fromJsonString example

$response->setData([[1, 2, 3]]);

        $this->assertEquals('[[1,2,3]]', $response->getContent());

        $response->setEncodingOptions(\JSON_FORCE_OBJECT);

        $this->assertEquals('{"0":{"0":1,"1":2,"2":3}}', $response->getContent());
    }

    public function testItAcceptsJsonAsString()
    {
        $response = JsonResponse::fromJsonString('{"foo":"bar"}');
        $this->assertSame('{"foo":"bar"}', $response->getContent());
    }

    public function testSetCallbackInvalidIdentifier()
    {
        $this->expectException(\InvalidArgumentException::class);
        $response = new JsonResponse('foo');
        $response->setCallback('+invalid');
    }

    public function testSetContent()
    {