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# Spec for global variable behavior fixed for GH-1375.
#
# The bug caused global variables to stop updating after a particular number
# of updates. Specifically, with invokedynamic enabled, in order to reduce
# the cost of continuing to update global variables past a particular count,
# caching was turned off. However, the final update that switched off
# caching did not also properly invalidate the old value, allowing it to
# remain cached forever.
#
# This test puts the global variable updating logic in a method body, to
# help ensure it will run both interpreted and compiled in our various
# execution modes.
$gh1375
def gh1375_updater
old = $gh1375
$gh1375 += 1
return old, $gh1375
end
describe "A global variable" do
before :each do
$gh1375 = 0
end
it "always updates for read when modified" do
accum1 = []
accum2 = []
100_000.times do |i|
accum1[i], accum2[i] = gh1375_updater
end
expect(accum1) == (0...100_000).to_a
expect(accum2) == (1..100_000).to_a
end
end
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