1 files changed, 11 insertions, 79 deletions
diff --git a/spec/ruby/core/array/intersection_spec.rb b/spec/ruby/core/array/intersection_spec.rb
index e399509ea7..e01a68d389 100644
--- a/spec/ruby/core/array/intersection_spec.rb
+++ b/spec/ruby/core/array/intersection_spec.rb
@@ -1,87 +1,19 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/intersection'
 
 describe "Array#&" do
-  it "creates an array with elements common to both arrays (intersection)" do
-    ([] & []).should == []
-    ([1, 2] & []).should == []
-    ([] & [1, 2]).should == []
-    ([ 1, 3, 5 ] & [ 1, 2, 3 ]).should == [1, 3]
-  end
-
-  it "creates an array with no duplicates" do
-    ([ 1, 1, 3, 5 ] & [ 1, 2, 3 ]).uniq!.should == nil
-  end
-
-  it "creates an array with elements in order they are first encountered" do
-    ([ 1, 2, 3, 2, 5 ] & [ 5, 2, 3, 4 ]).should == [2, 3, 5]
-  end
-
-  it "does not modify the original Array" do
-    a = [1, 1, 3, 5]
-    (a & [1, 2, 3]).should == [1, 3]
-    a.should == [1, 1, 3, 5]
-  end
-
-  it "properly handles recursive arrays" do
-    empty = ArraySpecs.empty_recursive_array
-    (empty & empty).should == empty
-
-    (ArraySpecs.recursive_array & []).should == []
-    ([] & ArraySpecs.recursive_array).should == []
-
-    (ArraySpecs.recursive_array & ArraySpecs.recursive_array).should == [1, 'two', 3.0, ArraySpecs.recursive_array]
-  end
-
-  it "tries to convert the passed argument to an Array using #to_ary" do
-    obj = mock('[1,2,3]')
-    obj.should_receive(:to_ary).and_return([1, 2, 3])
-    ([1, 2] & obj).should == ([1, 2])
-  end
-
-  it "determines equivalence between elements in the sense of eql?" do
-    not_supported_on :opal do
-      ([5.0, 4.0] & [5, 4]).should == []
-    end
-
-    str = "x"
-    ([str] & [str.dup]).should == [str]
-
-    obj1 = mock('1')
-    obj2 = mock('2')
-    obj1.stub!(:hash).and_return(0)
-    obj2.stub!(:hash).and_return(0)
-    obj1.should_receive(:eql?).at_least(1).and_return(true)
-    obj2.stub!(:eql?).and_return(true)
-
-    ([obj1] & [obj2]).should == [obj1]
-    ([obj1, obj1, obj2, obj2] & [obj2]).should == [obj1]
-
-    obj1 = mock('3')
-    obj2 = mock('4')
-    obj1.stub!(:hash).and_return(0)
-    obj2.stub!(:hash).and_return(0)
-    obj1.should_receive(:eql?).at_least(1).and_return(false)
+  it_behaves_like :array_intersection, :&
+end
 
-    ([obj1] & [obj2]).should == []
-    ([obj1, obj1, obj2, obj2] & [obj2]).should == [obj2]
-  end
+describe "Array#intersection" do
+  it_behaves_like :array_intersection, :intersection
 
-  it "does return subclass instances for Array subclasses" do
-    (ArraySpecs::MyArray[1, 2, 3] & []).should be_an_instance_of(Array)
-    (ArraySpecs::MyArray[1, 2, 3] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
-    ([] & ArraySpecs::MyArray[1, 2, 3]).should be_an_instance_of(Array)
+  it "accepts multiple arguments" do
+    [1, 2, 3, 4].intersection([1, 2, 3], [2, 3, 4]).should == [2, 3]
   end
 
-  it "does not call to_ary on array subclasses" do
-    ([5, 6] & ArraySpecs::ToAryArray[1, 2, 5, 6]).should == [5, 6]
-  end
-
-  it "properly handles an identical item even when its #eql? isn't reflexive" do
-    x = mock('x')
-    x.stub!(:hash).and_return(42)
-    x.stub!(:eql?).and_return(false) # Stubbed for clarity and latitude in implementation; not actually sent by MRI.
-
-    ([x] & [x]).should == [x]
+  it "preserves elements order from original array" do
+    [1, 2, 3, 4].intersection([3, 2, 1]).should == [1, 2, 3]
   end
 end