diff --git a/.github/workflows/infection.yml b/.github/workflows/infection.yml
new file mode 100644
index 0000000..89b091b
--- /dev/null
+++ b/.github/workflows/infection.yml
@@ -0,0 +1,57 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    name: ci
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        moodle-branch: ['main']
+        php: ['8.3']
+        database: ['mysqli']
+
+    steps:
+      - name: checkout plugin
+        uses: actions/checkout@v4
+        with:
+          path: this-plugin
+
+      - name: setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          ini-values: max_input_vars=5000
+          tools: infection, phpunit
+          coverage: pcov
+
+      - name: composer
+        run: |
+           composer create-project -n --no-dev --prefer-dist moodlehq/moodle-plugin-ci ci
+           echo $(cd ci/bin; pwd) >> $GITHUB_PATH
+           echo $(cd ci/vendor/bin; pwd) >> $GITHUB_PATH
+           sudo locale-gen en_AU.UTF-8
+           sudo systemctl start mysql.service
+           curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash
+
+      - name: install Moodle
+        run: moodle-plugin-ci install --db-user=root --db-pass=root --db-host=127.0.0.1 --plugin this-plugin
+        env:
+          DB: ${{ matrix.database }}
+          MOODLE_BRANCH: ${{ matrix.moodle-branch }}
+
+      - name: autoload
+        working-directory: moodle
+        run: |
+           echo '<?php' > vendor/autoloadmoodle.php
+           echo 'define("PHPUNIT_UTIL", true);' >> vendor/autoloadmoodle.php
+           echo 'require(__DIR__ . "/../lib/phpunit/bootstrap.php");' >> vendor/autoloadmoodle.php
+           echo 'require("autoload.php");' >> vendor/autoloadmoodle.php
+
+      - name: infection
+        if: ${{ !cancelled() }}
+        run: infection -s --only-covered --configuration=availability/condition/relativedate/.infection.json5
+        working-directory: moodle