Add test for updated rand_numeric functionality

Author: rastating

spec/utility/text_spec.rb

@@ -82,6 +82,15 @@
       val = Wpxf::Utility::Text.rand_numeric(10)
       expect(val).to match(/^[0-9]{10}$/)
     end
+
+    context 'when allow_leading_zero is set to false' do
+      it 'returns a value that does not start with zero' do
+        1000.times do
+          val = Wpxf::Utility::Text.rand_numeric(3, false)
+          expect(val[0]).to_not eq '0'
+        end
+      end
+    end
   end
 
   describe '.md5' do