

   107 \end{frame}

   108 \begin{frame}

   109 \frametitle{Question 1}

   110 \label{sec-5}

   111 

   112   For the same inputs as gcd write automated tests for LCM.

   113 \end{frame}

   114 \begin{frame}[fragile]

   115 \frametitle{Solution 1}

   116 \label{sec-6}

   117 

   118 \begin{verbatim}

   119 def gcd(a, b):

   120       if a % b == 0: 

   121           return b

   122       return gcd(b, a%b)

   123 

   124  def lcm(a, b):

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

   126 

   127   if __name__ == '__main__':

   128     for line in open('lcmtestcases.txt'):

   129       numbers = line.split()

   130       x = int(numbers[0])

   131       y = int(numbers[1])

   132       result = int(numbers[2])

   133       if lcm(x, y) != result:

   134           print "Failed lcm test for", x, y

   135 \end{verbatim}

   136 \end{frame}

   137 \begin{frame}[fragile]

   138 \frametitle{Meaning full names}

   139 \label{sec-7}

   140 

   141 \begin{verbatim}

   142 

   143 amount = 12.68

   144 denom = 0.05

   145 nCoins = round(amount / denom)

   146 rAmount = nCoins * denom

   147 \end{verbatim}

   148 \end{frame}

   149 \begin{frame}

   150 \frametitle{Code style}

   151 \label{sec-8}

   152 

   153 \begin{itemize}

   154 \item Four Space Indentation

   155 \item 79 character limit on a line

   156 \item Funtions should be seperated by 

   157    blank line

   158 \item Use Docstring

   159 \item White space around operators

   160 

   161 \begin{itemize}

   162 \item l = 32 \% 4

   163 \end{itemize}

   164 

   165 \end{itemize}

   166 \end{frame}

   167 \begin{frame}

   168 \frametitle{Question 2}

   169 \label{sec-9}

   170 

   171 \begin{itemize}

   172 \item Give meaningful names to the variables in following

   173      code

   174 

   175 \begin{itemize}

   176 \item c = a / b

   177 \end{itemize}

   178 

   179 \end{itemize}

   180 \end{frame}

   181 \begin{frame}[fragile]

   182 \frametitle{Solution 2}

   183 \label{sec-10}

   184 

   185 \begin{verbatim}

   186 

   187 quotient = dividend / divisor

   188 \end{verbatim}

   189 \end{frame}

   190 \begin{frame}[fragile]

   191 \frametitle{Code Snippet}

   192 \label{sec-11}

   193 

   194 \begin{verbatim}

   195 

   196 while True print 'Hello world'

   197 \end{verbatim}

   198 \end{frame}

   199 \begin{frame}[fragile]

   200 \frametitle{Error}

   201 \label{sec-12}

   202 

   203 \begin{lstlisting}

   204  while True print 'Hello world'

   205  \end{lstlisting}

   206   \begin{lstlisting}

   207   File "<stdin>", line 1, in ?

   208     while True print 'Hello world'

   209 SyntaxError: invalid syntax

   210 \end{lstlisting}

   211 \end{frame}

   212 \begin{frame}[fragile]

   213 \frametitle{Code Snippet}

   214 \label{sec-13}

   215 

   216 \begin{verbatim}

   217 a = raw_input("Enter a number")

   218 try:

   219       num = int(a)

   220  except:

   221       print "Wrong input ..."

   222 \end{verbatim}

   223 \end{frame}

   224 \begin{frame}[fragile]

   225 \frametitle{Using idb}

   226 \label{sec-14}

   227 

   228 \small

   229 \begin{lstlisting}

   230 In []: import mymodule

   231 In []: mymodule.test()

   232 ---------------------------------------------

   233 NameError   Traceback (most recent call last)

   234 <ipython console> in <module>()

   235 mymodule.py in test()

   236       1 def test():

   237       2     total=1+1

   238 ----> 3     print spam

   239 NameError: global name 'spam' is not defined

   240 

   241 In []: %debug

   242 > mymodule.py(2)test()

   243       0     print spam

   244 ipdb> total

   245 2

   246 \end{lstlisting}

   247 \end{frame}

   248 \begin{frame}

   249 \frametitle{Summary}

   250 \label{sec-15}

   251 

   252 \begin{itemize}

   253 \item Create simple tests for a function.

   254 \item Learn to Automate tests using many predefined test cases.

   255 \item Good coding standards.

   256 \item Difference between syntax error and exception.

   257 \item Handling exception using try and except.

   258 \item Using \%debug for debugging on ipython.

   259 \end{itemize}

   260 \end{frame}

   261 \begin{frame}

   262 \frametitle{Thank you!}

   263 \label{sec-16}

   264 

   265   \begin{block}{}

   266   \begin{center}

   267   This spoken tutorial has been produced by the

   268   \textcolor{blue}{FOSSEE} team, which is funded by the 

   269   \end{center}

   270   \begin{center}

   271     \textcolor{blue}{National Mission on Education through \\

   272       Information \& Communication Technology \\ 

   273       MHRD, Govt. of India}.

   274   \end{center}  

   275   \end{block}

   276 \end{frame}

   277 

   278 \end{document}