running_methods_whose_names_begin_with_test__TWGR_15_9.rb

# === Running methods whose names begin with test_
#
# From {The Well Grounded Rubyist by David A. Black}[http://www.manning.com/black2/]
#
# This example implements a test framework.  The really interesting
# part is the initial definition.  self.inherited(c) is called when
# this class is inherited into a new class.  The argument c is a
# reference to the new class.  David then calls c.class_eval, whose
# argument is a block which will be executed in the scope of the new
# class.  So when self.method_added is called, self now refers to the
# new (inheriting) class.
#
# Therefore when a method is added to any class that inherits from
# MicroTest, that method will trigger the execution of the
# c.class_eval do block.

require 'callertools'

class MicroTest

  def self.inherited(c)
    c.class_eval do
      def self.method_added(m)
        if m.to_s =~ /^test/                         
          obj = self.new                             
          if self.instance_methods.include?(:setup)  
            obj.setup
          end
          obj.send(m)
        end
      end
    end
  end

  def assert(assertion)                              
    if assertion
      puts "Assertion passed"
      true
    else
      puts "Assertion failed:"
      stack = CallerTools::Stack.new                   
      failure = stack.find {|call| call.meth !~ /assert/ } 
      puts failure
      false
    end
  end

  def assert_equal(expected, actual)                 
    result assert(expected == actual)
    puts "(#{actual} is not #{expected})" unless result   
    result
  end
end

setup and teardown bracketing all tests (Test::Unit) from the Ruby Way by Hal Fulton.rb

require 'test/unit'

class TestFoo < Test::Unit::TestCase

  # === Master setup and teardown methods
  # methods invoked before and after all tests

  def self.master_setup
    # stuff
  end
  
  def self.master_teardown
    # stuff
  end
  
  # === override the existing suite method
  
  def self.suite
    mysuite = super

    def mysuite.run(*args)
      TestFoo.master_setup
      super
      TestFoo.master_teardown
    end

  end

  # regular setup and teardown, followed by tests, as usual

end