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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#slice_when" do
before :each do
ary = [10, 9, 7, 6, 4, 3, 2, 1]
@enum = EnumerableSpecs::Numerous.new(*ary)
@result = @enum.slice_when { |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 true" 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.slice_when do |i, j|
times_called += 1
i - 1 != j
end.to_a
times_called.should == (@enum_length - 1)
end
it "doesn't yield an empty array if the block matches the first or the last time" do
@enum.slice_when { true }.to_a.should == [[10], [9], [7], [6], [4], [3], [2], [1]]
end
it "doesn't yield an empty array on a small enumerable" do
EnumerableSpecs::Empty.new.slice_when { raise }.to_a.should == []
EnumerableSpecs::Numerous.new(42).slice_when { raise }.to_a.should == [[42]]
end
end
context "when not given a block" do
it "raises an ArgumentError" do
-> { @enum.slice_when }.should raise_error(ArgumentError)
end
end
describe "when an iterator method yields more than one value" do
it "processes all yielded values" do
def foo
yield 1, 2
end
to_enum(:foo).slice_when { true }.to_a.should == [[[1, 2]]]
end
end
end
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