prevent memory allocation for GC tests
We observed test failures on test_latest_gc_info with random order CI. http://ci.rvm.jp/results/trunk-random1@phosphorus-docker/2998078l0ll To solve it, use a pre-allocated hash object and rehearsal.
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@ -145,11 +145,15 @@ class TestGc < Test::Unit::TestCase
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assert_equal :newobj, GC.latest_gc_info[:gc_by]
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eom
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GC.latest_gc_info(h = {}) # allocate hash and rehearsal
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GC.start
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GC.start
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assert_equal :force, GC.latest_gc_info[:major_by] if use_rgengc?
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assert_equal :method, GC.latest_gc_info[:gc_by]
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assert_equal true, GC.latest_gc_info[:immediate_sweep]
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GC.start
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GC.latest_gc_info(h)
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assert_equal :force, h[:major_by] if use_rgengc?
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assert_equal :method, h[:gc_by]
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assert_equal true, h[:immediate_sweep]
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GC.stress = true
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assert_equal :force, GC.latest_gc_info[:major_by]
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