added context tests for the cart module

lib/elixir_conf_africa/cart.ex

@@ -9,7 +9,7 @@ defmodule ElixirConfAfrica.Cart do
     cart |> Enum.map(fn cart_item -> cart_item.id end)
   end
 
-  def add_quantity_to_cart_item(cart_item, quantity) do
+  def increase_cart_item_quantity(cart_item, quantity) do
     cart_item
     |> Map.put(:quantity, quantity)
   end
@@ -47,13 +47,12 @@ defmodule ElixirConfAfrica.Cart do
   def add_quantity_to_cart_item(cart, cart_item, quantity) do
     case cart |> Enum.filter(fn item -> item.id == cart_item.id end) do
       [] ->
-        cart_item
-        |> Map.put(:quantity, quantity)
+        increase_cart_item_quantity(cart_item, quantity)
 
       _ ->
         cart
         |> Enum.filter(fn item -> item.id == cart_item.id end)
-        |> Enum.map(fn item -> add_quantity_to_cart_item(item, item.quantity + 1) end)
+        |> Enum.map(fn item -> increase_cart_item_quantity(item, item.quantity + 1) end)
         |> List.first()
     end
   end

test/elixir_conf_africa/cart_test.exs

@@ -0,0 +1,51 @@
+defmodule ElixirConfAfrica.CartTest do
+  use ElixirConfAfrica.DataCase
+  alias ElixirConfAfrica.Cart
+
+  describe "Cart Functionaity" do
+    import ElixirConfAfrica.Factory
+
+    setup do
+      event = insert!(:elixir_conf_event)
+      ticket_type = insert!(:elixir_conf_ticket_type, event_id: event.id)
+
+      [ticket_type: ticket_type]
+    end
+
+    test "cart_list_ids/1  returns all ids from the carts in a list" do
+      assert Cart.cart_list_ids([%{id: 1}, %{id: 2}]) == [1, 2]
+    end
+
+    test "increase_cart_item_quantity/2 increases the quantity of a cart item" do
+      assert Cart.increase_cart_item_quantity(%{quantity: 1}, 2) == %{quantity: 2}
+    end
+
+    test "add quantity to cart_item/3 returns the cart item with an increased quantity " do
+      assert Cart.add_quantity_to_cart_item([%{id: 1, quantity: 1}], %{id: 1, quantity: 1}, 2) ==
+               %{id: 1, quantity: 2}
+
+      assert Cart.add_quantity_to_cart_item([%{id: 1, quantity: 1}], %{id: 2}, 1) ==
+               %{id: 2, quantity: 1}
+    end
+
+    test "get_updated_cart/3 returns the updated cart" do
+      assert Cart.get_updated_cart("in-cart", %{id: 1, quantity: 1}, [%{id: 1, quantity: 1}]) ==
+               [%{id: 1, quantity: 2}]
+
+      assert Cart.get_updated_cart("out-of-cart", %{id: 2}, [%{id: 1, quantity: 1}]) ==
+               [%{id: 2, quantity: 1}, %{id: 1, quantity: 1}]
+    end
+
+    test "add_to_cart/2 adds an item to the cart", %{ticket_type: ticket_type} do
+      assert Cart.add_to_cart([%{id: 1, quantity: 1}, %{id: 2, quantity: 1}], 1) ==
+               [%{id: 2, quantity: 1}, %{id: 1, quantity: 2}]
+
+      assert Cart.add_to_cart([%{id: 1, quantity: 1}, %{id: 2, quantity: 1}], ticket_type.id) ==
+               [
+                 ticket_type |> Map.put(:quantity, 1),
+                 %{id: 1, quantity: 1},
+                 %{id: 2, quantity: 1}
+               ]
+    end
+  end
+end

test/elixir_conf_africa/events_test.exs

@@ -8,7 +8,7 @@ defmodule ElixirConfAfrica.EventsTest do
     alias ElixirConfAfrica.Events.Event
 
     @invalid_attrs %{
-      name: nil,
+      name: nil, 
       description: nil,
       location: nil,
       event_type: nil,