diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a0dbe4f..2cd74f7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,20 +1,268 @@
-name: CI
+name: PHPUnit
 
-on: [push]
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - stable*
+
+env:
+  APP_NAME: gpoddersync
 
 jobs:
-  build-test:
+  php:
     runs-on: ubuntu-latest
 
+    strategy:
+      # do not stop on another job's failure
+      fail-fast: false
+      matrix:
+        php-versions: ['7.4']
+        databases: ['sqlite']
+        server-versions: ['stable22']
+
+    name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
+
     steps:
-      - uses: actions/checkout@v2
-
-      - uses: php-actions/composer@v5
-
-      - name: PHPUnit Tests
-        uses: php-actions/phpunit@v2
-        env:
-          TEST_NAME: Scarlett
+      - name: Checkout server
+        uses: actions/checkout@v2
         with:
-          bootstrap: vendor/autoload.php
-          configuration: test/phpunit.xml
+          repository: nextcloud/server
+          ref: ${{ matrix.server-versions }}
+
+      - name: Checkout submodules
+        shell: bash
+        run: |
+          auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+          git submodule sync --recursive
+          git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+
+      - name: Checkout app
+        uses: actions/checkout@v2
+        with:
+          path: apps/${{ env.APP_NAME }}
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: phpunit:8.5.14
+          extensions: mbstring, iconv, fileinfo, intl, sqlite, pdo_sqlite, gd, zip
+          coverage: none
+
+      - name: Set up PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: composer i
+
+      - name: Set up Nextcloud
+        env:
+          DB_PORT: 4444
+        run: |
+          mkdir data
+          ./occ maintenance:install --verbose --database=${{ matrix.databases }} --database-name=nextcloud --database-host=127.0.0.1 --database-port=$DB_PORT --database-user=root --database-pass=rootpassword --admin-user admin --admin-pass password
+          php -f index.php
+          ./occ app:enable --force ${{ env.APP_NAME }}
+          php -S localhost:8080 &
+
+      - name: PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: phpunit -c tests/phpunit.xml
+
+  mysql:
+    runs-on: ubuntu-latest
+
+    strategy:
+      # do not stop on another job's failure
+      fail-fast: false
+      matrix:
+        php-versions: ['7.4']
+        databases: ['mysql']
+        server-versions: ['stable22']
+
+    name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
+
+    services:
+      mysql:
+        image: mariadb:10.5
+        ports:
+          - 4444:3306/tcp
+        env:
+          MYSQL_ROOT_PASSWORD: rootpassword
+        options: --health-cmd="mysqladmin ping" --health-interval 5s --health-timeout 2s --health-retries 5
+
+    steps:
+      - name: Checkout server
+        uses: actions/checkout@v2
+        with:
+          repository: nextcloud/server
+          ref: ${{ matrix.server-versions }}
+
+      - name: Checkout submodules
+        shell: bash
+        run: |
+          auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+          git submodule sync --recursive
+          git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+
+      - name: Checkout app
+        uses: actions/checkout@v2
+        with:
+          path: apps/${{ env.APP_NAME }}
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: phpunit:8.5.14
+          extensions: mbstring, iconv, fileinfo, intl, mysql, pdo_mysql, gd, zip
+          coverage: none
+
+      - name: Set up PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: composer i
+
+      - name: Set up Nextcloud
+        env:
+          DB_PORT: 4444
+        run: |
+          mkdir data
+          ./occ maintenance:install --verbose --database=${{ matrix.databases }} --database-name=nextcloud --database-host=127.0.0.1 --database-port=$DB_PORT --database-user=root --database-pass=rootpassword --admin-user admin --admin-pass password
+          php -f index.php
+          ./occ app:enable --force ${{ env.APP_NAME }}
+          php -S localhost:8080 &
+
+      - name: PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: phpunit -c tests/phpunit.xml
+
+  pgsql:
+    runs-on: ubuntu-latest
+
+    strategy:
+      # do not stop on another job's failure
+      fail-fast: false
+      matrix:
+        php-versions: ['7.4']
+        databases: ['pgsql']
+        server-versions: ['stable22']
+
+    name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
+
+    services:
+      postgres:
+        image: postgres
+        ports:
+          - 4444:5432/tcp
+        env:
+          POSTGRES_USER: root
+          POSTGRES_PASSWORD: rootpassword
+          POSTGRES_DB: nextcloud
+        options: --health-cmd pg_isready --health-interval 5s --health-timeout 2s --health-retries 5
+
+    steps:
+      - name: Checkout server
+        uses: actions/checkout@v2
+        with:
+          repository: nextcloud/server
+          ref: ${{ matrix.server-versions }}
+
+      - name: Checkout submodules
+        shell: bash
+        run: |
+          auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+          git submodule sync --recursive
+          git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+
+      - name: Checkout app
+        uses: actions/checkout@v2
+        with:
+          path: apps/${{ env.APP_NAME }}
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          tools: phpunit:8.5.14
+          extensions: mbstring, iconv, fileinfo, intl, pgsql, pdo_pgsql, gd, zip
+          coverage: none
+
+      - name: Set up PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: composer i
+
+      - name: Set up Nextcloud
+        env:
+          DB_PORT: 4444
+        run: |
+          mkdir data
+          ./occ maintenance:install --verbose --database=${{ matrix.databases }} --database-name=nextcloud --database-host=127.0.0.1 --database-port=$DB_PORT --database-user=root --database-pass=rootpassword --admin-user admin --admin-pass password
+          php -f index.php
+          ./occ app:enable --force ${{ env.APP_NAME }}
+          php -S localhost:8080 &
+
+      - name: PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: phpunit -c tests/phpunit.xml
+
+  oci:
+    runs-on: ubuntu-latest
+
+    strategy:
+      # do not stop on another job's failure
+      fail-fast: false
+      matrix:
+        php-versions: ['7.4']
+        databases: ['oci']
+        server-versions: ['master']
+
+    name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
+
+    services:
+      oracle:
+        image: deepdiver/docker-oracle-xe-11g
+        ports:
+          - "1521:1521"
+
+    steps:
+      - name: Checkout server
+        uses: actions/checkout@v2
+        with:
+          repository: nextcloud/server
+          ref: ${{ matrix.server-versions }}
+
+      - name: Checkout submodules
+        shell: bash
+        run: |
+          auth_header="$(git config --local --get http.https://github.com/.extraheader)"
+          git submodule sync --recursive
+          git -c "http.extraheader=$auth_header" -c protocol.version=2 submodule update --init --force --recursive --depth=1
+
+      - name: Checkout app
+        uses: actions/checkout@v2
+        with:
+          path: apps/${{ env.APP_NAME }}
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "${{ matrix.php-versions }}"
+          extensions: mbstring, iconv, fileinfo, intl, oci8
+          tools: phpunit:8.5.14
+          coverage: none
+
+      - name: Set up PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: composer i
+
+      - name: Set up Nextcloud
+        run: |
+          mkdir data
+          ./occ maintenance:install --verbose --database=oci --database-name=XE --database-host=127.0.0.1 --database-port=1521 --database-user=autotest --database-pass=owncloud --admin-user admin --admin-pass admin
+          php -f index.php
+          ./occ app:enable --force ${{ env.APP_NAME }}
+          php -S localhost:8080 &
+
+      - name: PHPUnit
+        working-directory: apps/${{ env.APP_NAME }}
+        run: phpunit -c tests/phpunit.xml