getInvoiceModel(); $sut = new InvoiceModelCustomerHydrator(); $result = $sut->hydrate($model); $this->assertModelStructure($result); $model->setCustomer(null); $result = $sut->hydrate($model); self::assertEmpty($result); } protected function assertModelStructure(array $model) { $keys = [ 'customer.id', 'customer.address', 'customer.name', 'customer.contact', 'customer.company', 'customer.vat', 'customer.country', 'customer.number', 'customer.homepage', 'customer.comment', 'customer.meta.foo-customer', ]; $givenKeys = array_keys($model); sort($keys); sort($givenKeys); $this->assertEquals($keys, $givenKeys); } }