update blog post, and run credo with 'pi'

app/test/firehose_web/controllers/blog_test.exs

@@ -74,7 +74,7 @@ defmodule FirehoseWeb.BlogTest do
       conn = get(conn, "/api/blog/engineering")
       assert %{"blog" => "engineering", "posts" => posts} = json_response(conn, 200)
       assert is_list(posts)
-      assert length(posts) > 0
+      refute Enum.empty?(posts)
     end
 
     test "GET /api/blog/engineering/:slug returns a post", %{conn: conn} do
@@ -99,7 +99,7 @@ defmodule FirehoseWeb.BlogTest do
       conn = get(conn, "/api/blog/releases")
       assert %{"blog" => "release_notes", "posts" => posts} = json_response(conn, 200)
       assert is_list(posts)
-      assert length(posts) > 0
+      refute Enum.empty?(posts)
     end
 
     test "GET /api/blog/releases/:slug returns a post", %{conn: conn} do

app/test/support/data_case.ex

@@ -18,6 +18,7 @@ defmodule Firehose.DataCase do
 
   using do
     quote do
+      alias Ecto.Adapters.SQL.Sandbox
       alias Firehose.Repo
 
       import Ecto
@@ -36,8 +37,8 @@ defmodule Firehose.DataCase do
   Sets up the sandbox based on the test tags.
   """
   def setup_sandbox(tags) do
-    pid = Ecto.Adapters.SQL.Sandbox.start_owner!(Firehose.Repo, shared: not tags[:async])
-    on_exit(fn -> Ecto.Adapters.SQL.Sandbox.stop_owner(pid) end)
+    pid = Sandbox.start_owner!(Firehose.Repo, shared: not tags[:async])
+    on_exit(fn -> Sandbox.stop_owner(pid) end)
   end
 
   @doc """