patch lab 03 from feedback

labs/03/card/test/card_test.exs

@@ -1,8 +1,29 @@
 defmodule CardTest do
   use ExUnit.Case
-  doctest Card
 
-  test "greets the world" do
-    assert Card.hello() == :world
+  setup do
+    {:ok, pid} = Card.Worker.start()
+    on_exit(fn ->
+      if Process.alive?(pid), do: GenServer.stop(pid)
+    end)
+
+    :ok
+  end
+
+  test "the server creates a fresh deck when it starts" do
+    assert Card.Worker.count() == 52
+  end
+
+  test "dealing removes cards from the server's deck" do
+    assert {:ok, cards} = Card.Worker.deal(5)
+    assert length(cards) == 5
+    assert Card.Worker.count() == 47
+  end
+
+  test "new replaces the current deck with a fresh deck" do
+    assert {:ok, _cards} = Card.Worker.deal(5)
+    Card.Worker.new()
+
+    assert Card.Worker.count() == 52
   end
 end