When running php-openapi command in script, output should not be printed

[SOHELAHMED7]

I have a PHPUnit test case containing following line:

exec('echo Hiii...', $output, $code);

when I run the test case in CLI, "Hiii..." is not printed in CLI. This is expected.

In the same way if my script (PHPUnit test) has

exec('bin/php-openapi validate tests/data/issue/165/spec.yml', $output, $code);

the output of $ bin/php-openapi should not be printed in CLI but in reality it is printed

[SOHELAHMED7]

This issue was observed while fixing #165

[SOHELAHMED7]

This is a behaviour of exec(). See "User Contributed Notes" section on that page