At the point in time when the CodeCoverage object is created, the Filter object does not have whitelist information yet

Author: sebastianbergmann

src/CodeCoverage.php

@@ -153,7 +153,7 @@ public function __construct(Driver $driver = null, Filter $filter = null)
         $this->wizard = new Wizard;
 
         if ($this->driver->supportsWhitelistFiltering()) {
-            $this->driver->setWhitelistedFiles($this->filter->getWhitelistedFiles());
+            $this->driver->setFilter($this->filter);
         }
     }
 

src/Driver/Driver.php

@@ -10,6 +10,8 @@
 
 namespace SebastianBergmann\CodeCoverage\Driver;
 
+use SebastianBergmann\CodeCoverage\Filter;
+
 /**
  * Interface for code coverage drivers.
  */
@@ -52,7 +54,7 @@ public function stop(): array;
     public function supportsWhitelistFiltering(): bool;
 
     /**
-     * Sets the whitelist.
+     * Sets the filter.
      */
-    public function setWhitelistedFiles(array $whitelistedFiles): void;
+    public function setFilter(Filter $filter): void;
 }

src/Driver/PHPDBG.php

@@ -10,6 +10,7 @@
 
 namespace SebastianBergmann\CodeCoverage\Driver;
 
+use SebastianBergmann\CodeCoverage\Filter;
 use SebastianBergmann\CodeCoverage\RuntimeException;
 
 /**
@@ -85,7 +86,7 @@ public function supportsWhitelistFiltering(): bool
     /**
      * @throws RuntimeException
      */
-    public function setWhitelistedFiles(array $whitelistedFiles): void
+    public function setFilter(Filter $filter): void
     {
         throw new RuntimeException('PHPDBG does not support whitelist filtering');
     }

src/Driver/Xdebug.php

@@ -10,6 +10,7 @@
 
 namespace SebastianBergmann\CodeCoverage\Driver;
 
+use SebastianBergmann\CodeCoverage\Filter;
 use SebastianBergmann\CodeCoverage\RuntimeException;
 
 /**
@@ -29,6 +30,11 @@ final class Xdebug implements Driver
      */
     private $hasSupportForWhitelistFiltering;
 
+    /**
+     * @var Filter
+     */
+    private $filter;
+
     /**
      * @throws RuntimeException
      */
@@ -50,6 +56,10 @@ public function __construct()
      */
     public function start(bool $determineUnusedAndDead = true): void
     {
+        if ($this->supportsWhitelistFiltering()) {
+            \xdebug_set_filter(XDEBUG_FILTER_CODE_COVERAGE, XDEBUG_PATH_WHITELIST, $this->filter->getWhitelistedFiles());
+        }
+
         if ($determineUnusedAndDead) {
             \xdebug_start_code_coverage(XDEBUG_CC_UNUSED | XDEBUG_CC_DEAD_CODE);
         } else {
@@ -74,9 +84,9 @@ public function supportsWhitelistFiltering(): bool
         return $this->hasSupportForWhitelistFiltering;
     }
 
-    public function setWhitelistedFiles(array $whitelistedFiles): void
+    public function setFilter(Filter $filter): void
     {
-        \xdebug_set_filter(XDEBUG_FILTER_CODE_COVERAGE, XDEBUG_PATH_WHITELIST, $whitelistedFiles);
+        $this->filter = $filter;
     }
 
     private function cleanup(array $data): array