improved invoices with new renderer (#306)

* added docx renderer and demo template
* added csv renderer and demo template
* added xlsx renderer and demo template
* added ods renderer and demo template
* added user calculator
* added invoice documentation

tests/Repository/InvoiceDocumentRepositoryTest.php

@@ -0,0 +1,60 @@
+<?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\Repository;
+
+use App\Entity\InvoiceDocument;
+use App\Repository\InvoiceDocumentRepository;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Repository\InvoiceDocumentRepository
+ */
+class InvoiceDocumentRepositoryTest extends TestCase
+{
+    protected static $defaultDirectories = [
+        'templates/invoice/renderer'
+    ];
+
+    protected static $defaultDocuments = [
+        'company.docx',
+        'default.html.twig',
+        'export.csv',
+        'freelancer.html.twig',
+        'open-spreadsheet.ods',
+        'spreadsheet.xlsx',
+        'timesheet.html.twig',
+    ];
+
+    public function testWithEmptyDirectory()
+    {
+        $sut = new InvoiceDocumentRepository([]);
+        $this->assertEmpty($sut->findAll());
+        $this->assertInternalType('array', $sut->findAll());
+        $this->assertNull($sut->findByName('default'));
+    }
+
+    public function testDefaultTemplatesExists()
+    {
+        $sut = new InvoiceDocumentRepository(self::$defaultDirectories);
+        $all = $sut->findAll();
+        $this->assertEquals(count(self::$defaultDocuments), count($all));
+
+        foreach ($all as $document) {
+            $this->assertTrue(in_array($document->getName(), self::$defaultDocuments));
+        }
+
+        foreach (self::$defaultDocuments as $filename) {
+            $filename = substr($filename, 0, strpos($filename, '.'));
+            $actual = $sut->findByName($filename);
+            $this->assertNotNull($actual);
+            $this->assertInstanceOf(InvoiceDocument::class, $actual);
+        }
+    }
+}