fix: resolve test suite warnings-as-errors failures

- conn_case: remove compile-time alias for AccountsFixtures to fix compilation ordering warning
- hrdps_client_test: clear global hrdps_cycle_available_fn in test setup so injected http_head takes effect (2 previously failing tests)
- test_helper: use Code.ensure_loaded!/1 instead of Code.require_file to avoid redefining module warnings
- mix.exs: add test_ignore_filters to suppress Elixir 1.20 test support file warnings

mix.exs

@@ -17,6 +17,7 @@ defmodule Microwaveprop.MixProject do
       compilers: [:phoenix_live_view] ++ Mix.compilers(),
       listeners: [Phoenix.CodeReloader],
       test_coverage: [summary: [threshold: 85]],
+      test_ignore_filters: [~r"test/support/"],
       # Disable protocol consolidation in test so test-only deps
       # (lazy_html) that implement core protocols (Enumerable) are
       # dispatched at runtime instead of failing at compile-time

test/microwaveprop/weather/hrdps_client_test.exs

@@ -153,12 +153,20 @@ defmodule Microwaveprop.Weather.HrdpsClientTest do
 
   describe "cycle_available?/1 (injected http_head)" do
     setup do
-      prev = Application.get_env(:microwaveprop, :hrdps_http_head)
+      prev_head = Application.get_env(:microwaveprop, :hrdps_http_head)
+      prev_fn = Application.get_env(:microwaveprop, :hrdps_cycle_available_fn)
+
+      # Clear the global cycle_available_fn so cycle_available?/1 falls
+      # through to probe_cycle/1, which reads the injected http_head.
+      Application.delete_env(:microwaveprop, :hrdps_cycle_available_fn)
 
       on_exit(fn ->
-        if prev,
-          do: Application.put_env(:microwaveprop, :hrdps_http_head, prev),
+        if prev_head,
+          do: Application.put_env(:microwaveprop, :hrdps_http_head, prev_head),
           else: Application.delete_env(:microwaveprop, :hrdps_http_head)
+
+        if prev_fn,
+          do: Application.put_env(:microwaveprop, :hrdps_cycle_available_fn, prev_fn)
       end)
 
       :ok

test/test_helper.exs

@@ -11,11 +11,19 @@ end
 # starts lazily compiling the test suite. The parallel compiler workers
 # inherit the code server state, so loading them here makes them visible
 # everywhere.
-Code.require_file("test/support/data_case.ex")
-Code.require_file("test/support/conn_case.ex")
-Code.require_file("test/support/fixtures/accounts_fixtures.ex")
-Code.require_file("test/support/fixtures/beacons_fixtures.ex")
-Code.require_file("test/support/fixtures/contacts_fixtures.ex")
+# Use ensure_loaded!/1 (not require_file) because mix compile already
+# compiles these into _build — require_file recompiles them redundantly
+# and triggers "redefining module" warnings that fail --warnings-as-errors.
+Enum.each(
+  [
+    Microwaveprop.DataCase,
+    MicrowavepropWeb.ConnCase,
+    Microwaveprop.AccountsFixtures,
+    Microwaveprop.BeaconsFixtures,
+    Microwaveprop.ContactsFixtures
+  ],
+  &Code.ensure_loaded!/1
+)
 
 ExUnit.start()