how to express line feed in shell?

Im my debian7.8 bash shell.

str="deb http://ift.tt/17ss2fb wheezy main contrib non-free  \n  
      deb-src http://ift.tt/17ss2fb wheezy main contrib non-free  "

echo $str > test  

In my test file it is :

deb http://ift.tt/17ss2fb wheezy main contrib non-free \n deb-src http://ift.tt/17ss2fb wheezy main contrib non-free

What i want is the :

deb http://ift.tt/17ss2fb wheezy main contrib non-free 
deb-src http://ift.tt/17ss2fb wheezy main contrib non-free

how to express the line feed properly?