require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Enumerable#drop" do before :each do @enum = EnumerableSpecs::Numerous.new(3, 2, 1, :go) end it "requires exactly one argument" do ->{ @enum.drop{} }.should raise_error(ArgumentError) ->{ @enum.drop(1, 2){} }.should raise_error(ArgumentError) end describe "passed a number n as an argument" do it "raises ArgumentError if n < 0" do ->{ @enum.drop(-1) }.should raise_error(ArgumentError) end it "tries to convert n to an Integer using #to_int" do @enum.drop(2.3).should == [1, :go] obj = mock('to_int') obj.should_receive(:to_int).and_return(2) @enum.drop(obj).should == [1, :go] end it "returns [] for empty enumerables" do EnumerableSpecs::Empty.new.drop(0).should == [] EnumerableSpecs::Empty.new.drop(2).should == [] end it "returns [] if dropping all" do @enum.drop(5).should == [] EnumerableSpecs::Numerous.new(3, 2, 1, :go).drop(4).should == [] end it "raises a TypeError when the passed n cannot be coerced to Integer" do ->{ @enum.drop("hat") }.should raise_error(TypeError) ->{ @enum.drop(nil) }.should raise_error(TypeError) end end end