Fix credo warnings: length/1 on list and nested module aliases

- skew_t_test: replace length(list) > 0 with list != []
- conn_case: alias DataCase, GridCache, ScoreCache at top

test/microwaveprop_web/skew_t_test.exs

@@ -99,10 +99,10 @@ defmodule MicrowavepropWeb.SkewTTest do
       assert chart.width > 0
       assert chart.height > 0
       # Background grid
-      assert length(chart.isobars) > 0
+      assert chart.isobars != []
-      assert length(chart.isotherms) > 0
+      assert chart.isotherms != []
-      assert length(chart.dry_adiabats) > 0
+      assert chart.dry_adiabats != []
-      assert length(chart.mixing_ratio_lines) > 0
+      assert chart.mixing_ratio_lines != []
       # Traces
       assert chart.t_points != []
       assert chart.td_points != []

test/support/conn_case.ex

@@ -20,6 +20,9 @@ defmodule MicrowavepropWeb.ConnCase do
   alias Microwaveprop.Accounts
   alias Microwaveprop.Accounts.Scope
   alias Microwaveprop.AccountsFixtures
+  alias Microwaveprop.DataCase
+  alias Microwaveprop.Propagation.ScoreCache
+  alias Microwaveprop.Weather.GridCache
 
   using do
     quote do
@@ -36,10 +39,10 @@ defmodule MicrowavepropWeb.ConnCase do
   end
 
   setup tags do
-    Microwaveprop.DataCase.setup_sandbox(tags)
+    DataCase.setup_sandbox(tags)
-    Microwaveprop.DataCase.reset_score_files()
+    DataCase.reset_score_files()
-    Microwaveprop.Weather.GridCache.clear()
+    GridCache.clear()
-    Microwaveprop.Propagation.ScoreCache.clear()
+    ScoreCache.clear()
     {:ok, conn: Phoenix.ConnTest.build_conn()}
   end