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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Kernel#freeze" do
it "prevents self from being further modified" do
o = mock('o')
o.frozen?.should be_false
o.freeze
o.frozen?.should be_true
end
it "returns self" do
o = Object.new
o.freeze.should equal(o)
end
ruby_version_is '' ... '1.9' do
it "has no effect on immediate values" do
[nil, true, false, 1, :sym].map {|o| o.freeze; o.frozen? }.should ==
[false, false, false, false, false]
end
end
ruby_version_is '1.9' do
# 1.9 allows immediates to be frozen #1747. Test in a separate process so
# as to avoid polluting the spec process with frozen immediates.
it "freezes immediate values" do
ruby_exe("print [nil, true, false, 1, :sym].map {|o| o.freeze; o.frozen? }").should ==
"[true, true, true, true, true]"
end
end
ruby_version_is "" ... "1.9" do
it "causes mutative calls to raise TypeError" do
o = Class.new do
def mutate; @foo = 1; end
end.new
o.freeze
lambda {o.mutate}.should raise_error(TypeError)
end
it "causes instance_variable_set to raise TypeError" do
o = Object.new
o.freeze
lambda {o.instance_variable_set(:@foo, 1)}.should raise_error(TypeError)
end
end
ruby_version_is "1.9" do
it "causes mutative calls to raise RuntimeError" do
o = Class.new do
def mutate; @foo = 1; end
end.new
o.freeze
lambda {o.mutate}.should raise_error(RuntimeError)
end
it "causes instance_variable_set to raise RuntimeError" do
o = Object.new
o.freeze
lambda {o.instance_variable_set(:@foo, 1)}.should raise_error(RuntimeError)
end
end
end
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