Be paranoid

Author: sebastianbergmann

src/Framework/TestSuite.php

@@ -80,6 +80,7 @@ class TestSuite implements IteratorAggregate, Reorderable, SelfDescribing, Test
      */
     private ?array $providedTests    = null;
     private ?Factory $iteratorFilter = null;
+    private bool $wasRun             = false;
 
     /**
      * @psalm-param non-empty-string $name
@@ -326,6 +327,14 @@ public function groupDetails(): array
      */
     public function run(): void
     {
+        if ($this->wasRun) {
+            // @codeCoverageIgnoreStart
+            throw new Exception('The tests aggregated by this TestSuite were already run');
+            // @codeCoverageIgnoreEnd
+        }
+
+        $this->wasRun = true;
+
         if (count($this) === 0) {
             return;
         }