Add Makefile test target for running PHPUnit inside container

Supports:
  make test              # all suites (Unit, Integration, DatabasePortability)
  make test suite=Unit
  make test suite=Integration
  make test suite=DatabasePortability

Also switches composer to install dev dependencies so PHPUnit is available.

Makefile

@@ -1,11 +1,12 @@
 .PHONY: build deps up down setup deploy redeploy logs clean package release \
        up-postgres setup-postgres deploy-postgres clean-postgres \
-       up-sqlite setup-sqlite deploy-sqlite clean-sqlite
+       up-sqlite setup-sqlite deploy-sqlite clean-sqlite \
+       test
 
 # Install dependencies (composer via Docker since PHP may not be local)
 deps:
 	npm install --no-audit --no-fund
-	docker run --rm -v "$$(pwd):/app" -w /app composer:2 install --no-dev --optimize-autoloader --no-interaction
+	docker run --rm -v "$$(pwd):/app" -w /app composer:2 install --optimize-autoloader --no-interaction
 
 # Build frontend
 build: deps
@@ -202,6 +203,38 @@ deploy-sqlite: build up-sqlite setup-sqlite
 clean-sqlite:
 	docker compose -f docker/sqlite/docker-compose.yml down -v
 
+# Run all tests inside the Nextcloud container
+# Supports: make test [suite=Unit] [suite=Integration] [suite=DatabasePortability]
+test:
+	@if ! docker compose exec -T nextcloud test -f config/config.php 2>/dev/null; then \
+		echo "ERROR: Nextcloud container is not running."; \
+		echo "  Start it with: make up && make setup"; \
+		exit 1; \
+	fi
+	@# Ensure app code is up to date inside the container
+	docker compose exec nextcloud cp -a /app-src/appinfo /var/www/html/custom_apps/mitgliederverwaltung/
+	docker compose exec nextcloud cp -a /app-src/lib /var/www/html/custom_apps/mitgliederverwaltung/
+	docker compose exec nextcloud cp -a /app-src/tests /var/www/html/custom_apps/mitgliederverwaltung/
+	docker compose exec nextcloud cp -a /app-src/phpunit.xml /var/www/html/custom_apps/mitgliederverwaltung/
+	docker compose exec nextcloud chown -R www-data:www-data /var/www/html/custom_apps/mitgliederverwaltung
+	@# Copy composer vendor dir with dev deps into app for PHPUnit
+	docker compose exec nextcloud cp -a /app-src/vendor /var/www/html/custom_apps/mitgliederverwaltung/
+	@# Determine which test suite to run (default: all)
+	@if [ "$(suite)" = "" ]; then \
+		echo "Running all tests..."; \
+		docker compose exec -u www-data -T nextcloud \
+			php /var/www/html/custom_apps/mitgliederverwaltung/vendor/bin/phpunit \
+			-c /var/www/html/custom_apps/mitgliederverwaltung/phpunit.xml \
+			--colors=always; \
+	else \
+		echo "Running suite $(suite)..."; \
+		docker compose exec -u www-data -T nextcloud \
+			php /var/www/html/custom_apps/mitgliederverwaltung/vendor/bin/phpunit \
+			-c /var/www/html/custom_apps/mitgliederverwaltung/phpunit.xml \
+			--testsuite $(suite) \
+			--colors=always; \
+	fi
+
 # Remove volumes (full reset)
 clean:
 	docker compose down -v