put runtime-generated data into data/

.php-cs-fixer.dist.php

@@ -14,4 +14,5 @@ return $_phpcs_config->setRules([
         'array_syntax' => ['syntax' => 'short'],
     ])
     ->setFinder($_phpcs_finder)
+	->setCacheFile("data/php-cs-fixer.cache")
 ;

core/testcase.php

@@ -52,7 +52,7 @@ if(class_exists("\\PHPUnit\\Framework\\TestCase")) {
             $_tracer->end();  # test
             $_tracer->end();  # $this->getName()
             $_tracer->clear();
-            $_tracer->flush("tests/trace.json");
+            $_tracer->flush("data/test-trace.json");
         }
 
         public static function tearDownAfterClass(): void

tests/phpunit.xml

@@ -1,5 +1,11 @@
 <?xml version="1.0"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="../tests/bootstrap.php" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd">
+<phpunit
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  bootstrap="../tests/bootstrap.php"
+  colors="true"
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+  cacheResultFile="../data/phpunit.cache"
+>
   <coverage/>
   <testsuites>
     <testsuite name="core">