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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
ruby_version_is "1.8.7" do
describe "Enumerable#cycle" do
describe "passed no argument or nil" do
it "loops indefinitely" do
[[],[nil]].each do |args|
bomb = 10
EnumerableSpecs::Numerous.new.cycle(*args) do
bomb -= 1
break 42 if bomb <= 0
end.should == 42
bomb.should == 0
end
end
it "returns if there are no elements" do
out = EnumerableSpecs::Empty.new.cycle { break :nope }
out.should be_nil
end
it "yields successive elements of the array repeatedly" do
b = []
EnumerableSpecs::Numerous.new(1,2,3).cycle do |elem|
b << elem
break if b.size == 7
end
b.should == [1,2,3,1,2,3,1]
end
it "calls each at most once" do
enum = EnumerableSpecs::EachCounter.new(1, 2)
enum.cycle.first(6).should == [1,2,1,2,1,2]
enum.times_called.should == 1
end
it "yields only when necessary" do
enum = EnumerableSpecs::EachCounter.new(10, 20, 30)
enum.cycle { |x| break if x == 20}
enum.times_yielded.should == 2
end
end
describe "passed a number n as an argument" do
it "returns nil and does nothing for non positive n" do
EnumerableSpecs::ThrowingEach.new.cycle(0) {}.should be_nil
EnumerableSpecs::NoEach.new.cycle(-22) {}.should be_nil
end
it "calls each at most once" do
enum = EnumerableSpecs::EachCounter.new(1, 2)
enum.cycle(3).to_a.should == [1,2,1,2,1,2]
enum.times_called.should == 1
end
it "yields only when necessary" do
enum = EnumerableSpecs::EachCounter.new(10, 20, 30)
enum.cycle(3) { |x| break if x == 20}
enum.times_yielded.should == 2
end
it "tries to convert n to an Integer using #to_int" do
enum = EnumerableSpecs::Numerous.new(3, 2, 1)
enum.cycle(2.3).to_a.should == [3, 2, 1, 3, 2, 1]
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
enum.cycle(obj).to_a.should == [3, 2, 1, 3, 2, 1]
end
it "raises a TypeError when the passed n can be coerced to Integer" do
enum = EnumerableSpecs::Numerous.new
lambda{ enum.cycle("cat"){} }.should raise_error(TypeError)
end
it "raises an ArgumentError if more arguments are passed" do
enum = EnumerableSpecs::Numerous.new
lambda{ enum.cycle(1, 2) {} }.should raise_error(ArgumentError)
end
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
multi.cycle(2).to_a.should == [[1, 2], [3, 4, 5], [6, 7, 8, 9], [1, 2], [3, 4, 5], [6, 7, 8, 9]]
end
end
end
end
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