From 734c947dc4e58637a9a062b1f0ec32ed4d25e3cc Mon Sep 17 00:00:00 2001
From: Tim Carr <tim@n7studios.co.uk>
Date: Wed, 4 Feb 2026 10:19:25 +0800
Subject: [PATCH 1/4] Check if block/shortcode defined when fetching and
 replacing forms

---
 .../class-convertkit-admin-importer.php       | 63 ++++++++++++++-----
 1 file changed, 46 insertions(+), 17 deletions(-)

diff --git a/admin/importers/class-convertkit-admin-importer.php b/admin/importers/class-convertkit-admin-importer.php
index 94877e72e..11f4c86e0 100644
--- a/admin/importers/class-convertkit-admin-importer.php
+++ b/admin/importers/class-convertkit-admin-importer.php
@@ -119,8 +119,12 @@ public function import( $mappings ) {
 
 		// Iterate through the mappings, replacing the third party form shortcodes and blocks with the Kit form shortcodes and blocks.
 		foreach ( $mappings as $third_party_form_id => $kit_form_id ) {
-			$this->replace_blocks_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
-			$this->replace_shortcodes_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
+			if ( $this->block_name ) {
+				$this->replace_blocks_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
+			}
+			if ( $this->shortcode_name ) {
+				$this->replace_shortcodes_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
+			}
 		}
 
 	}
@@ -136,24 +140,49 @@ public function get_forms_in_posts() {
 
 		global $wpdb;
 
-		// Search post_content for the third party form block or shortcode and return array of post IDs.
-		$results = $wpdb->get_col(
-			$wpdb->prepare(
-				"
-            SELECT ID
-            FROM {$wpdb->posts}
-            WHERE post_status = %s
-            AND (
-				post_content LIKE %s
-				OR post_content LIKE %s
-			)
-            ",
-				'publish',
-				'%[' . $this->shortcode_name . '%',
-				'%<!-- wp:' . $this->block_name . '%'
+		// Build WHERE clauses and values.
+		$post_content_clauses = array();
+		$post_content_values  = array();
+
+		if ( $this->shortcode_name ) {
+			$post_content_clauses[] = 'post_content LIKE %s';
+			$post_content_values[]  = '%[' . $this->shortcode_name . '%';
+		}
+		if ( $this->block_name ) {
+			$post_content_clauses[] = 'post_content LIKE %s';
+			$post_content_values[]  = '%<!-- wp:' . $this->block_name . '%';
+		}
+
+		// Bail early if nothing to search for.
+		if ( empty( $post_content_clauses ) ) {
+			return array();
+		}
+
+		// Prepare SQL using wpdb->prepare.
+		// call_user_func_array() is used so variable length arrays can be passed to prepare().
+		$query = call_user_func_array(
+			array( $wpdb, 'prepare' ),
+			array_merge(
+				array(
+					"
+					SELECT ID
+					FROM {$wpdb->posts}
+					WHERE post_status = %s
+					AND (
+						" . implode( ' OR ', $post_content_clauses ) . '
+					)
+				',
+				),
+				array_merge(
+					array( 'publish' ),
+					$post_content_values
+				)
 			)
 		);
 
+		// Run query.
+		$results = $wpdb->get_col( $query ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
+
 		return $results ? $results : array();
 
 	}

From 12866bb860fa7cb9394dc2e4c39b18daa3e362a2 Mon Sep 17 00:00:00 2001
From: Tim Carr <tim@n7studios.co.uk>
Date: Wed, 4 Feb 2026 11:04:59 +0800
Subject: [PATCH 2/4] Importers: Support non-integer form IDs

