1 files changed, 41 insertions, 0 deletions
diff --git a/spec/ruby/core/numeric/singleton_method_added_spec.rb b/spec/ruby/core/numeric/singleton_method_added_spec.rb
new file mode 100644
index 0000000000..a650d286f2
--- /dev/null
+++ b/spec/ruby/core/numeric/singleton_method_added_spec.rb
@@ -0,0 +1,41 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Numeric#singleton_method_added" do
+  before :all do
+    class ::NumericSpecs::Subclass
+      # We want restore default Numeric behaviour for this particular test
+      remove_method :singleton_method_added
+    end
+  end
+
+  after :all do
+    class ::NumericSpecs::Subclass
+      # Allow mocking methods again
+      def singleton_method_added(val)
+      end
+    end
+  end
+
+  it "raises a TypeError when trying to define a singleton method on a Numeric" do
+    lambda do
+      a = NumericSpecs::Subclass.new
+      def a.test; end
+    end.should raise_error(TypeError)
+
+    lambda do
+      a = 1
+      def a.test; end
+    end.should raise_error(TypeError)
+
+    lambda do
+      a = 1.5
+      def a.test; end
+    end.should raise_error(TypeError)
+
+    lambda do
+      a = bignum_value
+      def a.test; end
+    end.should raise_error(TypeError)
+  end
+end