Align implementation with addUncoveredFilesFromFilter

src/CodeCoverage.php

@@ -20,7 +20,6 @@
 use function explode;
 use function file_exists;
 use function get_class;
-use function in_array;
 use function is_array;
 use function sort;
 use PHPUnit\Framework\TestCase;
@@ -503,7 +502,7 @@ private function addUncoveredFilesFromFilter(): void
     {
         $uncoveredFiles = array_diff(
             $this->filter->files(),
-            array_keys($this->data->lineCoverage())
+            $this->data->coveredFiles()
         );
 
         foreach ($uncoveredFiles as $uncoveredFile) {
@@ -524,13 +523,18 @@ private function addUncoveredFilesFromFilter(): void
      */
     private function processUncoveredFilesFromFilter(): void
     {
-        $coveredFiles = $this->data->coveredFiles();
+        $uncoveredFiles = array_diff(
+            $this->filter->files(),
+            $this->data->coveredFiles()
+        );
 
         $this->driver->start();
 
         foreach ($this->filter->files() as $file) {
-            if (!in_array($file, $coveredFiles, true) && $this->filter->isFile($file)) {
-                include_once $file;
+            foreach ($uncoveredFiles as $uncoveredFile) {
+                if (file_exists($uncoveredFile)) {
+                    include_once $file;
+                }
             }
         }