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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Hash#shift" do
it "removes a pair from hash and return it" do
h = new_hash(:a => 1, :b => 2, "c" => 3, nil => 4, [] => 5)
h2 = h.dup
h.size.times do |i|
r = h.shift
r.should be_kind_of(Array)
h2[r.first].should == r.last
h.size.should == h2.size - i - 1
end
h.should == new_hash
end
it "returns nil from an empty hash " do
new_hash.shift.should == nil
end
it "returns (computed) default for empty hashes" do
new_hash(5).shift.should == 5
h = new_hash { |*args| args }
h.shift.should == [h, nil]
end
ruby_version_is "" ... "1.9" do
it "raises a TypeError if called on a frozen instance" do
lambda { HashSpecs.frozen_hash.shift }.should raise_error(TypeError)
lambda { HashSpecs.empty_frozen_hash.shift }.should raise_error(TypeError)
end
end
ruby_version_is "1.9" do
it "raises a RuntimeError if called on a frozen instance" do
lambda { HashSpecs.frozen_hash.shift }.should raise_error(RuntimeError)
lambda { HashSpecs.empty_frozen_hash.shift }.should raise_error(RuntimeError)
end
end
end
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