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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_src python
def gcd(a, b):
if a % b == 0:
return b
return gcd(b, a%b)
#+end_src python
* Test for gcd.py
- Edit gcd.py file
#+begin_src 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_src
* Automating tests
#+begin_src 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_src
* Question 1
For the same inputs as gcd write automated tests for LCM.
* Solution 1
#+begin_src python
def gcd(a, b):
if a % b == 0:
return b
return gcd(b, a%b)
def lcm(a, b):
return (a * b) / gcd(a, b)
if __name__ == '__main__':
for line in open('lcmtestcases.txt'):
numbers = line.split()
x = int(numbers[0])
y = int(numbers[1])
result = int(numbers[2])
if lcm(x, y) != result:
print "Failed lcm test for", x, y
#+end_src
* Meaning full names
#+begin_src python
amount = 12.68
denom = 0.05
nCoins = round(amount / denom)
rAmount = nCoins * denom
#+end_src
* Code style
- Four Space Indentation
- 79 character limit on a line
- Funtions should be seperated by
blank line
- Use Docstring
- White space around operators
- l = 32 % 4
* Question 2
- Give meaningful names to the variables in following
code
- c = a / b
* Solution 2
#+begin_src python
quotient = dividend / divisor
#+end_src
* Code Snippet
#+begin_src python
while True print 'Hello world'
#+end_src
* Error
#+begin_latex
\begin{lstlisting}
while True print 'Hello world'
\end{lstlisting}
\begin{lstlisting}
File "<stdin>", line 1, in ?
while True print 'Hello world'
SyntaxError: invalid syntax
\end{lstlisting}
#+end_latex
* Code Snippet
#+begin_src python
a = raw_input("Enter a number")
try:
num = int(a)
except:
print "Wrong input ..."
#+end_src
* Using idb
#+begin_latex
\small
\begin{lstlisting}
In []: import mymodule
In []: mymodule.test()
---------------------------------------------
NameError Traceback (most recent call last)
<ipython console> in <module>()
mymodule.py in test()
1 def test():
2 total=1+1
----> 3 print spam
NameError: global name 'spam' is not defined
In []: %debug
> mymodule.py(2)test()
0 print spam
ipdb> total
2
\end{lstlisting}
#+end_latex
* Summary
- Create simple tests for a function.
- Learn to Automate tests using many predefined test cases.
- Good coding standards.
- Difference between syntax error and exception.
- Handling exception using try and except.
- Using %debug for debugging on ipython.
* Thank you!
#+begin_latex
\begin{block}{}
\begin{center}
This spoken tutorial has been produced by the
\textcolor{blue}{FOSSEE} team, which is funded by the
\end{center}
\begin{center}
\textcolor{blue}{National Mission on Education through \\
Information \& Communication Technology \\
MHRD, Govt. of India}.
\end{center}
\end{block}
#+end_latex