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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
# NOTE: A call to define_finalizer does not guarantee that the
# passed proc or callable will be called at any particular time.
describe "ObjectSpace.define_finalizer" do
it "raises an ArgumentError if the action does not respond to call" do
lambda {
ObjectSpace.define_finalizer("", mock("ObjectSpace.define_finalizer no #call"))
}.should raise_error(ArgumentError)
end
it "accepts an object and a proc" do
handler = lambda { |obj| obj }
ObjectSpace.define_finalizer("garbage", handler).should == [0, handler]
end
it "accepts an object and a callable" do
handler = mock("callable")
def handler.call(obj) end
ObjectSpace.define_finalizer("garbage", handler).should == [0, handler]
end
it "raises ArgumentError trying to define a finalizer on a non-reference" do
lambda {
ObjectSpace.define_finalizer(:blah) { 1 }
}.should raise_error(ArgumentError)
end
# see [ruby-core:24095]
it "calls finalizer on process termination" do
code = <<-RUBY
def scoped
Proc.new { puts "finalized" }
end
handler = scoped
obj = "Test"
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code).should == "finalized\n"
end
it "calls finalizer at exit even if it is self-referencing" do
code = <<-RUBY
obj = "Test"
handler = Proc.new { puts "finalized" }
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code).should == "finalized\n"
end
it "allows multiple finalizers with different 'callables' to be defined" do
code = <<-RUBY
obj = Object.new
ObjectSpace.define_finalizer(obj, Proc.new { STDOUT.write "finalized1\n" })
ObjectSpace.define_finalizer(obj, Proc.new { STDOUT.write "finalized2\n" })
exit 0
RUBY
ruby_exe(code).lines.sort.should == ["finalized1\n", "finalized2\n"]
end
ruby_version_is "2.7" do
it "warns in verbose mode if it is self-referencing" do
code = <<-RUBY
obj = "Test"
handler = Proc.new { puts "finalized" }
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code, :options => "-w", :args => "2>&1").should include("warning: object is reachable from finalizer - it may never be run")
end
it "warns in verbose mode if it is indirectly self-referencing" do
code = <<-RUBY
def scoped(indirect)
Proc.new { puts "finalized" }
end
obj = "Test"
indirect = [obj]
handler = scoped(indirect)
ObjectSpace.define_finalizer(obj, handler)
exit 0
RUBY
ruby_exe(code, :options => "-w", :args => "2>&1").should include("warning: object is reachable from finalizer - it may never be run")
end
end
end
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