Removes isInParallel

src/Concerns/Testable.php

@@ -304,12 +304,4 @@ trait Testable
     {
         return ltrim(self::class, 'P\\');
     }
-
-    /**
-     * Determine whether this test case is being executed in a parallel environment.
-     */
-    public function isInParallel(): bool
-    {
-        return TestSuite::getInstance()->isInParallel;
-    }
 }

src/TestSuite.php

@@ -73,13 +73,6 @@ final class TestSuite
      */
     public $testPath;
 
-    /**
-     * Whether this test is running as part of a parallel suite.
-     *
-     * @var bool
-     */
-    public $isInParallel = false;
-
     /**
      * Holds an instance of the test suite.
      *