Rewrite Travis CI tests to Github Actions

.github/workflows/test.yml

@@ -0,0 +1,51 @@
+on: push
+name: Test
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php: [ '7.0', '7.1', '7.2', '7.3', '7.4' ]
+
+    continue-on-error: ${{ matrix.php == '7.4' }}
+
+    steps:
+      - uses: actions/checkout@master
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug2
+
+      - name: Install Dependencies
+        env:
+          COMPOSER_FLAGS: ${{ (matrix.php == '7.4') && ' --ignore-platform-reqs' || '' }}
+        run: |
+          composer install $COMPOSER_FLAGS
+
+      - name: Test
+        run: |
+          php -d error_reporting=$(php -r 'echo E_ALL & ~ E_DEPRECATED & ~ E_NOTICE;') \
+              -d xdebug.mode=coverage \
+              -d xdebug.overload_var_dump=0 \
+              vendor/bin/phpunit
+
+      - name: Upload coverage results to Coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_PARALLEL:   true
+          COVERALLS_FLAG_NAME:  PHP ${{ matrix.php }}
+        run: |
+          composer global require php-coveralls/php-coveralls
+          php-coveralls --coverage_clover=build/logs/clover.xml -v
+
+  coveralls-webhook:
+    # @see https://github.com/php-coveralls/php-coveralls#parallel-builds
+    # @see https://docs.coveralls.io/parallel-build-webhook
+    name:    Merge Coveralls parallel build results
+    runs-on: ubuntu-latest
+    needs:   test
+    steps:
+      - run: curl https://coveralls.io/webhook?repo_token=${{ secrets.GITHUB_TOKEN }}