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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
ruby_version_is "1.9" do
describe "Enumerable#chunk" do
it "raises an ArgumentError if called without a block" do
lambda do
EnumerableSpecs::Numerous.new.chunk
end.should raise_error(ArgumentError)
end
it "returns an Enumerator if given a block" do
EnumerableSpecs::Numerous.new.chunk {}.should be_an_instance_of(enumerator_class)
end
it "yields each element of the Enumerable to the block" do
yields = []
EnumerableSpecs::Numerous.new.chunk {|e| yields << e}.to_a
EnumerableSpecs::Numerous.new.to_a.should == yields
end
it "returns an Enumerator of 2-element Arrays" do
EnumerableSpecs::Numerous.new.chunk {|e| true}.each do |a|
a.should be_an_instance_of(Array)
a.size.should == 2
end
end
it "sets the first element of each sub-Array to the return value of the block" do
EnumerableSpecs::Numerous.new.chunk {|e| -e }.each do |a|
a.first.should == -a.last.first
end
end
it "sets the last element of each sub-Array to the consecutive values for which the block returned the first element" do
ret = EnumerableSpecs::Numerous.new(5,5,2,3,4,5,7,1,9).chunk {|e| e >= 5 }.to_a
ret[0].last.should == [5, 5]
ret[1].last.should == [2, 3, 4]
ret[2].last.should == [5, 7]
ret[3].last.should == [1]
ret[4].last.should == [9]
end
it "sets a 2-element Array if the block returned :_alone" do
ret = EnumerableSpecs::Numerous.new(5,5,2,3,4,5,7,1,9).chunk {|e| e <= 3 && :_alone }.to_a
ret.should == [
[false, [5, 5]],
[:_alone, [2]],
[:_alone, [3]],
[false, [4, 5, 7]],
[:_alone, [1]],
[false, [9]]
]
end
it "rejects 2-element Arrays if the block returned nil" do
ret = EnumerableSpecs::Numerous.new(5,5,2,3,4,5,7,1,9).chunk {|e| e <= 3 && nil }.to_a
ret.should == [
[false, [5, 5]],
[false, [4, 5, 7]],
[false, [9]]
]
end
it "rejects 2-element Arrays if the block returned :_separator" do
ret = EnumerableSpecs::Numerous.new(5,5,2,3,4,5,7,1,9).chunk {|e| e <= 3 && :_separator }.to_a
ret.should == [
[false, [5, 5]],
[false, [4, 5, 7]],
[false, [9]]
]
end
it "raises an RuntimeError if the block returned a Symbol that is undefined but reserved format (first character is an underscore)" do
lambda {
EnumerableSpecs::Numerous.new(5,5,2,3,4,5,7,1,9).chunk {|e| e <= 3 && :_singleton }.to_a
}.should raise_error(RuntimeError)
end
end
end
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