Add tests

[hassansin]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@cb37117). Click here to learn what that means.
The diff coverage is 92.3%.

@@            Coverage Diff            @@
##             master      #16   +/-   ##
=========================================
  Coverage          ?   88.09%           
  Complexity        ?       71           
=========================================
  Files             ?        8           
  Lines             ?      252           
  Branches          ?        0           
=========================================
  Hits              ?      222           
  Misses            ?       30           
  Partials          ?        0

Impacted Files	Coverage Δ	Complexity Δ
...migrations/2015_11_03_155308_create_cart_table.php	100% <100%> (ø)	2 <0> (?)
src/Hassansin/DBCart/Models/CartLine.php	97.72% <100%> (ø)	13 <0> (?)
.../Hassansin/DBCart/Console/Commands/CartCleanup.php	100% <100%> (ø)	4 <0> (?)
src/Hassansin/DBCart/config/cart.php	100% <100%> (ø)	0 <0> (?)
src/Hassansin/DBCart/Models/Cart.php	78.9% <89.83%> (ø)	44 <18> (?)
src/Hassansin/DBCart/CartServiceProvider.php	92.59% <92%> (ø)	5 <4> (?)

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