test: add tests for Time::isBefore() and isAfter()

Author: kenjis

tests/system/I18n/TimeTest.php

@@ -936,6 +936,15 @@ public function testBefore(): void
         $this->assertFalse($time2->isBefore($time1));
     }
 
+    public function testBeforeWithMicroseconds(): void
+    {
+        $time1 = new Time('2024-01-01 12:00:00.000000');
+        $time2 = new Time('2024-01-01 12:00:00.654321');
+
+        $this->assertTrue($time1->isBefore($time2));
+        $this->assertFalse($time2->isBefore($time1));
+    }
+
     public function testAfter(): void
     {
         $time1 = Time::parse('January 10, 2017 21:50:00', 'America/Chicago');
@@ -945,6 +954,15 @@ public function testAfter(): void
         $this->assertTrue($time2->isAfter($time1));
     }
 
+    public function testAfterWithMicroseconds(): void
+    {
+        $time1 = new Time('2024-01-01 12:00:00.654321');
+        $time2 = new Time('2024-01-01 12:00:00.000000');
+
+        $this->assertTrue($time1->isAfter($time2));
+        $this->assertFalse($time2->isAfter($time1));
+    }
+
     public function testHumanizeYearsSingle(): void
     {
         Time::setTestNow('March 10, 2017', 'America/Chicago');