Fix config level and fix DRUPAL_TEST_IN_CHILD_SITE constant

* Fix config level; prove some failures still exist

* Actually fix DRUPAL_TEST_IN_CHILD_SITE

* Conditionally define the constant

Author: mglaman

src/DependencyInjection/DrupalExtension.php

@@ -177,5 +177,13 @@ public function afterCompile(Nette\PhpGenerator\ClassType $class)
         // @todo find a non-hack way to pass the Drupal roots to the bootstrap file.
         $class->getMethod('initialize')->addBody('$GLOBALS["drupalRoot"] = ?;', [$this->drupalRoot]);
         $class->getMethod('initialize')->addBody('$GLOBALS["drupalVendorDir"] = ?;', [$this->drupalVendorDir]);
+
+        // DRUPAL_TEST_IN_CHILD_SITE is only defined in the \Drupal\Core\DrupalKernel::bootEnvironment method when
+        // Drupal is bootstrapped. Since we don't actually invoke the bootstrapping of Drupal, define the constant here
+        // as `false`. And we have to conditionally define it due to our own PHPUnit tests
+        $class->getMethod('initialize')->addBody('
+if (!defined("DRUPAL_TEST_IN_CHILD_SITE")) {
+  define("DRUPAL_TEST_IN_CHILD_SITE", ?);
+}', [false]);
     }
 }

tests/fixtures/config/phpunit-drupal-phpstan.neon

@@ -1,7 +1,12 @@
 parameters:
+	reportUnmatchedIgnoredErrors: false
 	level: 7
+	# Ignore functions for the PHPUnit bootstrap process.
+	ignoreErrors:
+		- '#Function drupal_phpunit_[a-zA-Z0-9\\_]+ not found#'
 drupal:
 	drupal_root: %currentWorkingDirectory%
 includes:
 	- ../../../extension.neon
+	- ../../../vendor/phpstan/phpstan/conf/config.level2.neon
 	- ../../../vendor/phpstan/phpstan-deprecation-rules/rules.neon