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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Tips for writing a test program (Ruby / Python / Java)

Where does my test code go?

If you've written a class - a series of methods to be used within another application - how do you test it? How about writing a test program within the same file which runs as the main program if you run your class on its own from the command line, but is ignored if you import / require your class from a higher level application.

In Ruby write your test code within the following condition:

if __FILE__ == $0

In Python, the condition should be written as follows:

if __name__ == "__main__":

And in Java, you can provide a main method in the class.

public static void main (String [] args) {

What goes in my test code?

I suggest that you create at least TWO instances of an object of the type that the class(es) in the file implement, putting fixed values for demonstration purposed in the file if you can so that the test isn't reliant on external data.

Put unique values into each object to that they can clearly seen to be different, and avoid "1"s which won't cause any change if you multiply by them, also avoid 0s, and giving sequences like 1,2,3,4,5 which won't flag up any errors if you use an index number rather than a value by mistake anywhere.

Having created two objects, use a service of methods to set and get attributes, building in tests of the functionality that your users need, and allowing you the chance to see what the interface to your code's going to look like from a user's viewpoint - in fact it's a good idea to write the tst code early.

Some languages have assert statments or whole test harness structures to let you write code which validates its own responses; use them as appropriate. In other cases, print out the results and also say what the results should be so that the tester / user KNOWS whether it has worked, and obviously, from running it.

What does the test code provide

A piece of code for YOU to test your class is functioning and complete when you have written it

A piece of code for you to test that you class is still functioning when you have modified it

A piece of code that lets your users check that your code is working AND that all dependencies have been met when they install or update it

A piece of code that helps you specify the API to your class

A piece of code that illustrates to your users how they may / should call the API that you have provided ... if you do it well / comment it well, it can form a basis of your documentation.

Examples

There is an example of a test harness in Ruby [here] (and that example, which shows you how the main OO features are implemented in Ruby is more fully dosumented [here].

There's a good Python example [here].
(written 2010-01-29, updated 2010-01-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y116 - Python - Applying OO design techniques and best practise
  [340] Code and code maintainance efficiency - (2005-06-08)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [668] Python - block insets help with documentation - (2006-04-04)
  [836] Build on what you already have with OO - (2006-08-17)
  [945] Code quality counts - (2006-11-26)
  [1181] Good Programming practise - where to initialise variables - (2007-05-09)
  [2363] Alpaca Case or Camel Case - (2009-08-16)
  [2407] Testing code in Python - doctest, unittest and others - (2009-09-16)
  [2485] How do I set up a constant in Python? - (2009-10-31)
  [2523] Plan your application before you start - (2009-12-02)
  [3887] Inheritance, Composition and Associated objects - when to use which - Python example - (2012-10-10)
  [4028] Really Simple Class and Inheritance example in Python - (2013-03-04)
  [4118] We not only teach PHP and Python - we teach good PHP and Python Practice! - (2013-06-18)
  [4359] How to avoid too many recalculations within an object - (2014-12-21)
  [4718] Defining an object that is a modified standard type in Python - (2016-11-02)

Y106 - Object Oriented Python
  [477] Class, static and unbound variables - (2005-10-25)
  [834] Python makes University Challenge - (2006-08-15)
  [900] Python - function v method - (2006-10-20)
  [1306] Python class rattling around - (2007-08-16)
  [1348] Screw it or Glue it? Access to Object variables - a warning - (2007-09-12)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [2017] Python - a truly dynamic language - (2009-01-30)
  [2169] When should I use OO techniques? - (2009-05-11)
  [3085] Object Oriented Programming for Structured Programmers - conversion training - (2010-12-14)
  [3399] From fish, loaves and apples to money, plastic cards and BACS (Perl references explained) - (2011-08-20)
  [3436] Moving from scripting to Object Orientation in Python - (2011-09-13)
  [3673] Object oriented or structured - a comparison in Python. Also writing clean regular expressions - (2012-03-26)
  [3878] From Structured to Object Oriented Programming. - (2012-10-02)
  [3947] this or self - what are they, and what is the difference? (Python) - (2012-12-08)
  [4021] Spike solution, refactored and reusable, Python - Example - (2013-02-28)
  [4129] Simple OO demonstration in C++, comparison to Python - (2013-07-01)
  [4448] What is the difference between a function and a method? - (2015-03-04)
  [4591] From single block to structure and object oriented programming - (2015-12-02)
  [4650] Why populate object with values as you construct them? - (2016-02-18)
  [4721] When to check an object type - Python isinstance example - (2016-11-03)

R116 - Ruby - Security Issues.
  [3781] Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23)

R108 - Ruby - More Classes and Objects
  [184] MTBF of coffee machines - (2005-01-20)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [2292] Object Orientation in Ruby - intermediate examples - (2009-07-16)
  [2601] Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27)
  [2603] Ruby objects - a primer - (2010-01-29)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02)
  [2623] Object Oriented Ruby - new examples - (2010-02-03)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30)
  [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02)
  [3142] Private and Public - and things between - (2011-01-22)
  [3154] Changing a class later on - Ruby - (2011-02-02)
  [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05)
  [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23)
  [3760] Why you should use objects even for short data manipulation programs in Ruby - (2012-06-10)
  [3782] Standard methods available on all objects in Ruby - (2012-06-23)
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)
  [4550] Build up classes into applications sharing data types in Ruby - (2015-10-23)
  [4551] Testing your new class - first steps with cucumber - (2015-10-23)

J710 - Java - Extending Classes and More
  [831] Comparison of Object Oriented Philosophy - Python, Java, C++, Perl - (2006-08-13)
  [1066] Final, Finally and Finalize - three special words in Java - (2007-02-05)
  [1294] An example of Java Inheritance from scratch - (2007-08-00)
  [1501] Java - using super to call a method in the parent class - (2008-01-10)
  [1538] Teaching Object Oriented Java with Students and Ice Cream - (2008-02-12)
  [1556] Java - a demonstration of inheritance on just one page - (2008-02-26)
  [1819] Calling base class constructors - (2008-10-03)
  [2185] Abstract Classes - Java - (2009-05-16)
  [2434] Abstract classes, Interfaces, PHP and Java - (2009-10-03)
  [2860] What methods are available on this Java object? - (2010-07-08)
  [3047] What is a universal superclass? Java / Perl / Python / Other OO languages - (2010-11-13)
  [4334] Splitting out code into name blocks for clarity and reusability - (2014-11-30)
  [4394] Philosophy behind object design - and how I applied in to a Java example - (2015-01-14)
  [4419] Java Inheritance example - group of classes - step by step - (2015-02-08)
  [4422] Objects - from physical to virtual or abstract - Java - (2015-02-10)

J608 - Java - Naming Conventions and Code Management
  [2415] Variable names like i and j - why? - (2009-09-22)


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