diff --git a/tests/test-rsscloud.php b/tests/test-rsscloud.php
index 91af374..724634c 100644
--- a/tests/test-rsscloud.php
+++ b/tests/test-rsscloud.php
@@ -32,4 +32,58 @@ public function test_query_vars_adds_rsscloud() {
 		$this->assertContains( 'existing_var', $result );
 		$this->assertContains( 'rsscloud', $result );
 	}
+
+	public function test_add_rss_cloud_element_returns_early_when_not_feed() {
+		ob_start();
+		rsscloud_add_rss_cloud_element();
+		$output = ob_get_clean();
+
+		$this->assertEmpty( $output );
+	}
+
+	public function test_add_rss_cloud_element_outputs_cloud_tag_on_feed() {
+		$this->go_to( get_feed_link( 'rss2' ) );
+
+		ob_start();
+		rsscloud_add_rss_cloud_element();
+		$output = ob_get_clean();
+
+		$this->assertStringContainsString( '<cloud ', $output );
+		$this->assertStringContainsString( "protocol='http-post'", $output );
+		$this->assertStringContainsString( 'rsscloud=notify', $output );
+	}
+
+	public function test_add_rss_cloud_element_uses_correct_domain() {
+		$this->go_to( get_feed_link( 'rss2' ) );
+
+		ob_start();
+		rsscloud_add_rss_cloud_element();
+		$output = ob_get_clean();
+
+		$home = wp_parse_url( get_option( 'home' ) );
+		$this->assertStringContainsString( "domain='" . $home['host'] . "'", $output );
+	}
+
+	public function test_add_rss_cloud_element_uses_port_from_home_url() {
+		$this->go_to( get_feed_link( 'rss2' ) );
+
+		ob_start();
+		rsscloud_add_rss_cloud_element();
+		$output = ob_get_clean();
+
+		$home = wp_parse_url( get_option( 'home' ) );
+		$port = ! empty( $home['port'] ) ? (int) $home['port'] : 80;
+		$this->assertStringContainsString( "port='" . $port . "'", $output );
+	}
+
+	public function test_parse_request_does_nothing_without_rsscloud_var() {
+		$wp             = new stdClass();
+		$wp->query_vars = array( 'p' => '1' );
+
+		// Should return without calling exit or any notification processing.
+		rsscloud_parse_request( $wp );
+
+		// If we reach this point, the function returned normally.
+		$this->assertTrue( true );
+	}
 }
diff --git a/tests/test-schedule-post-notifications.php b/tests/test-schedule-post-notifications.php
new file mode 100644
index 0000000..cc1262b
--- /dev/null
+++ b/tests/test-schedule-post-notifications.php
@@ -0,0 +1,76 @@
+<?php
+/**
+ * Tests for schedule-post-notifications functions.
+ *
+ * @package Rsscloud
+ */
+
+class SchedulePostNotificationsTest extends WP_UnitTestCase {
+
+	public function set_up() {
+		parent::set_up();
+		// Clear any scheduled events from prior tests.
+		wp_clear_scheduled_hook( 'rsscloud_send_post_notifications_action' );
+	}
+
+	public function test_schedules_cron_event_by_default() {
+		rsscloud_schedule_post_notifications();
+
+		$next = wp_next_scheduled( 'rsscloud_send_post_notifications_action' );
+		$this->assertNotFalse( $next, 'Expected a cron event to be scheduled.' );
+	}
+
+	public function test_instant_mode_calls_send_directly() {
+		define( 'RSSCLOUD_NOTIFICATIONS_INSTANT', true );
+
+		// Set up a subscriber keyed to the actual feed URL the function will resolve.
+		$feed_url   = get_bloginfo( 'rss2_url' );
+		$notify_url = 'http://subscriber.example.com/rpc';
+		rsscloud_update_hub_notifications(
+			array(
+				$feed_url => array(
+					$notify_url => array(
+						'protocol'      => 'http-post',
+						'status'        => 'active',
+						'failure_count' => 0,
+					),
+				),
+			)
+		);
+
+		$sent = false;
+		add_filter(
+			'pre_http_request',
+			function () use ( &$sent ) {
+				$sent = true;
+				return array(
+					'response' => array(
+						'code'    => 200,
+						'message' => 'OK',
+					),
+					'body'     => '',
+				);
+			},
+			10,
+			3
+		);
+
+		rsscloud_schedule_post_notifications();
+
+		$this->assertTrue( $sent, 'Expected notifications to be sent immediately in instant mode.' );
+	}
+
+	public function test_cron_action_hook_is_registered() {
+		$this->assertSame(
+			10,
+			has_action( 'rsscloud_send_post_notifications_action', 'rsscloud_send_post_notifications' )
+		);
+	}
+
+	public function test_publish_post_hook_is_registered() {
+		$this->assertSame(
+			10,
+			has_action( 'publish_post', 'rsscloud_schedule_post_notifications' )
+		);
+	}
+}