[9.x] Adds "freezeTime" helper for tests. (#41460)

* [9.x] Adds "freezeTime" helper for tests.

* Removes start of second.
Returns callback result, if any.

* Adds freezeCurrentSecond for DB timestamps without subsecond precision.

* formatting

Co-authored-by: Taylor Otwell <taylor@laravel.com>

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

@@ -7,6 +7,28 @@
 
 trait InteractsWithTime
 {
+    /**
+     * Freeze time.
+     *
+     * @param  callable|null  $callback
+     * @return mixed
+     */
+    public function freezeTime($callback = null)
+    {
+        return $this->travelTo(Carbon::now(), $callback);
+    }
+
+    /**
+     * Freeze time at the beginning of the current second.
+     *
+     * @param  callable|null  $callback
+     * @return mixed
+     */
+    public function freezeSecond($callback = null)
+    {
+        return $this->travelTo(Carbon::now()->startOfSecond(), $callback);
+    }
+
     /**
      * Begin travelling to another time.
      *
@@ -30,7 +52,7 @@ public function travelTo($date, $callback = null)
         Carbon::setTestNow($date);
 
         if ($callback) {
-            return tap($callback(), function () {
+            return tap($callback(Carbon::now()), function () {
                 Carbon::setTestNow();
             });
         }