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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
R108 - Ruby - More Classes and Objects
  [4550] Build up classes into applications sharing data types in Ruby - (2015-10-23)
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)
  [3782] Standard methods available on all objects in Ruby - (2012-06-23)
  [3781] Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23)
  [3760] Why you should use objects even for short data manipulation programs in Ruby - (2012-06-10)
  [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23)
  [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05)
  [3154] Changing a class later on - Ruby - (2011-02-02)
  [3142] Private and Public - and things between - (2011-01-22)
  [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02)
  [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2623] Object Oriented Ruby - new examples - (2010-02-03)
  [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2604] Tips for writing a test program (Ruby / Python / Java) - (2010-01-29)
  [2603] Ruby objects - a primer - (2010-01-29)
  [2601] Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27)
  [2292] Object Orientation in Ruby - intermediate examples - (2009-07-16)
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [184] MTBF of coffee machines - (2005-01-20)

R221 - Ruby - Introduction to Cucumber
  [4552] Scenario outlines - tables of values to test - in Gherkin / Cucumber - (2015-10-23)
  [4386] Guide exercise to help you learn Gherkin, Cucumber and Rspec - (2015-01-06)
  [4384] Installing Cucumber on Ubuntu - cannot load such file -- mkmf (LoadError) message - (2015-01-04)
  [4383] Improved test in Cucumber with RSpec - (2015-01-03)
  [4382] Second step Cucumber and Gherkin - beyond Hello World - (2015-01-03)
  [4381] Installing Cucumber (Ruby) - (2015-01-03)
  [4380] Behaviour Driven Development / Ruby and Cucumber - (2015-01-02)


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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
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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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