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require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
describe "#group_by" do
context "with a block" do
[
[[], []],
[[1], [true => V[1]]],
[[1, 2, 3, 4], [true => V[1, 3], false => V[2, 4]]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:vector) { V[*values] }
it "returns #{expected.inspect}" do
vector.group_by(&:odd?).should eql(H[*expected])
vector.should eql(V.new(values)) # make sure it hasn't changed
end
end
end
end
context "without a block" do
[
[[], []],
[[1], [1 => V[1]]],
[[1, 2, 3, 4], [1 => V[1], 2 => V[2], 3 => V[3], 4 => V[4]]],
].each do |values, expected|
context "on #{values.inspect}" do
let(:vector) { V[*values] }
it "returns #{expected.inspect}" do
vector.group_by.should eql(H[*expected])
vector.should eql(V.new(values)) # make sure it hasn't changed
end
end
end
end
context "on an empty vector" do
it "returns an empty hash" do
V.empty.group_by { |x| x }.should eql(H.empty)
end
end
it "returns a hash without default proc" do
V[1,2,3].group_by { |x| x }.default_proc.should be_nil
end
context "from a subclass" do
it "returns an Hash whose values are instances of the subclass" do
subclass = Class.new(Hamster::Vector)
instance = subclass.new([1, 'string', :symbol])
instance.group_by { |x| x.class }.values.each { |v| v.class.should be(subclass) }
end
end
end
end
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