Campaign Monitor uses e.g. `cm_123456`
---
 .../class-convertkit-admin-importer.php       | 36 +++++++++----------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/admin/importers/class-convertkit-admin-importer.php b/admin/importers/class-convertkit-admin-importer.php
index 11f4c86e0..044579384 100644
--- a/admin/importers/class-convertkit-admin-importer.php
+++ b/admin/importers/class-convertkit-admin-importer.php
@@ -120,10 +120,10 @@ public function import( $mappings ) {
 		// Iterate through the mappings, replacing the third party form shortcodes and blocks with the Kit form shortcodes and blocks.
 		foreach ( $mappings as $third_party_form_id => $kit_form_id ) {
 			if ( $this->block_name ) {
-				$this->replace_blocks_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
+				$this->replace_blocks_in_posts( $third_party_form_id, (int) $kit_form_id );
 			}
 			if ( $this->shortcode_name ) {
-				$this->replace_shortcodes_in_posts( (int) $third_party_form_id, (int) $kit_form_id );
+				$this->replace_shortcodes_in_posts( $third_party_form_id, (int) $kit_form_id );
 			}
 		}
 
@@ -218,8 +218,8 @@ public function has_forms_in_posts() {
 	 *
 	 * @since   3.1.0
 	 *
-	 * @param   int $third_party_form_id    Third Party Form ID.
-	 * @param   int $form_id                Kit Form ID.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 	 */
 	public function replace_shortcodes_in_posts( $third_party_form_id, $form_id ) {
 
@@ -258,9 +258,9 @@ public function replace_shortcodes_in_posts( $third_party_form_id, $form_id ) {
 	 *
 	 * @since   3.1.0
 	 *
-	 * @param   string $content             Content containing third party Form Shortcodes.
-	 * @param   int    $third_party_form_id    Third Party Form ID.
-	 * @param   int    $form_id                Kit Form ID.
+	 * @param   string     $content                Content containing third party Form Shortcodes.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 
 	 * @return  string
 	 */
@@ -382,8 +382,8 @@ public function get_form_ids_from_content( $content ) {
 	 *
 	 * @since   3.1.6
 	 *
-	 * @param   int $third_party_form_id    Third Party Form ID.
-	 * @param   int $form_id                Kit Form ID.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 	 */
 	public function replace_blocks_in_posts( $third_party_form_id, $form_id ) {
 
@@ -407,9 +407,9 @@ public function replace_blocks_in_posts( $third_party_form_id, $form_id ) {
 	 *
 	 * @since   3.1.6
 	 *
-	 * @param   int $post_id                Post ID.
-	 * @param   int $third_party_form_id    Third Party Form ID.
-	 * @param   int $form_id                Kit Form ID.
+	 * @param   int        $post_id                Post ID.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 	 */
 	public function replace_blocks_in_post( $post_id, $third_party_form_id, $form_id ) {
 
@@ -448,9 +448,9 @@ public function replace_blocks_in_post( $post_id, $third_party_form_id, $form_id
 	 *
 	 * @since   3.1.6
 	 *
-	 * @param   array $blocks                 Blocks.
-	 * @param   int   $third_party_form_id    Third Party Form ID.
-	 * @param   int   $form_id                Kit Form ID.
+	 * @param   array      $blocks                 Blocks.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 	 *
 	 * @return  string
 	 */
@@ -470,9 +470,9 @@ public function replace_blocks_in_content( $blocks, $third_party_form_id, $form_
 	 *
 	 * @since   3.1.6
 	 *
-	 * @param   array $blocks                 Blocks.
-	 * @param   int   $third_party_form_id    Third Party Form ID.
-	 * @param   int   $form_id                Kit Form ID.
+	 * @param   array      $blocks                 Blocks.
+	 * @param   string|int $third_party_form_id    Third Party Form ID.
+	 * @param   int        $form_id                Kit Form ID.
 	 * @return  array
 	 */
 	private function recursively_convert_blocks( $blocks, $third_party_form_id, $form_id ) {

From 945ef8b588dfbf0da1591aae2379f6a17d48f01b Mon Sep 17 00:00:00 2001
From: Tim Carr <tim@n7studios.co.uk>
Date: Wed, 4 Feb 2026 11:05:05 +0800
Subject: [PATCH 3/4] Added Campaign Monitor importer

