Question

I’m trying to polish up my Ruby by re writing Kent Beck’s xUnit Python example from ‘Test Driven Development: By Example’. I’ve got quite far but now I get the following error when I run which I don’t grok.

C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `test_running': wrong number of arguments (0 for 2) (ArgumentError)     from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:21:in `run'     from C:\Documents and Settings\aharmel\My Documents\My Workspace\TDD_Book\TDDBook_xUnit_RubyVersion\lib\main.rb:85 

My code looks like this:

class TestCase   def initialize(name)     puts '1.  inside TestCase.initialise: @name: #{name}'     @name = name   end   def set_up     # No implementation (but present to be overridden in WasRun)    end   def run     self.set_up     self.send @name  # <<<<<<<<<<<<<<<<<<<<<<<<<= ERROR HERE!!!!!!   end end  class WasRun < TestCase   attr_accessor :wasRun   attr_accessor :wasSetUp     def initialize(name)     super(name)   end   def set_up     @wasRun = false     @wasSetUp = true   end   def test_method     @wasRun = true   end end  class TestCaseTest < TestCase   def set_up     @test = WasRun.new('test_method')   end   def test_running     @test.run     puts 'test was run? (true expected): #{test.wasRun}'   end   def test_set_up     @test.run     puts 'test was set up? (true expected): #{test.wasSetUp}'   end end  TestCaseTest.new('test_running').run 

Can anyone point out my obvious mistake?

Answer 1

It’s your print statement:

  puts 'test was run? (true expected): #{test.wasRun}' 

should be

  puts 'test was run? (true expected): #{@test.wasRun}' 

without the ‘@’ you are calling Kernel#test, which expects 2 variables.