added export module (#538)

tests/Export/ServiceExportTest.php

@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Export;
+
+use App\Export\Renderer\HtmlRenderer;
+use App\Export\ServiceExport;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Export\ServiceExport
+ */
+class ServiceExportTest extends TestCase
+{
+    public function testEmptyObject()
+    {
+        $sut = new ServiceExport();
+        $this->assertEmpty($sut->getRenderer());
+    }
+
+    public function testUnknownRendererReturnsNull()
+    {
+        $sut = new ServiceExport();
+        $this->assertNull($sut->getRendererById('default'));
+    }
+
+    public function testAdd()
+    {
+        $sut = new ServiceExport();
+
+        $sut->addRenderer(new HtmlRenderer(
+            $this->getMockBuilder(\Twig_Environment::class)->disableOriginalConstructor()->getMock()
+        ));
+
+        $this->assertEquals(1, count($sut->getRenderer()));
+    }
+}