Unit test cases in pimcore, getting error while executing test cases

Hi Team,

pimcore v 6.6

I’m trying to unit test by codeception, I have installed codception and tests/ folder created under my project directory. But when im calling the service function getting below error

Error attached:

**[PHPUnit\Framework\Exception] Use of undefined constant PIMCORE_PROJECT_ROOT - assumed 'PIMCORE_PROJECT_ROOT' (this will throw an Error in a future version of PHP)

src/GenericBundle/Service/PdfImportService.php:31**

File name for test is **PdfImportServiceTest.php**

public function testGetFilesArray()
{
$pdfService = new PdfImportService();
$this->assertFalse($pdfService->getFilesArray());
}

I have added bootstrap.php file inside tests/ path. Code is here:

<?php

// tests/bootstrap.php

include "./vendor/autoload.php";

\Pimcore\Bootstrap::setProjectRoot();
\Pimcore\Bootstrap::bootstrap();

Added another file named codeception.dist.yml:

namespace: Tests
support_namespace: Support
actor_suffix: Tester
paths:
    tests: .
    output: ./_output
    data: ./Support/Data
    support: ./Support
    envs: ./_envs
settings:
    bootstrap: _bootstrap.php
    colors: true
params:
    - env
extensions:
    enabled:
        - Codeception\Extension\RunFailed

When I’m executing this test case, it is calling constructor of actual service file and there we have defined constant path for the file, but this test case is not working. Actual function from the backend is working

https://imgur.com/a/S2i833s

In some services im getting get container null error… Please check the link for error.

I followed pimcore unit testing document + symfony documnet + codception document. But it didn’t work for me. I’m stuck with this from 3 days.

Please let me know how to resolve it.

Thanks in advance