1 files changed, 26 insertions, 2 deletions
diff --git a/spec/ruby/core/numeric/real_spec.rb b/spec/ruby/core/numeric/real_spec.rb
index d5d6a097f9..8c318dce0f 100644
--- a/spec/ruby/core/numeric/real_spec.rb
+++ b/spec/ruby/core/numeric/real_spec.rb
@@ -1,9 +1,33 @@
 require_relative '../../spec_helper'
-require_relative '../../shared/complex/numeric/real'
 require_relative 'fixtures/classes'
 
 describe "Numeric#real" do
-  it_behaves_like :numeric_real, :real
+  before :each do
+    @numbers = [
+      20,             # Integer
+      398.72,         # Float
+      Rational(3, 4), # Rational
+      bignum_value,   # Bignum
+      infinity_value,
+      nan_value
+    ].map{ |n| [n, -n] }.flatten
+  end
+
+  it "returns self" do
+    @numbers.each do |number|
+      if number.to_f.nan?
+        number.real.nan?.should be_true
+      else
+        number.real.should == number
+      end
+    end
+  end
+
+  it "raises an ArgumentError if given any arguments" do
+    @numbers.each do |number|
+      lambda { number.real(number) }.should raise_error(ArgumentError)
+    end
+  end
 end
 
 describe "Numeric#real?" do