Enhancement: Declare test code in separate directories

[localheinz]

This pull request

• declares test code in subdirectories of test/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@d732079). Click here to learn what that means.

❗ Current head 497c2f7 differs from pull request most recent head 30c271d. Consider uploading reports for the commit 30c271d to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             main        #6   +/-   ##
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  Coverage        ?   100.00%           
  Complexity      ?         8           
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  Files           ?         3           
  Lines           ?        16           
  Branches        ?         0           
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  Hits            ?        16           
  Misses          ?         0           
  Partials        ?         0           

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[localheinz]

When you work on a package and declare test code in separate directories, adding exclusions for test code in .gitattributes is less work.

[localheinz]

When you declare test code in separate directories, managing exclusions for the composer autoloader in composer.json is unnecessary. Instead, you configure and document namespaces for test code via an autoloader configuration in the autoload-dev section.

[localheinz]

When you declare test code in separate directories, managing exclusions for infection/infection in infection.json is unnecessary.

[localheinz]

When you declare test code in separate directories, managing exclusions for collecting code coverage with phpunit/phpunit in phpunit.xml is unnecessary.