Remove dead code

Author: sebastianbergmann

src/Framework/TestResult.php

@@ -99,11 +99,6 @@ final class TestResult implements Countable
      */
     private $time = 0;
 
-    /**
-     * @var TestSuite
-     */
-    private $topTestSuite;
-
     /**
      * Code Coverage information.
      *
@@ -401,10 +396,6 @@ public function startTestSuite(TestSuite $suite): void
     {
         $this->currentTestSuiteFailed = false;
 
-        if ($this->topTestSuite === null) {
-            $this->topTestSuite = $suite;
-        }
-
         foreach ($this->listeners as $listener) {
             $listener->startTestSuite($suite);
         }
@@ -618,14 +609,6 @@ public function passedClasses(): array
         return $this->passedTestClasses;
     }
 
-    /**
-     * Returns the (top) test suite.
-     */
-    public function topTestSuite(): TestSuite
-    {
-        return $this->topTestSuite;
-    }
-
     /**
      * Returns whether code coverage information should be collected.
      */