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 end