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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#concat" do
it "returns the array itself" do
ary = [1,2,3]
ary.concat([4,5,6]).equal?(ary).should be_true
end
it "appends the elements in the other array" do
ary = [1, 2, 3]
ary.concat([9, 10, 11]).should equal(ary)
ary.should == [1, 2, 3, 9, 10, 11]
ary.concat([])
ary.should == [1, 2, 3, 9, 10, 11]
end
it "does not loop endlessly when argument is self" do
ary = ["x", "y"]
ary.concat(ary).should == ["x", "y", "x", "y"]
end
it "tries to convert the passed argument to an Array using #to_ary" do
obj = mock('to_ary')
obj.should_receive(:to_ary).and_return(["x", "y"])
[4, 5, 6].concat(obj).should == [4, 5, 6, "x", "y"]
end
it "does not call #to_ary on Array subclasses" do
obj = ArraySpecs::ToAryArray[5, 6, 7]
obj.should_not_receive(:to_ary)
[].concat(obj).should == [5, 6, 7]
end
it "raises a FrozenError when Array is frozen and modification occurs" do
-> { ArraySpecs.frozen_array.concat [1] }.should raise_error(FrozenError)
end
# see [ruby-core:23666]
it "raises a FrozenError when Array is frozen and no modification occurs" do
-> { ArraySpecs.frozen_array.concat([]) }.should raise_error(FrozenError)
end
it "appends elements to an Array with enough capacity that has been shifted" do
ary = [1, 2, 3, 4, 5]
2.times { ary.shift }
2.times { ary.pop }
ary.concat([5, 6]).should == [3, 5, 6]
end
it "appends elements to an Array without enough capacity that has been shifted" do
ary = [1, 2, 3, 4]
3.times { ary.shift }
ary.concat([5, 6]).should == [4, 5, 6]
end
it "takes multiple arguments" do
ary = [1, 2]
ary.concat [3, 4]
ary.should == [1, 2, 3, 4]
end
it "concatenates the initial value when given arguments contain 2 self" do
ary = [1, 2]
ary.concat ary, ary
ary.should == [1, 2, 1, 2, 1, 2]
end
it "returns self when given no arguments" do
ary = [1, 2]
ary.concat.should equal(ary)
ary.should == [1, 2]
end
end
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