---
 ...vertkit-admin-importer-campaignmonitor.php | 98 +++++++++++++++++++
 includes/class-wp-convertkit.php              |  1 +
 wp-convertkit.php                             |  1 +
 3 files changed, 100 insertions(+)
 create mode 100644 admin/importers/class-convertkit-admin-importer-campaignmonitor.php

diff --git a/admin/importers/class-convertkit-admin-importer-campaignmonitor.php b/admin/importers/class-convertkit-admin-importer-campaignmonitor.php
new file mode 100644
index 000000000..7cbde17b3
--- /dev/null
+++ b/admin/importers/class-convertkit-admin-importer-campaignmonitor.php
@@ -0,0 +1,98 @@
+<?php
+/**
+ * ConvertKit Admin Importer CampaignMonitor class.
+ *
+ * @package ConvertKit
+ * @author ConvertKit
+ */
+
+/**
+ * Import and migrate data from CampaignMonitor to Kit.
+ *
+ * @package ConvertKit
+ * @author ConvertKit
+ */
+class ConvertKit_Admin_Importer_CampaignMonitor extends ConvertKit_Admin_Importer {
+
+	/**
+	 * Holds the programmatic name of the importer (lowercase, no spaces).
+	 *
+	 * @since   3.1.7
+	 *
+	 * @var     string
+	 */
+	public $name = 'campaignmonitor';
+
+	/**
+	 * Holds the title of the importer (for display in the importer list).
+	 *
+	 * @since   3.1.7
+	 *
+	 * @var     string
+	 */
+	public $title = 'CampaignMonitor';
+
+	/**
+	 * Holds the shortcode name for ActiveCampaign forms.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @var     string
+	 */
+	public $shortcode_name = 'cm_form';
+
+	/**
+	 * Holds the ID attribute name for CampaignMonitor forms.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @var     string
+	 */
+	public $shortcode_id_attribute = 'form_id';
+
+	/**
+	 * Constructor
+	 *
+	 * @since   3.1.7
+	 */
+	public function __construct() {
+
+		// Register this as an importer, if CampaignMonitor forms exist.
+		add_filter( 'convertkit_get_form_importers', array( $this, 'register' ) );
+
+	}
+
+	/**
+	 * Returns an array of CampaignMonitor form IDs and titles.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @return  array
+	 */
+	public function get_forms() {
+
+		// Forms are cached in the Plugin Settings.
+		$settings = get_option( 'forms_for_campaign_monitor_forms' );
+
+		// Bail if the CampaignMonitor Plugin Settings are not set.
+		if ( ! $settings ) {
+			return array();
+		}
+
+		// Build array of forms.
+		$forms = array();
+		foreach ( $settings as $form_id => $form ) {
+			// $form is a Campaign Monitor forms\core\Form object. It'll be a __PHP_Incomplete_Class if the Campaign Monitor plugin is not active.
+			// To consistently access the protected form name property, we have to cast to an array.
+			$form = (array) $form;
+
+			// Access the protected form name property.
+			// When casting __PHP_Incomplete_Class to an array, protected properties are prefixed with \0*\0.
+			$forms[ $form_id ] = $form["\0*\0name"];
+		}
+
+		return $forms;
+
+	}
+
+}
diff --git a/includes/class-wp-convertkit.php b/includes/class-wp-convertkit.php
index 067fc1c26..ecafc5792 100644
--- a/includes/class-wp-convertkit.php
+++ b/includes/class-wp-convertkit.php
@@ -85,6 +85,7 @@ private function initialize_admin() {
 		$this->classes['admin_landing_page']                  = new ConvertKit_Admin_Landing_Page();
 		$this->classes['admin_importer_activecampaign']       = new ConvertKit_Admin_Importer_ActiveCampaign();
 		$this->classes['admin_importer_aweber']               = new ConvertKit_Admin_Importer_AWeber();
+		$this->classes['admin_importer_campaignmonitor']      = new ConvertKit_Admin_Importer_CampaignMonitor();
 		$this->classes['admin_importer_mc4wp']                = new ConvertKit_Admin_Importer_MC4WP();
 		$this->classes['admin_importer_mailpoet']             = new ConvertKit_Admin_Importer_Mailpoet();
 		$this->classes['admin_importer_newsletter']           = new ConvertKit_Admin_Importer_Newsletter();
diff --git a/wp-convertkit.php b/wp-convertkit.php
index 27dc19989..42e498a3c 100644
--- a/wp-convertkit.php
+++ b/wp-convertkit.php
@@ -118,6 +118,7 @@
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer.php';
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-activecampaign.php';
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-aweber.php';
+require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-campaignmonitor.php';
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-mc4wp.php';
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-mailpoet.php';
 require_once CONVERTKIT_PLUGIN_PATH . '/admin/importers/class-convertkit-admin-importer-newsletter.php';

