Replace card id with card number

test/fixtures/accounts.yml

@@ -1,7 +1,9 @@
 37s:
   name: 37signals
   external_account_id: <%= ActiveRecord::FixtureSet.identify("37signals") %>
+  cards_count: 5
 
 initech:
   name: Initech LLC
   external_account_id: <%= ActiveRecord::FixtureSet.identify("initech") %>
+  cards_count: 0

test/fixtures/cards.yml

@@ -1,4 +1,5 @@
 logo:
+  number: 1
   board: writebook
   creator: david
   column: writebook_triage
@@ -10,6 +11,7 @@ logo:
   account: 37s
 
 layout:
+  number: 2
   board: writebook
   creator: david
   column: writebook_triage
@@ -20,6 +22,7 @@ layout:
   account: 37s
 
 text:
+  number: 3
   board: writebook
   creator: kevin
   column: writebook_in_progress
@@ -30,6 +33,7 @@ text:
   account: 37s
 
 shipping:
+  number: 4
   board: writebook
   creator: kevin
   column: writebook_triage
@@ -40,6 +44,7 @@ shipping:
   account: 37s
 
 buy_domain:
+  number: 5
   board: writebook
   creator: david
   title: Buy domain

test/models/card_test.rb

@@ -5,6 +5,19 @@ class CardTest < ActiveSupport::TestCase
     Current.session = sessions(:david)
   end
 
+  test "create assigns a number to the card" do
+    user = users(:david)
+    board = boards(:writebook)
+    account = board.account
+    card = nil
+
+    assert_difference -> { account.reload.cards_count }, +1 do
+      card = Card.create!(title: "Test", board: board, creator: user)
+    end
+
+    assert_equal account.reload.cards_count, card.number
+  end
+
   test "capturing messages" do
     assert_difference -> { cards(:logo).comments.count }, +1 do
       cards(:logo).comments.create!(body: "Agreed.")