Added provider tests.

tests/Provider/ManagerTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Rarst\Laps\Tests\Provider;
+
+use Pimple\Exception\FrozenServiceException;
+use Rarst\Laps\Plugin;
+use Rarst\Laps\Provider\Manager_Provider;
+use Rarst\Laps\Tests\LapsTestCase;
+
+class ManagerTest extends LapsTestCase {
+
+	/**
+	 * @covers \Rarst\Laps\Provider\Manager_Provider
+	 */
+	public function testProvider() {
+
+		$container = new Plugin();
+		$provider  = new Manager_Provider();
+
+		$provider->register( $container );
+
+		$this->assertArrayHasKey( 'managers', $container );
+
+		$container->extend( 'managers', function () {} );
+		$provider->boot( $container );
+		$this->expectException( FrozenServiceException::class );
+		$container->extend( 'managers', function () {} );
+	}
+}