From 14fd36fbde8813485fa449c94c43bf2c06a61e35 Mon Sep 17 00:00:00 2001
From: Tim Carr <tim@n7studios.co.uk>
Date: Wed, 4 Feb 2026 17:13:51 +0800
Subject: [PATCH 4/4] Added Tests

---
 .../class-convertkit-admin-section-tools.php  |   1 +
 ...ttingsToolsImporterCampaignMonitorCest.php | 212 ++++++++++++++++++
 tests/Integration/ImporterTest.php            |  96 ++++++++
 3 files changed, 309 insertions(+)
 create mode 100644 tests/EndToEnd/general/plugin-screens/PluginSettingsToolsImporterCampaignMonitorCest.php

diff --git a/admin/section/class-convertkit-admin-section-tools.php b/admin/section/class-convertkit-admin-section-tools.php
index d3985a31d..e5524230a 100644
--- a/admin/section/class-convertkit-admin-section-tools.php
+++ b/admin/section/class-convertkit-admin-section-tools.php
@@ -59,6 +59,7 @@ public function register_notices( $notices ) {
 				'import_configuration_success'             => __( 'Configuration imported successfully.', 'convertkit' ),
 				'migrate_activecampaign_configuration_success' => __( 'ActiveCampaign forms migrated successfully.', 'convertkit' ),
 				'migrate_aweber_configuration_success'     => __( 'AWeber forms migrated successfully.', 'convertkit' ),
+				'migrate_campaignmonitor_configuration_success' => __( 'Campaign Monitor forms migrated successfully.', 'convertkit' ),
 				'migrate_mc4wp_configuration_success'      => __( 'MC4WP forms migrated successfully.', 'convertkit' ),
 				'migrate_mailpoet_configuration_success'   => __( 'MailPoet forms migrated successfully.', 'convertkit' ),
 				'migrate_newsletter_configuration_success' => __( 'Newsletter forms migrated successfully.', 'convertkit' ),
diff --git a/tests/EndToEnd/general/plugin-screens/PluginSettingsToolsImporterCampaignMonitorCest.php b/tests/EndToEnd/general/plugin-screens/PluginSettingsToolsImporterCampaignMonitorCest.php
new file mode 100644
index 000000000..b8eec7774
--- /dev/null
+++ b/tests/EndToEnd/general/plugin-screens/PluginSettingsToolsImporterCampaignMonitorCest.php
@@ -0,0 +1,212 @@
+<?php
+
+namespace Tests\EndToEnd;
+
+use Tests\Support\EndToEndTester;
+
+/**
+ * Tests for the Settings > Kit > Tools > Import sections for Campaign Monitor.
+ *
+ * @since   3.1.7
+ */
+class PluginSettingsToolsImporterCampaignMonitorCest
+{
+	/**
+	 * Run common actions before running the test functions in this class.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function _before(EndToEndTester $I)
+	{
+		// Activate Plugins.
+		$I->activateKitPlugin($I);
+	}
+
+	/**
+	 * Test that Campaign Monitor Form Shortcodes are replaced with Kit Form Shortcodes when the Tools > Campaign Monitor: Migrate Configuration is configured.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function testCampaignMonitorImportWithShortcodes(EndToEndTester $I)
