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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#values_at" do
it "returns an array of elements at the indexes when passed indexes" do
[1, 2, 3, 4, 5].values_at().should == []
[1, 2, 3, 4, 5].values_at(1, 0, 5, -1, -8, 10).should == [2, 1, nil, 5, nil, nil]
end
it "calls to_int on its indices" do
obj = mock('1')
def obj.to_int() 1 end
[1, 2].values_at(obj, obj, obj).should == [2, 2, 2]
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
empty.values_at(0, 1, 2).should == [empty, nil, nil]
array = ArraySpecs.recursive_array
array.values_at(0, 1, 2, 3).should == [1, 'two', 3.0, array]
end
describe "when passed ranges" do
it "returns an array of elements in the ranges" do
[1, 2, 3, 4, 5].values_at(0..2, 1...3, 2..-2).should == [1, 2, 3, 2, 3, 3, 4]
[1, 2, 3, 4, 5].values_at(6..4).should == []
end
it "calls to_int on arguments of ranges" do
from = mock('from')
to = mock('to')
# So we can construct a range out of them...
def from.<=>(o) 0 end
def to.<=>(o) 0 end
def from.to_int() 1 end
def to.to_int() -2 end
ary = [1, 2, 3, 4, 5]
ary.values_at(from .. to, from ... to, to .. from).should == [2, 3, 4, 2, 3]
end
end
describe "when passed a range" do
it "fills with nil if the index is out of the range" do
[0, 1].values_at(0..3).should == [0, 1, nil, nil]
[0, 1].values_at(2..4).should == [nil, nil, nil]
end
describe "on an empty array" do
it "fills with nils if the index is out of the range" do
[].values_at(0..2).should == [nil, nil, nil]
[].values_at(1..3).should == [nil, nil, nil]
end
end
end
it "does not return subclass instance on Array subclasses" do
ArraySpecs::MyArray[1, 2, 3].values_at(0, 1..2, 1).should be_an_instance_of(Array)
end
it "works when given endless ranges" do
[1, 2, 3, 4].values_at(eval("(1..)")).should == [2, 3, 4]
[1, 2, 3, 4].values_at(eval("(3...)")).should == [4]
end
it "works when given beginless ranges" do
[1, 2, 3, 4].values_at((..2)).should == [1, 2, 3]
[1, 2, 3, 4].values_at((...2)).should == [1, 2]
end
end
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