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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/enumeratorized', __FILE__)
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 ArgumentError 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)
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
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
multi.each_cons(2).to_a.should == [[[1, 2], [3, 4, 5]], [[3, 4, 5], [6, 7, 8, 9]]]
end
describe "when no block is given" do
it "returns an enumerator" do
e = @enum.each_cons(3)
e.should be_an_instance_of(Enumerator)
e.to_a.should == @in_threes
end
describe "Enumerable with size" do
describe "returned Enumerator" do
describe "size" do
it "returns enum size - each_cons argument + 1" do
enum = EnumerableSpecs::NumerousWithSize.new(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
enum.each_cons(10).size.should == 1
enum.each_cons(9).size.should == 2
enum.each_cons(3).size.should == 8
enum.each_cons(2).size.should == 9
enum.each_cons(1).size.should == 10
end
it "returns 0 when the argument is larger than self" do
enum = EnumerableSpecs::NumerousWithSize.new(1, 2, 3)
enum.each_cons(20).size.should == 0
end
it "returns 0 when the enum is empty" do
enum = EnumerableSpecs::EmptyWithSize.new
enum.each_cons(10).size.should == 0
end
end
end
end
describe "Enumerable with no size" do
before :all do
@object = EnumerableSpecs::Numerous.new(1, 2, 3, 4)
@method = [:each_cons, 8]
end
it_should_behave_like :enumeratorized_with_unknown_size
end
end
end
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