Add spec that #public_send is included in the backtrace if passed incorrect arguments

Author: eregon

spec/ruby/core/kernel/public_send_spec.rb

@@ -104,5 +104,13 @@ def bar
     }.should raise_error(NoMethodError)
   end
 
+  it "includes `public_send` in the backtrace when passed not enough arguments" do
+    -> { public_send() }.should raise_error(ArgumentError) { |e| e.backtrace[0].should.include?("`public_send'") }
+  end
+
+  it "includes `public_send` in the backtrace when passed a single incorrect argument" do
+    -> { public_send(Object.new) }.should raise_error(TypeError) { |e| e.backtrace[0].should.include?("`public_send'") }
+  end
+
   it_behaves_like :basicobject_send, :public_send
 end