+	{
+		// Setup Plugin.
+		$I->setupKitPlugin($I);
+		$I->setupKitPluginResources($I);
+
+		// Create Campaign Monitor Forms.
+		$campaignMonitorFormIDs = $this->_createCampaignMonitorForms($I);
+
+		// Insert Campaign Monitor Form Shortcodes into Pages.
+		$pageIDs = $this->_createPagesWithCampaignMonitorFormShortcodes($I, $campaignMonitorFormIDs);
+
+		// Navigate to the Tools screen.
+		$I->loadKitSettingsToolsScreen($I);
+
+		// Select the Kit Forms to replace the Campaign Monitor Forms.
+		foreach ($campaignMonitorFormIDs as $campaignMonitorFormID) {
+			$I->selectOption('_wp_convertkit_integration_campaignmonitor_settings[' . $campaignMonitorFormID . ']', $_ENV['CONVERTKIT_API_FORM_ID']);
+		}
+
+		// Click the Migrate button.
+		$I->click('Migrate');
+
+		// Confirm success message displays.
+		$I->waitForElementVisible('.notice-success');
+		$I->see('Campaign Monitor forms migrated successfully.');
+
+		// View the Pages, to confirm Kit Forms now display.
+		foreach ($pageIDs as $pageID) {
+			$I->amOnPage('?p=' . $pageID);
+			$I->seeElementInDOM('form[data-sv-form]');
+		}
+	}
+
+	/**
+	 * Test that the Campaign Monitor: Migrate Configuration section is not displayed when no Campaign Monitor Forms exist.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function testCampaignMonitorImportWhenNoCampaignMonitorForms(EndToEndTester $I)
+	{
+		// Setup Plugin.
+		$I->setupKitPlugin($I);
+		$I->setupKitPluginResources($I);
+
+		// Navigate to the Tools screen.
+		$I->loadKitSettingsToolsScreen($I);
+
+		// Confirm no Campaign Monitor: Migrate Configuration section is displayed.
+		$I->dontSeeElementInDOM('#import-campaignmonitor');
+	}
+
+	/**
+	 * Test that the Campaign Monitor: Migrate Configuration section is not displayed when Campaign Monitor Forms exist,
+	 * but no Pages, Posts or Custom Posts contain Campaign Monitor Form Shortcodes.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function testCampaignMonitorImportWhenNoCampaignMonitorShortcodesInContent(EndToEndTester $I)
+	{
+		// Setup Plugin.
+		$I->setupKitPlugin($I);
+		$I->setupKitPluginResources($I);
+
+		// Create Campaign Monitor Forms.
+		$this->_createCampaignMonitorForms($I);
+
+		// Navigate to the Tools screen.
+		$I->loadKitSettingsToolsScreen($I);
+
+		// Confirm no Campaign Monitor: Migrate Configuration section is displayed, as there are no
+		// Campaign Monitor Form Shortcodes in the content.
+		$I->dontSeeElementInDOM('#import-campaignmonitor');
+	}
+
+	/**
+	 * Test that the Campaign Monitor: Migrate Configuration section is not displayed when no Kit Forms exist.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function testCampaignMonitorImportWhenNoKitForms(EndToEndTester $I)
+	{
+		// Setup Plugin.
