diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 00000000..720a4894
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,96 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    continue-on-error: ${{ matrix.experimental }}
+
+    strategy:
+      matrix:
+        include:
+          - mediawiki_version: '1.35'
+            semantic_mediawiki_version: 3.2.3
+            mermaid_version: 3.0.1
+            coverage: true
+            experimental: false
+          - mediawiki_version: '1.36'
+            semantic_mediawiki_version: dev-master
+            mermaid_version: dev-master
+            coverage: false
+            experimental: true
+
+    container:
+      image: gesinn/docker-mediawiki:${{ matrix.mediawiki_version }}
+
+    env:
+      EXT_NAME: SemanticResultFormats
+      MW_INSTALL_PATH: /var/www/html
+      MW_DB_PATH: /var/www/data
+      MW_EXT_PATH: /var/www/html/extensions
+
+    steps:
+      - name: Install SemanticMediaWiki
+        run: |
+          COMPOSER=composer.local.json composer require --update-with-dependencies --working-dir ${{ env.MW_INSTALL_PATH }} mediawiki/semantic-media-wiki ${{ matrix.semantic_mediawiki_version }}
+          composer update --working-dir ${{ env.MW_INSTALL_PATH }}
+          echo "wfLoadExtension( 'SemanticMediaWiki' );" >> ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          echo "enableSemantics( 'localhost' );" >> ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          tail -n5 ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          php ${{ env.MW_INSTALL_PATH }}/maintenance/update.php --skip-external-dependencies --quick
+
+      - name: Install Mermaid
+        run: |
+          COMPOSER=composer.local.json composer require --update-with-dependencies --working-dir ${{ env.MW_INSTALL_PATH }} mediawiki/mermaid ${{ matrix.mermaid_version }}
+          composer update --working-dir ${{ env.MW_INSTALL_PATH }}
+          echo "wfLoadExtension( 'Mermaid' );" >> ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          tail -n5 ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+
+      - name: Checkout Extension
+        uses: actions/checkout@v2
+        with:
+          path: ${{ env.EXT_NAME }}
+
+      # Setting actions/checkout@v2 path to env.MW_EXT_PATH fails with "Repository path '/var/www/html/extensions' is not under ..."
+      # See also open PR https://github.com/actions/checkout/pull/388
+      - name: Move Extension
+        run: |
+          mkdir -p ${{ env.MW_EXT_PATH }}
+          mv ${{ env.EXT_NAME }} ${{ env.MW_EXT_PATH }}
+
+      - name: Install SemanticResultFormats
+        run: |
+          COMPOSER=composer.local.json composer require --no-update --working-dir ${{ env.MW_INSTALL_PATH }} mediawiki/semantic-result-formats @dev
+          COMPOSER=composer.local.json composer config repositories.semantic-result-formats '{"type": "path", "url": "extensions/SemanticResultFormats"}' --working-dir ${{ env.MW_INSTALL_PATH }}
+          composer update --working-dir ${{ env.MW_INSTALL_PATH }}
+          echo "wfLoadExtension( '${{ env.EXT_NAME }}' );" >> ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          tail -n5 ${{ env.MW_INSTALL_PATH }}/LocalSettings.php
+          php ${{ env.MW_INSTALL_PATH }}/maintenance/update.php --quick
+
+      - name: Run Tests
+        run: >
+          php ${{ env.MW_INSTALL_PATH }}/tests/phpunit/phpunit.php
+          --configuration ${{ env.MW_EXT_PATH }}/${{ env.EXT_NAME }}
+          --testdox
+        if: matrix.coverage == false
+
+      - name: Run Tests With Coverage
+        run: >
+          php ${{ env.MW_INSTALL_PATH }}/tests/phpunit/phpunit.php
+          --configuration ${{ env.MW_EXT_PATH }}/${{ env.EXT_NAME }}
+          --testdox
+          --coverage-clover ${{ env.MW_INSTALL_PATH }}/docs/coverage.xml
+        if: matrix.coverage == true
+
+      - name: Upload code coverage
+        uses: codecov/codecov-action@v2
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ${{ env.MW_INSTALL_PATH }}/docs/coverage.xml
+        if: matrix.coverage == true
diff --git a/composer.json b/composer.json
index 34164c93..d688dd18 100644
--- a/composer.json
+++ b/composer.json
@@ -88,8 +88,8 @@
 		"test-coverage": [
 			"@phpunit-coverage"
 		],
-		"phpunit": "php ../../tests/phpunit/phpunit.php -c phpunit.xml.dist",
-		"phpunit-coverage": "php ../../tests/phpunit/phpunit.php -c phpunit.xml.dist --testdox --coverage-text --coverage-html coverage/php --coverage-clover coverage/php/coverage.xml",
+		"phpunit": "php ${MW_INSTALL_PATH:-../..}/tests/phpunit/phpunit.php -c phpunit.xml.dist",
+		"phpunit-coverage": "php ${MW_INSTALL_PATH:-../..}/tests/phpunit/phpunit.php -c phpunit.xml.dist --testdox --coverage-text --coverage-html coverage/php --coverage-clover coverage/php/coverage.xml",
 		"integration": "composer phpunit -- --testsuite=semantic-result-formats-integration",
 		"lint": [
 			"@parallel-lint",