diff --git a/tests/CarbonInterval/ConstructTest.php b/tests/CarbonInterval/ConstructTest.php
index 36ce6bb31f..abc66c874f 100644
--- a/tests/CarbonInterval/ConstructTest.php
+++ b/tests/CarbonInterval/ConstructTest.php
@@ -436,7 +436,7 @@ public function testFromSerialization()
         $today = new Carbon('today');
         $interval = $today->diffAsCarbonInterval($past);
         /** @var CarbonInterval $copy */
-        $copy =  unserialize(serialize($interval));
+        $copy = unserialize(serialize($interval));
 
         $this->assertInstanceOf(CarbonInterval::class, $copy);
 
@@ -454,7 +454,7 @@ public function testFromSerialization()
 
         $interval = $today->locale('ja')->diffAsCarbonInterval($past);
         /** @var CarbonInterval $copy */
-        $copy =  unserialize(serialize($interval));
+        $copy = unserialize(serialize($interval));
 
         $this->assertInstanceOf(CarbonInterval::class, $copy);
 
@@ -483,7 +483,7 @@ private function assertSameIntervals(CarbonInterval $expected, CarbonInterval $a
             $expected->microseconds !== $actual->microseconds
             && $microsecondApproximation > 0
             && $actual->microseconds >= $expected->microseconds - $microsecondApproximation
-            && $actual->microseconds <= $expected->microseconds - $microsecondApproximation
+            && $actual->microseconds <= $expected->microseconds + $microsecondApproximation
         ) {
             $actual->microseconds = $expected->microseconds;
         }