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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#chunk_while" do
before :each do
ary = [10, 9, 7, 6, 4, 3, 2, 1]
@enum = EnumerableSpecs::Numerous.new(*ary)
@result = @enum.chunk_while { |i, j| i - 1 == j }
@enum_length = ary.length
end
context "when given a block" do
it "returns an enumerator" do
@result.should be_an_instance_of(Enumerator)
end
it "splits chunks between adjacent elements i and j where the block returns false" do
@result.to_a.should == [[10, 9], [7, 6], [4, 3, 2, 1]]
end
it "calls the block for length of the receiver enumerable minus one times" do
times_called = 0
@enum.chunk_while do |i, j|
times_called += 1
i - 1 == j
end.to_a
times_called.should == (@enum_length - 1)
end
end
context "when not given a block" do
it "raises an ArgumentError" do
lambda { @enum.chunk_while }.should raise_error(ArgumentError)
end
end
context "on a single-element array" do
it "ignores the block and returns an enumerator that yields [element]" do
[1].chunk_while {|x| x.even?}.to_a.should == [[1]]
end
end
end
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