support custom fields for timesheets, customers, projects and activities (#871)

tests/Entity/CustomerMetaTest.php

@@ -0,0 +1,42 @@
+<?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\Activity;
+use App\Entity\Customer;
+use App\Entity\CustomerMeta;
+use App\Entity\EntityWithMetaFields;
+use App\Entity\MetaTableTypeInterface;
+
+/**
+ * @covers \App\Entity\CustomerMeta
+ */
+class CustomerMetaTest extends AbstractMetaEntityTest
+{
+    protected function getEntity(): EntityWithMetaFields
+    {
+        return new Customer();
+    }
+
+    protected function getMetaEntity(): MetaTableTypeInterface
+    {
+        return new CustomerMeta();
+    }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Expected instanceof Customer, received "App\Entity\Activity"
+     */
+    public function testSetEntityThrowsException()
+    {
+        $sut = new CustomerMeta();
+        $sut->setEntity(new Activity());
+    }
+}