setSearchReturn example

    public function testGroupRegistrationAcceptMatches(?int $expectedResCode, ?array $customers, Request $request, ?string $errorMessage): void
    {
        $context = Context::createDefaultContext();

        if ($customers !== null) {
            $customerCollection = new CustomerCollection($customers);
            $this->setRestorerReturn();
            $this->setSearchReturn($context, $customerCollection);
            $this->setCustomerGroupSearchReturn($context);
        }

        if ($errorMessage !== null && $expectedResCode === null) {
            static::expectExceptionMessage($errorMessage);
        }

        $res = $this->controllerMock->accept($request, $context);
        static::assertSame($expectedResCode, $res->getStatusCode());
    }