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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
describe "on integers" do
it "has no effect since they are already frozen" do
1.frozen?.should be_true
1.freeze
bignum = bignum_value
bignum.frozen?.should be_true
bignum.freeze
end
end
describe "on a Float" do
it "has no effect since it is already frozen" do
1.2.frozen?.should be_true
1.2.freeze
end
end
describe "on a Symbol" do
it "has no effect since it is already frozen" do
:sym.frozen?.should be_true
:sym.freeze
end
end
describe "on true, false and nil" do
it "has no effect since they are already frozen" do
nil.frozen?.should be_true
true.frozen?.should be_true
false.frozen?.should be_true
nil.freeze
true.freeze
false.freeze
end
end
describe "on a Complex" do
it "has no effect since it is already frozen" do
c = Complex(1.3, 3.1)
c.frozen?.should be_true
c.freeze
end
end
describe "on a Rational" do
it "has no effect since it is already frozen" do
r = Rational(1, 3)
r.frozen?.should be_true
r.freeze
end
end
it "causes mutative calls to raise RuntimeError" do
o = Class.new do
def mutate; @foo = 1; end
end.new
o.freeze
-> {o.mutate}.should raise_error(RuntimeError)
end
it "causes instance_variable_set to raise RuntimeError" do
o = Object.new
o.freeze
-> {o.instance_variable_set(:@foo, 1)}.should raise_error(RuntimeError)
end
it "freezes an object's singleton class" do
o = Object.new
c = o.singleton_class
c.frozen?.should == false
o.freeze
c.frozen?.should == true
end
end
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