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require_relative '../../spec_helper'
describe "Performance warnings" do
guard -> { ruby_version_is("3.4") || RUBY_ENGINE == "truffleruby" } do
# Optimising Integer, Float or Symbol methods is kind of implementation detail
# but multiple implementations do so. So it seems reasonable to have a test case
# for at least one such common method.
# See https://bugs.ruby-lang.org/issues/20429
context "when redefined optimised methods" do
it "emits performance warning for redefining Integer#+" do
code = <<~CODE
Warning[:performance] = true
class Integer
ORIG_METHOD = instance_method(:+)
def +(...)
ORIG_METHOD.bind(self).call(...)
end
end
CODE
ruby_exe(code, args: "2>&1").should.include?("warning: Redefining 'Integer#+' disables interpreter and JIT optimizations")
end
end
end
end
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