Running the Infection cannot detect code coverage driver correctly

[peter279k]

Question	Answer
Infection version	0.26.11
Test Framework version	PHPUnit 9.5.21
PHP version	8.0.20 (php -v)
Platform	Ubuntu 18.04
Github Repo	https://github.com/peter279k/php-gender

When enabling the XDebug extension to run the ./vendor/bin/infection, it will get the following error message:

The code coverage generated by the initial test run is invalid. Please report the issue on the                                                          
  infection repository "https://github.com/infection/infection".               
                                                                               
                                                                 
  $ '/data/php-gender/vendor/bin/phpunit' '--configuration' '/tmp/infection/p  
  hpunitConfiguration.initial.infection.xml' '--coverage-xml=/tmp/infection/c  
  overage-xml' '--log-junit=/tmp/infection/junit.xml'                          
  PHPUnit 9.5.21 #StandWithUkraine                                             
                                                                               
  Random Seed:   1655794267                                                    
  Warning:       XDEBUG_MODE=coverage or xdebug.mode=coverage has to be set    
                                                                               
  .                                                                   1 / 1 (  
  100%)                                                                        
                                                                               
  Time: 00:00.006, Memory: 8.00 MB                                             
                                                                               
  OK (1 test, 3 assertions)                                                    
                                                                                                                                             
                                                                               
  Issue(s):                                                                    
  - The file "index.xml" could not be found: Could not find any "index.xml" file in "/tmp/infection"                                                      

• If adding the XDEBUG_MODE=coverage to declare the environment variable, it will not get above error message.
  • As this comment says, it's not necessary to do that. It seems to be a bug.