From 028c2a1b8d30c5f92eca2cb2654a9abc99bab82c Mon Sep 17 00:00:00 2001
From: Claudio Ortolina <cloud8421@gmail.com>
Date: Fri, 17 Apr 2026 13:30:04 +0100
Subject: [PATCH] Configure test coverage and enable on CI

---
 .github/workflows/test_and_deploy.yml |  2 +-
 mix.exs                               | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/test_and_deploy.yml b/.github/workflows/test_and_deploy.yml
index e45b44dc..fd2fdb47 100644
--- a/.github/workflows/test_and_deploy.yml
+++ b/.github/workflows/test_and_deploy.yml
@@ -143,7 +143,7 @@ jobs:
       - name: 🔮 Compile for TEST
         run: mix compile
       - name: 🧪 Run tests
-        run: mix test --max-cases 8
+        run: mix test --cover --export-coverage ci-run --max-cases 8
 
   deploy:
     name: Deploy
diff --git a/mix.exs b/mix.exs
index 0e5f7c74..6bb1b714 100644
--- a/mix.exs
+++ b/mix.exs
@@ -13,10 +13,30 @@ defmodule MusicLibrary.MixProject do
       deps: deps(),
       compilers: [:phoenix_live_view] ++ Mix.compilers(),
       listeners: [Phoenix.CodeReloader],
+      test_coverage: [
+        ignore_modules: ignored_coverage_modules(),
+        summary: [threshold: 75]
+      ],
       usage_rules: usage_rules()
     ]
   end
 
+  # Modules excluded from coverage accounting: cron-only workers that run
+  # operations incompatible with the Ecto sandbox (VACUUM / OPTIMIZE outside a
+  # transaction) or whose behaviour beyond a delegate call is untestable, and
+  # all Mix tasks (developer tooling not exercised by the application test
+  # suite).
+  defp ignored_coverage_modules do
+    [
+      MusicLibrary.Worker.RepoVacuum,
+      MusicLibrary.Worker.RepoOptimize,
+      MusicLibrary.Worker.SendRecordsOnThisDayEmail,
+      MusicLibrary.Worker.RefreshScrobbles,
+      MusicLibrary.Worker.BackfillScrobbledTracks,
+      ~r/^Mix\.Tasks\./
+    ]
+  end
+
   # Configuration for the OTP application.
   #
   # Type `mix help compile.app` for more information.