diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..a28973c
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,85 @@
+name: Tests
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php:
+          - 7.1
+          - 7.2
+          - 7.3
+          - 7.4
+
+      fail-fast: false
+
+    name: PHP ${{ matrix.php }} tests
+    steps:
+      - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      - name: Add NewRelic APT source
+        run: echo 'deb http://apt.newrelic.com/debian/ newrelic non-free' | sudo tee /etc/apt/sources.list.d/newrelic.list
+      - name: Add NewRelic APT key
+        run: wget -O- https://download.newrelic.com/548C16BF.gpg | sudo apt-key add -
+      - name: Update APT
+        run: sudo apt-get update
+      - name: Install NewRelic PHP extension
+        run: sudo apt-get -y install newrelic-php5
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - uses: actions/cache@v1
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - run: composer install --no-progress --prefer-dist
+      - run: composer tests
+      - if: failure()
+        run: for i in $(find tests -name \*.actual); do echo "--- $i"; cat $i; echo; echo; done
+        shell: bash
+
+
+  lowest_dependencies:
+    name: Lowest Dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@v1
+        with:
+          php-version: 7.1
+          coverage: none
+
+      - name: Add NewRelic APT source
+        run: echo 'deb http://apt.newrelic.com/debian/ newrelic non-free' | sudo tee /etc/apt/sources.list.d/newrelic.list
+      - name: Add NewRelic APT key
+        run: wget -O- https://download.newrelic.com/548C16BF.gpg | sudo apt-key add -
+      - name: Update APT
+        run: sudo apt-get update
+      - name: Install NewRelic PHP extension
+        run: sudo apt-get -y install newrelic-php5
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+      - uses: actions/cache@v1
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - run: composer update --no-progress --prefer-dist --prefer-lowest --prefer-stable
+      - run: composer tests
+      - if: failure()
+        run: for i in $(find tests -name \*.actual); do echo "--- $i"; cat $i; echo; echo; done
+        shell: bash
diff --git a/composer.json b/composer.json
index 3dc8324..6a2f84b 100644
--- a/composer.json
+++ b/composer.json
@@ -30,17 +30,24 @@
 	},
 	"require-dev": {
 		"php-parallel-lint/php-parallel-lint": "^1.2",
-		"ninjify/coding-standard": "^0.10.0"
+		"ninjify/coding-standard": "^0.10.0",
+		"ninjify/nunjuck": "^0.3.0"
 	},
 	"autoload": {
 		"psr-4": {
 			"Contributte\\NewRelic\\": "src"
 		}
 	},
+	"autoload-dev": {
+		"psr-4": {
+			"ContributteTests\\NewRelic\\": "tests"
+		}
+	},
 	"scripts": {
 		"lint": "vendor/bin/parallel-lint -e php,phpt src",
 		"cs": "vendor/bin/phpcs --standard=vendor/ninjify/coding-standard/ruleset-gamee.xml --extensions=php,phpt --tab-width=4 -sp src",
-		"csfix": "vendor/bin/phpcbf --standard=vendor/ninjify/coding-standard/ruleset-gamee.xml --extensions=php,phpt --tab-width=4 -sp src"
+		"csfix": "vendor/bin/phpcbf --standard=vendor/ninjify/coding-standard/ruleset-gamee.xml --extensions=php,phpt --tab-width=4 -sp src",
+		"tests": "vendor/bin/tester -s -p php --colors 1 -C tests/Cases"
 	},
 	"archive": {
 		"exclude": [
diff --git a/tests/.gitignore b/tests/.gitignore
new file mode 100644
index 0000000..ceeb05b
--- /dev/null
+++ b/tests/.gitignore
@@ -0,0 +1 @@
+/tmp
diff --git a/tests/Cases/NewRelicExtensionTest.php b/tests/Cases/NewRelicExtensionTest.php
new file mode 100644
index 0000000..cb23862
--- /dev/null
+++ b/tests/Cases/NewRelicExtensionTest.php
@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace ContributteTests\NewRelic\Cases;
+
+use Contributte\NewRelic\Callbacks\OnErrorCallback;
+use Contributte\NewRelic\Callbacks\OnRequestCallback;
+use Contributte\NewRelic\DI\NewRelicExtension;
+use ContributteTests\NewRelic\Mocks\ApplicationExtension;
+use Nette\DI\Compiler;
+use Nette\DI\Container;
+use Nette\DI\ContainerLoader;
+use Tester\Assert;
+use Tester\TestCase;
+
+require_once __DIR__ . '/../bootstrap.php';
+
+/**
+ * @TestCase
+ */
+final class NewRelicExtensionTest extends TestCase
+{
+
+	public function testExtension(): void
+	{
+		$loader = new ContainerLoader(TEMP_DIR, true);
+		$class = $loader->load(function (Compiler $compiler): void {
+			$compiler->addConfig([
+				'newrelic' => [
+					'enabled' => true,
+					'appName' => 'YourApplicationName',
+					'license' => 'yourLicenseCode',
+					'actionKey' => 'action',
+					'logLevel' => [
+						'critical',
+						'exception',
+						'error',
+					],
+					'rum' => [
+						'enabled' => 'true',
+					],
+					'transactionTracer' => [
+						'enabled' => true,
+						'detail' => 1,
+						'recordSql' => 'obfuscated',
+						'slowSql' => true,
+						'threshold' => 'apdex_f',
+						'stackTraceThreshold' => 500,
+						'explainThreshold' => 500,
+					],
+					'errorCollector' => [
+						'enabled' => true,
+						'recordDatabaseErrors' => true,
+					],
+					'parameters' => [
+						'capture' => false,
+						'ignored' => [],
+					],
+					'custom' => [
+						'parameters' => [
+							'paramName' => 'paramValue',
+						],
+						'tracers' => [],
+					],
+				],
+			]);
+			$compiler->addExtension('application', new ApplicationExtension());
+			$compiler->addExtension('newrelic', new NewRelicExtension());
+		}, [getmypid(), 1]);
+
+		/** @var Container $container */
+		$container = new $class();
+
+		Assert::count(1, $container->findByType(OnRequestCallback::class));
+		Assert::count(1, $container->findByType(OnErrorCallback::class));
+	}
+
+}
+
+(new NewRelicExtensionTest())->run();
diff --git a/tests/Mocks/Application.php b/tests/Mocks/Application.php
new file mode 100644
index 0000000..1bc536d
--- /dev/null
+++ b/tests/Mocks/Application.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace ContributteTests\NewRelic\Mocks;
+
+final class Application
+{
+	public $onRequest = [];
+	public $onError = [];
+}
diff --git a/tests/Mocks/ApplicationExtension.php b/tests/Mocks/ApplicationExtension.php
new file mode 100644
index 0000000..9bc6fed
--- /dev/null
+++ b/tests/Mocks/ApplicationExtension.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ContributteTests\NewRelic\Mocks;
+
+use Nette;
+
+
+/**
+ * Application extension for Nette DI.
+ */
+final class ApplicationExtension extends Nette\DI\CompilerExtension
+{
+
+	public function loadConfiguration()
+	{
+		$config = $this->config;
+		$builder = $this->getContainerBuilder();
+
+		$builder->addDefinition('application')
+			->setFactory(Application::class);
+
+		$this->compiler->addExportedType(Application::class);
+	}
+
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 0000000..694bf66
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types = 1);
+
+use Ninjify\Nunjuck\Environment;
+
+if (@!include __DIR__ . '/../vendor/autoload.php') {
+	echo 'Install Nette Tester using `composer update --dev`';
+	exit(1);
+}
+
+// Configure environment
+Environment::setup(__DIR__);