ruby/spec/rubyspec/library/matrix/shared/collect.rb

require File.expand_path('../../fixtures/classes', __FILE__)
require 'matrix'

describe :collect, shared: true do
  before :all do
    @m = Matrix[ [1, 2], [1, 2] ]
  end

  it "returns an instance of Matrix" do
    @m.send(@method){|n| n * 2 }.should be_kind_of(Matrix)
  end

  it "returns a Matrix where each element is the result of the block" do
    @m.send(@method) { |n| n * 2 }.should == Matrix[ [2, 4], [2, 4] ]
  end

  it "returns an enumerator if no block is given" do
    @m.send(@method).should be_an_instance_of(Enumerator)
  end

  describe "for a subclass of Matrix" do
    it "returns an instance of that subclass" do
      MatrixSub.ins.send(@method){1}.should be_an_instance_of(MatrixSub)
    end
  end
end