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diff --git a/spec/rubyspec/shared/complex/plus.rb b/spec/rubyspec/shared/complex/plus.rb
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+++ b/spec/rubyspec/shared/complex/plus.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe :complex_plus, shared: true do
+  describe "with Complex" do
+    it "adds both the real and imaginary components" do
+      (Complex(1, 2) + Complex(10, 20)).should == Complex(1 + 10, 2 + 20)
+      (Complex(1.5, 2.1) + Complex(100.2, -30.3)).should == Complex(1.5 + 100.2, 2.1 + (-30.3))
+    end
+  end
+
+  describe "with Integer" do
+    it "adds the real number to the real component of self" do
+      (Complex(1, 2) + 50).should == Complex(51, 2)
+      (Complex(1, 2) + 50.5).should == Complex(51.5, 2)
+    end
+  end
+
+  describe "with Object" do
+    it "tries to coerce self into other" do
+      value = Complex(3, 9)
+
+      obj = mock("Object")
+      obj.should_receive(:coerce).with(value).and_return([2, 5])
+      (value + obj).should == 2 + 5
+    end
+  end
+
+  describe "passed Numeric which responds to #real? with true" do
+    it "coerces the passed argument to the type of the real part and adds the resulting elements" do
+      n = mock_numeric('n')
+      n.should_receive(:real?).and_return(true)
+      n.should_receive(:coerce).with(1).and_return([1, 4])
+      (Complex(1, 2) + n).should == Complex(5, 2)
+    end
+  end
+
+  describe "passed Numeric which responds to #real? with false" do
+    it "coerces the passed argument to Complex and adds the resulting elements" do
+      n = mock_numeric('n')
+      n.should_receive(:real?).and_return(false)
+      n.should_receive(:coerce).with(Complex(1, 2)).and_return([Complex(1, 2), Complex(3, 4)])
+      (Complex(1, 2) + n).should == Complex(4, 6)
+    end
+  end
+end