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diff --git a/spec/ruby/core/array/difference_spec.rb b/spec/ruby/core/array/difference_spec.rb
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+++ b/spec/ruby/core/array/difference_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/difference'
+
+describe "Array#difference" do
+  it_behaves_like :array_binary_difference, :difference
+
+  it "returns a copy when called without any parameter" do
+    x = [1, 2, 3, 2]
+    x.difference.should == x
+    x.difference.should_not equal x
+  end
+
+  it "does not return subclass instances for Array subclasses" do
+    ArraySpecs::MyArray[1, 2, 3].difference.should be_an_instance_of(Array)
+  end
+
+  it "accepts multiple arguments" do
+    x = [1, 2, 3, 1]
+    x.difference([], [0, 1], [3, 4], [3]).should == [2]
+  end
+end