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Diffstat (limited to 'spec/ruby/core/kernel/freeze_spec.rb')
-rw-r--r-- | spec/ruby/core/kernel/freeze_spec.rb | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/freeze_spec.rb b/spec/ruby/core/kernel/freeze_spec.rb new file mode 100644 index 0000000000..961c1bccf0 --- /dev/null +++ b/spec/ruby/core/kernel/freeze_spec.rb @@ -0,0 +1,67 @@ +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 + + 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 + + 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 |