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require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
describe "#drop" do
[
[[], 10, []],
[["A"], 10, []],
[["A"], 1, []],
[["A"], 0, ["A"]],
[%w[A B C], 0, %w[A B C]],
[%w[A B C], 2, ["C"]],
[(1..32), 3, (4..32)],
[(1..33), 32, [33]]
].each do |values, number, expected|
describe "#{number} from #{values.inspect}" do
let(:vector) { V[*values] }
it "preserves the original" do
vector.drop(number)
vector.should eql(V[*values])
end
it "returns #{expected.inspect}" do
vector.drop(number).should eql(V[*expected])
end
end
end
it "raises an ArgumentError if number of elements specified is negative" do
-> { V[1, 2, 3].drop(-1) }.should raise_error(ArgumentError)
-> { V[1, 2, 3].drop(-3) }.should raise_error(ArgumentError)
end
context "when number of elements specified is zero" do
let(:vector) { V[1, 2, 3, 4, 5, 6] }
it "returns self" do
vector.drop(0).should be(vector)
end
end
end
end
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