Add $seconds to keepalive methods

Author: valtzu

Application.php

@@ -139,6 +139,14 @@ public function setAlarmInterval(?int $seconds): void
         $this->scheduleAlarm();
     }
 
+    /**
+     * Gets the interval in seconds on which a SIGALRM signal is dispatched.
+     */
+    public function getAlarmInterval(): ?int
+    {
+        return $this->alarmInterval;
+    }
+
     private function scheduleAlarm(): void
     {
         if (null !== $this->alarmInterval) {

Tests/ApplicationTest.php

@@ -2305,6 +2305,7 @@ public function testAlarmDispatchWithoutEventDispatcher()
         $application = $this->createSignalableApplication($command, null);
 
         $this->assertSame(1, $application->run(new ArrayInput(['alarm'])));
+        $this->assertSame(1, $application->getAlarmInterval());
         $this->assertTrue($command->signaled);
     }