added tags for timesheets (#604)

tests/Entity/TagTest.php

@@ -0,0 +1,51 @@
+<?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\Entity;
+
+use App\Entity\Tag;
+use App\Entity\Timesheet;
+
+/**
+ * @covers \App\Entity\Tag
+ */
+class TagTest extends AbstractEntityTest
+{
+    public function testDefaultValues()
+    {
+        $sut = new Tag();
+        $this->assertNull($sut->getId());
+        $this->assertNull($sut->getName());
+    }
+
+    public function testSetterAndGetter()
+    {
+        $sut = new Tag();
+
+        $this->assertInstanceOf(Tag::class, $sut->setName('foo'));
+        $this->assertEquals('foo', $sut->getName());
+        $this->assertEquals('foo', (string) $sut);
+    }
+
+    public function testWithTimesheet()
+    {
+        $sut = new Tag();
+        $timesheet = new Timesheet();
+
+        $this->assertEmpty($timesheet->getTags());
+
+        $sut->setName('bar');
+        $sut->addTimesheet($timesheet);
+
+        $this->assertSame($sut, $timesheet->getTags()[0]);
+
+        $sut->removeTimesheet($timesheet);
+        $this->assertEmpty($timesheet->getTags());
+    }
+}