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require File.expand_path('../../../spec_helper', __FILE__) require File.expand_path('../fixtures/classes', __FILE__) require 'enumerator' describe "Enumerable#each_cons" do before :each do @enum = EnumerableSpecs::Numerous.new(4,3,2,1) @in_threes = [[4,3,2],[3,2,1]] end it "passes element groups to the block" do acc = [] @enum.each_cons(3){|g| acc << g}.should be_nil acc.should == @in_threes end it "raises an Argument Error if there is not a single parameter > 0" do lambda{ @enum.each_cons(0){} }.should raise_error(ArgumentError) lambda{ @enum.each_cons(-2){} }.should raise_error(ArgumentError) lambda{ @enum.each_cons{} }.should raise_error(ArgumentError) lambda{ @enum.each_cons(2,2){} }.should raise_error(ArgumentError) end it "tries to convert n to an Integer using #to_int" do acc = [] @enum.each_cons(3.3){|g| acc << g}.should == nil acc.should == @in_threes obj = mock('to_int') obj.should_receive(:to_int).and_return(3) @enum.each_cons(obj){|g| break g.length}.should == 3 end it "works when n is >= full length" do full = @enum.to_a acc = [] @enum.each_cons(full.length){|g| acc << g} acc.should == [full] acc = [] @enum.each_cons(full.length+1){|g| acc << g} acc.should == [] end it "yields only as much as needed" do cnt = EnumerableSpecs::EachCounter.new(1, 2, :stop, "I said stop!", :got_it) cnt.each_cons(2) {|g| break 42 if g[-1] == :stop }.should == 42 cnt.times_yielded.should == 3 end ruby_version_is '1.8.7' do it "returns an enumerator if no block" do e = @enum.each_cons(3) e.should be_an_instance_of(enumerator_class) e.to_a.should == @in_threes end end end
Version data entries
52 entries across 52 versions & 2 rubygems