diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
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+++ b/.github/workflows/ci.yml
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+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+  - "pull_request"
+  - "push"
+
+name: "CI"
+
+jobs:
+  coding-guidelines:
+    name: "Coding Guidelines"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Run friendsofphp/php-cs-fixer"
+        run: "php ./tools/php-cs-fixer fix --dry-run --show-progress=dots --using-cache=no --verbose"
+
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version:
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+          - "8.1"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP with extensions"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "${{ matrix.php-version }}"
+          coverage: "pcov"
+
+      - name: "Cache dependencies installed with composer"
+        uses: "actions/cache@v1"
+        with:
+          path: "~/.composer/cache"
+          key: "php${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.json') }}"
+          restore-keys: "php${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-"
+
+      - name: "Install dependencies with composer"
+        run: "./tools/composer update --no-ansi --no-interaction --no-progress"
+
+      - name: "Run tests with phpunit/phpunit"
+        run: "vendor/bin/phpunit --coverage-clover=coverage.xml"
+
+      - name: "Send code coverage report to Codecov.io"
+        env:
+          CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
+        run: "bash <(curl -s https://codecov.io/bash) || true"
diff --git a/.phive/phars.xml b/.phive/phars.xml
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--- /dev/null
+++ b/.phive/phars.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<phive xmlns="https://phar.io/phive">
+  <phar name="php-cs-fixer" version="^3.0" installed="3.2.1" location="./tools/php-cs-fixer" copy="true"/>
+  <phar name="composer" version="^2.0.3" installed="2.1.12" location="./tools/composer" copy="true"/>
+</phive>
diff --git a/tools/composer b/tools/composer
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diff --git a/tools/php-cs-fixer b/tools/php-cs-fixer
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