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# -*- encoding: us-ascii -*-
require_relative '../../../../spec_helper'
describe :enumerator_lazy_to_enum, shared: true do
before :each do
@infinite = (0..Float::INFINITY).lazy
end
it "requires multiple arguments" do
Enumerator::Lazy.instance_method(@method).arity.should < 0
end
it "returns a new instance of Enumerator::Lazy" do
ret = @infinite.send @method
ret.should be_an_instance_of(Enumerator::Lazy)
ret.should_not equal(@infinite)
end
it "sets #size to nil when not given a block" do
Enumerator::Lazy.new(Object.new, 100) {}.send(@method).size.should == nil
end
it "sets given block to size when given a block" do
Enumerator::Lazy.new(Object.new, 100) {}.send(@method) { 30 }.size.should == 30
end
it "generates a lazy enumerator from the given name" do
@infinite.send(@method, :with_index, 10).first(3).should == [[0, 10], [1, 11], [2, 12]]
end
it "passes given arguments to wrapped method" do
@infinite.send(@method, :each_slice, 2).map { |assoc| assoc.first * assoc.last }.first(4).should == [0, 6, 20, 42]
end
it "used by some parent's methods though returning Lazy" do
{ each_with_index: [],
with_index: [],
cycle: [1],
each_with_object: [Object.new],
with_object: [Object.new],
each_slice: [2],
each_entry: [],
each_cons: [2]
}.each_pair do |method, args|
@infinite.method(method).owner.should_not equal(Enumerator::Lazy)
@infinite.send(method, *args).should be_an_instance_of(Enumerator::Lazy)
end
end
it "works with an infinite enumerable" do
s = 0..Float::INFINITY
s.lazy.send(@method, :with_index).first(100).should ==
s.first(100).to_enum.send(@method, :with_index).to_a
end
end
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