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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Testing your new class - first steps with cucumber

A recent article ([here]) showed you how we build up a series of classes, each with their own piece of test code, into applications.

It's all very well putting a piece of test code in the bottom of our class definition file - and that's a useful thing to do - but it's just a single test, and it doesn't provide for a management system for tests, nor for regression testing where new tests are added to a suite as more code gets added to the class. That's where cucumber comes in - and we have a whole separate module on that - see [here].

Using cucumber, we describe a behaviour in a feature file (using the gherkin language):

  Feature: Checking we know station names
  
  Scenario:
  When we ask for the full name for "MKM"
  Then we are told it is "Melksham"
  
  Scenario:
  When we ask for the full name for "PLY"
  Then we are told it is "Plymouth"
  
  Scenario:
  When we ask for the full name for "OXF"
  Then we are told it is "Oxford"
  
  Scenario:
  When we ask for the full name for "BNS"
  Then we are told it is "Birmingham New Street"


We then run that under cucumber, and we're offered snippets of code to help us implement the tests which might look like

  When(/^we ask for the full name for "(.*?)"$/) do |arg1|
    @station = loadStationFactory[arg1]
  end
  
  Then(/^we are told it is "(.*?)"$/) do |arg1|
    expect(@station.getFullName).to eq(arg1)
  end


and when we run that completed code, all of our scenarios are run and we see a full set of results:

 munchkin:lr grahamellis$ cucumber -s bdd_stations
 Feature: Checking we know station names
 
   Scenario: 
     When we ask for the full name for "MKM"
     Then we are told it is "Melksham"
 
   Scenario: 
     When we ask for the full name for "PLY"
     Then we are told it is "Plymouth"
 
   Scenario: 
     When we ask for the full name for "OXF"
     Then we are told it is "Oxford"
 
   Scenario: 
     When we ask for the full name for "BNS"
     Then we are told it is "Birmingham New Street"
       
       expected: "Birmingham New Street"
            got: "Barnes"
       
       (compared using ==)
        (RSpec::Expectations::ExpectationNotMetError)
       ./bdd_stations/step_definitions/station_steps.rb:10:in `/^we are told it is "(.*?)"$/'
       bdd_stations/station.feature:19:in `Then we are told it is "Birmingham New Street"'
 
 Failing Scenarios:
 cucumber bdd_stations/station.feature:17
 
 4 scenarios (1 failed, 3 passed)
 8 steps (1 failed, 7 passed)
 0m0.238s
 munchkin:lr grahamellis$


Files for this example:
[here]for the file to be tested
[here] for feature definitions
[here] for step implementation
[here] for the data used by the class
(written 2015-10-23)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
R221 - Ruby - Introduction to Cucumber
  [4380] Behaviour Driven Development / Ruby and Cucumber - (2015-01-02)
  [4381] Installing Cucumber (Ruby) - (2015-01-03)
  [4382] Second step Cucumber and Gherkin - beyond Hello World - (2015-01-03)
  [4383] Improved test in Cucumber with RSpec - (2015-01-03)
  [4384] Installing Cucumber on Ubuntu - cannot load such file -- mkmf (LoadError) message - (2015-01-04)
  [4386] Guide exercise to help you learn Gherkin, Cucumber and Rspec - (2015-01-06)
  [4552] Scenario outlines - tables of values to test - in Gherkin / Cucumber - (2015-10-23)

R108 - Ruby - More Classes and Objects
  [184] MTBF of coffee machines - (2005-01-20)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [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)
  [2604] Tips for writing a test program (Ruby / Python / Java) - (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)
  [3781] Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23)
  [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)


Back to
Build up classes into applications sharing data types in Ruby
Previous and next
or
Horse's mouth home
Forward to
Scenario outlines - tables of values to test - in Gherkin / Cucumber
Some other Articles
Preprocessor directives in C and C++ - what they mean
Passing information into functions in C - by name, by value
RUby - loading, using, changing, storing JSON format data
Testing your new class - first steps with cucumber
Clarrissa-Marybelle - too long to really fit?
Melksham - two small townships, or one big one?
RUH Hopper - experience and thoughts forward
Is the RUH hopper a limited, duplicate service running unnecessarily and at high cost?
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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