[8.x] Adds an ability for the Wormhole class to take us back to the present.

src/Illuminate/Foundation/Testing/Concerns/InteractsWithTime.php

@@ -44,8 +44,6 @@ public function travelTo(DateTimeInterface $date, $callback = null)
      */
     public function travelBack()
     {
-        Carbon::setTestNow();
-
-        return Carbon::now();
+        return Wormhole::back();
     }
 }

src/Illuminate/Foundation/Testing/Wormhole.php

@@ -115,6 +115,18 @@ public function years($callback = null)
         return $this->handleCallback($callback);
     }
 
+    /**
+     * Travel back to the current time.
+     *
+     * @return \DateTimeInterface
+     */
+    public static function back()
+    {
+        Carbon::setTestNow();
+
+        return Carbon::now();
+    }
+
     /**
      * Handle the given optional execution callback.
      *

tests/Foundation/Testing/WormholeTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Illuminate\Tests\Foundation\Testing;
+
+use Illuminate\Foundation\Testing\Wormhole;
+use PHPUnit\Framework\TestCase;
+
+class WormholeTest extends TestCase
+{
+    public function testCanTravelBackToPresent()
+    {
+        // Preserve the timelines we want to compare the reality with..
+        $present = now();
+        $future = now()->addDays(10);
+
+        // Travel in time..
+        (new Wormhole(10))->days();
+
+        // Assert we are now in the future..
+        $this->assertEquals($future->format('Y-m-d'), now()->format('Y-m-d'));
+
+        // Assert we can go back to the present..
+        $this->assertEquals($present->format('Y-m-d'), Wormhole::back()->format('Y-m-d'));
+    }
+}