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diff --git a/spec/ruby/core/array/reverse_each_spec.rb b/spec/ruby/core/array/reverse_each_spec.rb
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+++ b/spec/ruby/core/array/reverse_each_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/enumeratorize'
+require_relative '../enumerable/shared/enumeratorized'
+
+# Modifying a collection while the contents are being iterated
+# gives undefined behavior. See
+# https://blade.ruby-lang.org/ruby-core/23633
+
+describe "Array#reverse_each" do
+  before :each do
+    ScratchPad.record []
+  end
+
+  it "traverses array in reverse order and pass each element to block" do
+    [1, 3, 4, 6].reverse_each { |i| ScratchPad << i }
+    ScratchPad.recorded.should == [6, 4, 3, 1]
+  end
+
+  it "returns self" do
+    a = [:a, :b, :c]
+    a.reverse_each { |x| }.should equal(a)
+  end
+
+  it "yields only the top level element of an empty recursive arrays" do
+    empty = ArraySpecs.empty_recursive_array
+    empty.reverse_each { |i| ScratchPad << i }
+    ScratchPad.recorded.should == [empty]
+  end
+
+  it "yields only the top level element of a recursive array" do
+    array = ArraySpecs.recursive_array
+    array.reverse_each { |i| ScratchPad << i }
+    ScratchPad.recorded.should == [array, array, array, array, array, 3.0, 'two', 1]
+  end
+
+  it "returns the correct size when no block is given" do
+    [1, 2, 3].reverse_each.size.should == 3
+  end
+
+  it "tolerates increasing an array size during iteration" do
+    array = [:a, :b, :c]
+    ScratchPad.record []
+    i = 0
+
+    array.reverse_each do |e|
+      ScratchPad << e
+      array.prepend i if i < 100
+      i += 1
+    end
+
+    ScratchPad.recorded.should == [:c, :a, 1]
+  end
+
+  it_behaves_like :enumeratorize, :reverse_each
+  it_behaves_like :enumeratorized_with_origin_size, :reverse_each, [1,2,3]
+end