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require "spec"
require "weak_ref"
require "../support/finalize"
private class Foo
include FinalizeCounter
def initialize(@key : String)
end
end
describe WeakRef do
it "should get dereferenced object" do
foo = Foo.new("foo")
ref = WeakRef.new(foo)
ref.should_not be_nil
ref.value.should be(foo)
end
it "should get dereferenced object in data section" do
foo = "foo"
ref = WeakRef.new(foo)
ref.value.should be(foo)
end
it "should not crash with object in data section during GC" do
foo = "foo"
ref = WeakRef.new(foo)
GC.collect
end
it "FinalizeState counts released objects" do
FinalizeState.reset
FinalizeState.count("foo").should eq 0
10.times do
Foo.new("foo")
end
GC.collect
FinalizeState.count("foo").should be > 0
end
it "Referenced object should not be released" do
FinalizeState.reset
instances = [] of Foo
FinalizeState.count("strong_foo_ref").should eq 0
10.times do
instances << Foo.new("strong_foo_ref")
end
GC.collect
FinalizeState.count("strong_foo_ref").should eq 0
end
it "Weak referenced object should be released if no other reference" do
FinalizeState.reset
instances = [] of WeakRef(Foo)
last = nil
10.times do
last = Foo.new("weak_foo_ref")
instances << WeakRef.new(last)
end
GC.collect
FinalizeState.count("weak_foo_ref").should be > 0
instances.count { |wr| wr.value.nil? }.should be > 0
instances[-1].value.should_not be_nil
# Use `last` to stop the variable from being optimised away in release mode.
last.to_s
end
end
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