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diff --git a/spec/ruby/security/cve_2011_4815_spec.rb b/spec/ruby/security/cve_2011_4815_spec.rb
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+++ b/spec/ruby/security/cve_2011_4815_spec.rb
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+require_relative '../spec_helper'
+
+describe :resists_cve_2011_4815, shared: true do
+  it "resists CVE-2011-4815 by having different hash codes in different processes" do
+    eval("(#{@method}).hash.to_s").should_not == ruby_exe("print (#{@method}).hash")
+  end
+end
+
+describe "Object#hash" do
+  it_behaves_like :resists_cve_2011_4815, 'Object.new'
+end
+
+describe "Integer#hash with a small value" do
+  it_behaves_like :resists_cve_2011_4815, '14'
+end
+
+describe "Integer#hash with a large value" do
+  it_behaves_like :resists_cve_2011_4815, '100000000000000000000000000000'
+end
+
+describe "Float#hash" do
+  it_behaves_like :resists_cve_2011_4815, '3.14'
+end
+
+describe "Rational#hash" do
+  it_behaves_like :resists_cve_2011_4815, 'Rational(1, 2)'
+end
+
+describe "Complex#hash" do
+  it_behaves_like :resists_cve_2011_4815, 'Complex(1, 2)'
+end
+
+describe "String#hash" do
+  it_behaves_like :resists_cve_2011_4815, '"abc"'
+end
+
+describe "Symbol#hash" do
+  it_behaves_like :resists_cve_2011_4815, ':a'
+end
+
+describe "Array#hash" do
+  it_behaves_like :resists_cve_2011_4815, '[1, 2, 3]'
+end
+
+describe "Hash#hash" do
+  it_behaves_like :resists_cve_2011_4815, '{a: 1, b: 2, c: 3}'
+end