Check below xml field to set default value.
<?xml version="1.0"?>
<config>
<tabs>
<facebook translate="label" module="facebook">
<label>Facebook</label>
<sort_order>0</sort_
describe Array do
describe "#sum" do
it "has a #sum method" do
expect([]).to respond_to(:sum)
end
it "should be 0 for an empty array" do
expect([].sum).to eq(0)
e