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require File.expand_path('../../spec_helper', __FILE__)
describe "Hash literal" do
it "{} should return an empty hash" do
{}.size.should == 0
{}.should == {}
end
it "{} should return a new hash populated with the given elements" do
h = {:a => 'a', 'b' => 3, 44 => 2.3}
h.size.should == 3
h.should == {:a => "a", "b" => 3, 44 => 2.3}
end
it "treats empty expressions as nils" do
h = {() => ()}
h.keys.should == [nil]
h.values.should == [nil]
h[nil].should == nil
h = {() => :value}
h.keys.should == [nil]
h.values.should == [:value]
h[nil].should == :value
h = {:key => ()}
h.keys.should == [:key]
h.values.should == [nil]
h[:key].should == nil
end
it "freezes string keys on initialization" do
key = "foo"
h = {key => "bar"}
key.reverse!
h["foo"].should == "bar"
h.keys.first.should == "foo"
h.keys.first.frozen?.should == true
key.should == "oof"
end
it "checks duplicated keys on initialization" do
h = {:foo => :bar, :foo => :foo}
h.keys.size.should == 1
h.should == {:foo => :foo}
end
it "accepts a hanging comma" do
h = {:a => 1, :b => 2,}
h.size.should == 2
h.should == {:a => 1, :b => 2}
end
it "recognizes '=' at the end of the key" do
eval("{:a==>1}").should == {:"a=" => 1}
eval("{:a= =>1}").should == {:"a=" => 1}
eval("{:a= => 1}").should == {:"a=" => 1}
end
it "with '==>' in the middle raises SyntaxError" do
lambda {eval("{:a ==> 1}")}.should raise_error(SyntaxError)
end
end
language_version __FILE__, "hash"
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