RubyMotion count method with NSArray vs. Array

rubymotion_count_array_vs_nsarray.rb

describe Array do
  it "calls the Rubyish count method on Rubyish arrays" do
    count = [1,2,3,4,5,6].count { |i| i > 3 }
    count.should == 3
  end
  it "doesn't call the Rubyish count method on NSArray objects" do
    nsarray = NSArray.arrayWithArray([1,2,3,4,5,6])
    nsarrayCount = nsarray.count { |i| i > 3 }

    # The block above gets ignored and a warning is printed out in the console, so...
    nsarrayCount.should == 6 # WAT?? Yes, 6. Not 3.
  end

  it "doesn't use the Rubyish count, but I can deal with that using reject and length" do
    nsarray = NSArray.arrayWithArray([1,2,3,4,5,6])
    nsarrayCount = nsarray.reject { |i| i <= 3 }.length
    nsarrayCount.should == 3
  end
  it "doesn't use the Rubyish count, but I can deal with that using flatten to convert it" do
    nsarray = NSArray.arrayWithArray([1,2,3,4,5,6])
    notNsArray = [nsarray].flatten
    notNsArray.count { |i| i > 3 }.should == 3
  end
end