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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/enumerable_enumeratorized'
describe "Enumerable#take_while" do
before :each do
@enum = EnumerableSpecs::Numerous.new(3, 2, 1, :go)
end
it "returns an Enumerator if no block given" do
@enum.take_while.should be_an_instance_of(Enumerator)
end
it "returns no/all elements for {true/false} block" do
@enum.take_while{true}.should == @enum.to_a
@enum.take_while{false}.should == []
end
it "accepts returns other than true/false" do
@enum.take_while{1}.should == @enum.to_a
@enum.take_while{nil}.should == []
end
it "passes elements to the block until the first false" do
a = []
@enum.take_while{|obj| (a << obj).size < 3}.should == [3, 2]
a.should == [3, 2, 1]
end
it "will only go through what's needed" do
enum = EnumerableSpecs::EachCounter.new(4, 3, 2, 1, :stop)
enum.take_while { |x|
break 42 if x == 3
true
}.should == 42
enum.times_yielded.should == 2
end
it "doesn't return self when it could" do
a = [1,2,3]
a.take_while{true}.should_not equal(a)
end
it "calls the block with initial args when yielded with multiple arguments" do
yields = []
EnumerableSpecs::YieldsMixed.new.take_while{ |v| yields << v }
yields.should == [1, [2], 3, 5, [8, 9], nil, []]
end
it_behaves_like :enumerable_enumeratorized_with_unknown_size, :take_while
end
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