added database driven system configurations with admin screen (#647)

tests/Entity/ConfigurationTest.php

@@ -0,0 +1,35 @@
+<?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\Configuration;
+
+/**
+ * @covers \App\Entity\Configuration
+ */
+class ConfigurationTest extends AbstractEntityTest
+{
+    public function testDefaultValues()
+    {
+        $sut = new Configuration();
+        $this->assertNull($sut->getId());
+        $this->assertNull($sut->getName());
+        $this->assertNull($sut->getValue());
+    }
+
+    public function testSetterAndGetter()
+    {
+        $sut = new Configuration();
+        $this->assertInstanceOf(Configuration::class, $sut->setName('foo-bar'));
+        $this->assertEquals('foo-bar', $sut->getName());
+        $this->assertInstanceOf(Configuration::class, $sut->setValue('hello world'));
+        $this->assertEquals('hello world', $sut->getValue());
+    }
+}