diff --git a/Classes/Domain/Model/Frontend/OpeningHour.php b/Classes/Domain/Model/Frontend/OpeningHour.php
index f33839d..ced292f 100644
--- a/Classes/Domain/Model/Frontend/OpeningHour.php
+++ b/Classes/Domain/Model/Frontend/OpeningHour.php
@@ -83,7 +83,7 @@ class OpeningHour
         return new self(
             $rawData['opens'] ?? '',
             $rawData['closes'] ?? '',
-            $rawData['daysOfWeek'] ?? '',
+            $rawData['daysOfWeek'] ?? [],
             $from,
             $through
         );
diff --git a/Tests/Unit/Domain/Model/Frontend/OffersTest.php b/Tests/Unit/Domain/Model/Frontend/OffersTest.php
new file mode 100644
index 0000000..60c9939
--- /dev/null
+++ b/Tests/Unit/Domain/Model/Frontend/OffersTest.php
@@ -0,0 +1,174 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WerkraumMedia\ThueCat\Tests\Unit\Domain\Model\Frontend;
+
+/*
+ * Copyright (C) 2021 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use PHPUnit\Framework\TestCase;
+use WerkraumMedia\ThueCat\Domain\Model\Frontend\Offers;
+
+/**
+ * @covers WerkraumMedia\ThueCat\Domain\Model\Frontend\Offers
+ * @testdox Frontend model for offers
+ */
+class OffersTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function canBeCreated(): void
+    {
+        $subject = new Offers('{}');
+
+        self::assertInstanceOf(Offers::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function isCountable(): void
+    {
+        $subject = new Offers('{}');
+
+        self::assertInstanceOf(\Countable::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function isIterator(): void
+    {
+        $subject = new Offers('{}');
+
+        self::assertInstanceOf(\Iterator::class, $subject);
+    }
+
+    /**
+     * @test
+     * @dataProvider forCount
+     * @testdox returns $expected for count
+     */
+    public function returnsExpectedCount(string $serialized, int $expected): void
+    {
+        $subject = new Offers($serialized);
+
+        self::assertCount($expected, $subject);
+    }
+
+    public function forCount(): array
+    {
+        return [
+            'zero' => [
+                'serialized' => '{}',
+                'expected' => 0,
+            ],
+            'one' => [
+                'serialized' => json_encode([
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                ]),
+                'expected' => 1,
+            ],
+            'five' => [
+                'serialized' => json_encode([
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                    [
+                        'title' => '',
+                        'description' => '',
+                        'prices' => [
+                            [
+                                'title' => '',
+                                'description' => '',
+                                'price' => 5.0,
+                                'currency' => '',
+                                'rule' => '',
+                            ],
+                        ],
+                    ],
+                ]),
+                'expected' => 5,
+            ],
+        ];
+    }
+}
diff --git a/Tests/Unit/Domain/Model/Frontend/OpeningHoursTest.php b/Tests/Unit/Domain/Model/Frontend/OpeningHoursTest.php
new file mode 100644
index 0000000..d1e0dcf
--- /dev/null
+++ b/Tests/Unit/Domain/Model/Frontend/OpeningHoursTest.php
@@ -0,0 +1,108 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WerkraumMedia\ThueCat\Tests\Unit\Domain\Model\Frontend;
+
+/*
+ * Copyright (C) 2021 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use PHPUnit\Framework\TestCase;
+use WerkraumMedia\ThueCat\Domain\Model\Frontend\OpeningHours;
+
+/**
+ * @covers WerkraumMedia\ThueCat\Domain\Model\Frontend\OpeningHours
+ * @testdox Frontend model for offers
+ */
+class OpeningHoursTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function canBeCreated(): void
+    {
+        $subject = new OpeningHours('{}');
+
+        self::assertInstanceOf(OpeningHours::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function isCountable(): void
+    {
+        $subject = new OpeningHours('{}');
+
+        self::assertInstanceOf(\Countable::class, $subject);
+    }
+
+    /**
+     * @test
+     */
+    public function isIterator(): void
+    {
+        $subject = new OpeningHours('{}');
+
+        self::assertInstanceOf(\Iterator::class, $subject);
+    }
+
+    /**
+     * @test
+     * @dataProvider forCount
+     * @testdox returns $expected for count
+     */
+    public function returnsExpectedCount(string $serialized, int $expected): void
+    {
+        $subject = new OpeningHours($serialized);
+
+        self::assertCount($expected, $subject);
+    }
+
+    public function forCount(): array
+    {
+        return [
+            'zero' => [
+                'serialized' => '{}',
+                'expected' => 0,
+            ],
+            'one' => [
+                'serialized' => json_encode([
+                    [
+                    ],
+                ]),
+                'expected' => 1,
+            ],
+            'five' => [
+                'serialized' => json_encode([
+                    [
+                    ],
+                    [
+                    ],
+                    [
+                    ],
+                    [
+                    ],
+                    [
+                    ],
+                ]),
+                'expected' => 5,
+            ],
+        ];
+    }
+}