Fix flaky test (#51022)

Author: driesvints

tests/Database/QueryDurationThresholdTest.php

@@ -6,11 +6,17 @@
 use Illuminate\Database\Connection;
 use Illuminate\Events\Dispatcher;
 use Illuminate\Support\Arr;
+use Illuminate\Support\Carbon;
 use PDO;
 use PHPUnit\Framework\TestCase;
 
 class QueryDurationThresholdTest extends TestCase
 {
+    /**
+     * @var \Illuminate\Support\Carbon
+     */
+    protected $now;
+
     public function testItCanHandleReachingADurationThresholdInTheDb()
     {
         $connection = new Connection(new PDO('sqlite::memory:'));
@@ -46,10 +52,12 @@ public function testItIsOnlyCalledOnce()
 
     public function testItIsOnlyCalledOnceWhenGivenDateTime()
     {
+        Carbon::setTestNow($this->now = Carbon::create(2017, 6, 27, 13, 14, 15, 'UTC'));
+
         $connection = new Connection(new PDO('sqlite::memory:'));
         $connection->setEventDispatcher(new Dispatcher());
         $called = 0;
-        $connection->whenQueryingForLongerThan(now()->addMilliseconds(1), function () use (&$called) {
+        $connection->whenQueryingForLongerThan($this->now->addMilliseconds(1), function () use (&$called) {
             $called++;
         });
 
@@ -58,6 +66,8 @@ public function testItIsOnlyCalledOnceWhenGivenDateTime()
         $connection->logQuery('xxxx', [], 1);
 
         $this->assertSame(1, $called);
+
+        Carbon::setTestNow(null);
     }
 
     public function testItCanSpecifyMultipleHandlersWithTheSameIntervals()