+		$I->setupKitPluginCredentialsNoData($I);
+		$I->setupKitPluginResourcesNoData($I);
+
+		// Navigate to the Tools screen.
+		$I->loadKitSettingsToolsScreen($I);
+
+		// Confirm no Campaign Monitor: Migrate Configuration section is displayed, as there are no
+		// Campaign Monitor Form Shortcodes in the content.
+		$I->dontSeeElementInDOM('#import-campaignmonitor');
+	}
+
+	/**
+	 * Create Campaign Monitor Forms.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 * @return  array
+	 */
+	private function _createCampaignMonitorForms(EndToEndTester $I)
+	{
+		// Create Campaign Monitor Forms in the Plugin Settings.
+		$I->haveOptionInDatabase(
+			'forms_for_campaign_monitor_forms',
+			[
+				'cm_6912dba75db2d' => (object) [
+					'__PHP_Incomplete_Class_Name' => 'forms\core\Form',
+					"\0*\0name"                   => 'Campaign Monitor Form #1',
+				],
+				'cm_6982a693a0095' => (object) [
+					'__PHP_Incomplete_Class_Name' => 'forms\core\Form',
+					"\0*\0name"                   => 'Campaign Monitor Form #2',
+				],
+			]
+		);
+
+		// Return Form IDs.
+		return [ 'cm_6912dba75db2d', 'cm_6982a693a0095' ];
+	}
+
+	/**
+	 * Create Pages with Campaign Monitor Form Shortcodes.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 * @param   array          $campaignMonitorFormIDs  Campaign Monitor Form IDs.
+	 * @return  array
+	 */
+	private function _createPagesWithCampaignMonitorFormShortcodes(EndToEndTester $I, $campaignMonitorFormIDs)
+	{
+		$pageIDs = array();
+
+		foreach ($campaignMonitorFormIDs as $campaignMonitorFormID) {
+			$pageIDs[] = $I->havePostInDatabase(
+				[
+					'post_type'    => 'page',
+					'post_status'  => 'publish',
+					'post_title'   => 'Page with Campaign Monitor Form #' . $campaignMonitorFormID,
+					'post_content' => '[cm_form form_id="' . $campaignMonitorFormID . '"]',
+					'meta_input'   => [
+						'_wp_convertkit_post_meta' => [
+							'form'         => '0',
+							'landing_page' => '',
+							'tag'          => '',
+						],
+					],
+				]
+			);
+		}
+
+		return $pageIDs;
+	}
+
+	/**
+	 * Deactivate and reset Plugin(s) after each test, if the test passes.
+	 * We don't use _after, as this would provide a screenshot of the Plugin
+	 * deactivation and not the true test error.
+	 *
+	 * @since   3.1.7
+	 *
+	 * @param   EndToEndTester $I  Tester.
+	 */
+	public function _passed(EndToEndTester $I)
+	{
+		$I->deactivateKitPlugin($I);
+		$I->dontHaveOptionInDatabase('settings_campaignmonitor');
+		$I->resetKitPlugin($I);
+	}
+}
diff --git a/tests/Integration/ImporterTest.php b/tests/Integration/ImporterTest.php
index 9d39348ab..29336d7f6 100644
--- a/tests/Integration/ImporterTest.php
+++ b/tests/Integration/ImporterTest.php
@@ -386,6 +386,102 @@ public function testAWeberReplaceBlocksInContent()
 		);
 	}
 
