The word inexistent is non-existent, what do you think about using no…

…n-existent instead?

tests/unit/Runner/DefaultTestResultCacheTest.php

@@ -27,7 +27,7 @@ protected function setUp(): void
         $this->subject = new DefaultTestResultCache();
     }
 
-    public function testGetTimeForInexistentTestNameReturnsZero(): void
+    public function testGetTimeForNonExistentTestNameReturnsZero(): void
     {
         $this->assertSame(0.0, $this->subject->getTime('doesNotExist'));
     }