1 files changed, 25 insertions, 0 deletions
diff --git a/spec/ruby/core/array/union_spec.rb b/spec/ruby/core/array/union_spec.rb
new file mode 100644
index 0000000000..ba2cc0d6b7
--- /dev/null
+++ b/spec/ruby/core/array/union_spec.rb
@@ -0,0 +1,25 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/union'
+
+describe "Array#|" do
+  it_behaves_like :array_binary_union, :|
+end
+
+describe "Array#union" do
+  it_behaves_like :array_binary_union, :union
+
+  it "returns unique elements when given no argument" do
+    x = [1, 2, 3, 2]
+    x.union.should == [1, 2, 3]
+  end
+
+  it "does not return subclass instances for Array subclasses" do
+    ArraySpecs::MyArray[1, 2, 3].union.should be_an_instance_of(Array)
+  end
+
+  it "accepts multiple arguments" do
+    x = [1, 2, 3]
+    x.union(x, x, x, x, [3, 4], x).should == [1, 2, 3, 4]
+  end
+end