+	/**
+	 * Test that the get_form_ids_from_content() method returns Campaign Monitor form shortcode Form IDs
+	 * ignoring any other shortcodes.
+	 *
+	 * @since   3.1.7
+	 */
+	public function testCampaignMonitorGetFormIDsFromContent()
+	{
+		// Initialize the class we want to test.
+		$this->importer = new \ConvertKit_Admin_Importer_CampaignMonitor();
+
+		// Confirm initialization didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $this->importer);
+
+		// Define the content to test.
+		$content = '[cm_form form_id="cm_6912dba75db2d"] some content [cm_form form_id="cm_6982a693a0095"] some other content [aweber formid="12"] different shortcode to ignore';
+
+		// Extract form IDs from content.
+		$form_ids = $this->importer->get_form_ids_from_content( $content );
+
+		// Assert the correct number of form IDs are returned.
+		$this->assertEquals( 2, count( $form_ids ) );
+		$this->assertEquals( 'cm_6912dba75db2d', $form_ids[0] );
+		$this->assertEquals( 'cm_6982a693a0095', $form_ids[1] );
+	}
+
+	/**
+	 * Test that the replace_shortcodes_in_content() method replaces the Campaign Monitor form shortcode with the Kit form shortcode.
+	 *
+	 * @since   3.1.7
+	 */
+	public function testCampaignMonitorReplaceShortcodesInContent()
+	{
+		// Initialize the class we want to test.
+		$this->importer = new \ConvertKit_Admin_Importer_CampaignMonitor();
+
+		// Confirm initialization didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $this->importer);
+
+		// Define the shortcodes to test.
+		$shortcodes = [
+			'[cm_form form_id="cm_6912dba75db2d"]',
+			'[cm_form form_id=cm_6912dba75db2d]',
+		];
+
+		// Test each shortcode is replaced with the Kit form shortcode.
+		foreach ( $shortcodes as $shortcode ) {
+			$this->assertEquals(
+				'[convertkit_form id="' . $_ENV['CONVERTKIT_API_FORM_ID'] . '"]',
+				$this->importer->replace_shortcodes_in_content( $shortcode, 'cm_6912dba75db2d', $_ENV['CONVERTKIT_API_FORM_ID'] )
+			);
+
+			// Prepend and append some content.
+			$content = 'Some content before the shortcode: ' . $shortcode . ' Some content after the shortcode.';
+			$this->assertEquals(
+				'Some content before the shortcode: [convertkit_form id="' . $_ENV['CONVERTKIT_API_FORM_ID'] . '"] Some content after the shortcode.',
+				$this->importer->replace_shortcodes_in_content( $content, 'cm_6912dba75db2d', $_ENV['CONVERTKIT_API_FORM_ID'] )
+			);
+
+			// Prepend and append some content and duplicate the shortcode.
+			$content = 'Some content before the shortcode: ' . $shortcode . ' Some content after the shortcode: ' . $shortcode;
+			$this->assertEquals(
+				'Some content before the shortcode: [convertkit_form id="' . $_ENV['CONVERTKIT_API_FORM_ID'] . '"] Some content after the shortcode: [convertkit_form id="' . $_ENV['CONVERTKIT_API_FORM_ID'] . '"]',
+				$this->importer->replace_shortcodes_in_content( $content, 'cm_6912dba75db2d', $_ENV['CONVERTKIT_API_FORM_ID'] )
+			);
+		}
+	}
+
+	/**
+	 * Test that the replace_shortcodes_in_content() method ignores non-Campaign Monitor shortcodes.
+	 *
+	 * @since   3.1.7
+	 */
+	public function testCampaignMonitorReplaceShortcodesInContentIgnoringOtherShortcodes()
+	{
+		// Initialize the class we want to test.
+		$this->importer = new \ConvertKit_Admin_Importer_CampaignMonitor();
+
+		// Confirm initialization didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $this->importer);
+
+		// Define the shortcodes to test.
+		$shortcodes = [
+			'[convertkit_form id="' . $_ENV['CONVERTKIT_API_FORM_ID'] . '"]',
+			'[a_random_shortcode]',
+		];
+
+		// Test each shortcode is ignored.
+		foreach ( $shortcodes as $shortcode ) {
+			$this->assertEquals(
+				$shortcode,
+				$this->importer->replace_shortcodes_in_content( $shortcode, 'cm_6912dba75db2d', $_ENV['CONVERTKIT_API_FORM_ID'] )
+			);
+		}
+	}
+
 	/**
 	 * Test that the get_form_ids_from_content() method returns MC4WP form shortcode Form IDs
 	 * ignoring any other shortcodes.