Add unit tests (#133)

* Add initial test & add pipeline

* Add very basic YAML config tests

* Add coverage reporting

* Add some webserver & template loading tests

* Add test cases for the helpers

* Implement initial OIDC server tests

* Test codestore & discovery checker

* Test basics of the config flow

* Add test for the HA auth provider

* Cleaned up tests & test injection

.github/workflows/test.yaml

@@ -0,0 +1,24 @@
+---
+name: Tests (pytest)
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: "Set up Python"
+        uses: actions/setup-python@v6
+        with:
+          python-version-file: ".python-version"
+      - name: Install the latest version of uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+      - name: Sync dependencies
+        run: scripts/sync
+      - name: Test
+        run: scripts/test