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require "spec"
describe "Box" do
it "boxes and unboxes" do
a = 1
box = Box.box(a)
Box(Int32).unbox(box).should eq(1)
end
it "boxing a reference returns the same pointer" do
a = "foo"
box = Box.box(a)
box.address.should eq(a.object_id)
Box(String).unbox(box).should be(a)
end
it "boxing a nilable reference returns the same pointer" do
a = "foo".as(String?)
box = Box.box(a)
box.address.should eq(a.object_id)
b = Box(String?).unbox(box)
b.should be_a(String)
b.should be(a)
end
it "boxing a nilable value returns the same value" do
a = 1.as(Int32?)
box = Box.box(a)
b = Box(Int32?).unbox(box)
b.should be_a(Int32)
b.should eq(a)
end
it "boxes with explicit type" do
box = Box(Int32?).box(1)
b = Box(Int32?).unbox(box)
b.should be_a(Int32)
b.should eq(1)
end
it "boxing nil returns a null pointer" do
box = Box.box(nil)
box.address.should eq(0)
Box(Nil).unbox(box).should be_nil
end
it "boxing nil in a reference-like union returns a null pointer (#11839)" do
box = Box.box(nil.as(String?))
box.address.should eq(0)
Box(String?).unbox(box).should be_nil
end
it "boxing nil in a value-like union doesn't crash (#11839)" do
box = Box.box(nil.as(Int32?))
Box(Int32?).unbox(box).should be_nil
end
end
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