From 2d48034f14ba668ba8660101df85003115cbd460 Mon Sep 17 00:00:00 2001
From: Tim Carr <tim@n7studios.co.uk>
Date: Fri, 12 Dec 2025 23:25:13 +0800
Subject: [PATCH] Tests: Add Resource Tests

---
 .../ResourceCustomFieldsNoDataTest.php        | 196 +++++++++++
 .../Integration/ResourceCustomFieldsTest.php  | 276 ++++++++++++++++
 tests/Integration/ResourceFormsNoDataTest.php | 196 +++++++++++
 tests/Integration/ResourceFormsTest.php       | 304 ++++++++++++++++++
 .../ResourceSequencesNoDataTest.php           | 196 +++++++++++
 tests/Integration/ResourceSequencesTest.php   | 270 ++++++++++++++++
 tests/Integration/ResourceTagsNoDataTest.php  | 196 +++++++++++
 tests/Integration/ResourceTagsTest.php        | 270 ++++++++++++++++
 8 files changed, 1904 insertions(+)
 create mode 100644 tests/Integration/ResourceCustomFieldsNoDataTest.php
 create mode 100644 tests/Integration/ResourceCustomFieldsTest.php
 create mode 100644 tests/Integration/ResourceFormsNoDataTest.php
 create mode 100644 tests/Integration/ResourceFormsTest.php
 create mode 100644 tests/Integration/ResourceSequencesNoDataTest.php
 create mode 100644 tests/Integration/ResourceSequencesTest.php
 create mode 100644 tests/Integration/ResourceTagsNoDataTest.php
 create mode 100644 tests/Integration/ResourceTagsTest.php

diff --git a/tests/Integration/ResourceCustomFieldsNoDataTest.php b/tests/Integration/ResourceCustomFieldsNoDataTest.php
new file mode 100644
index 0000000..0b7be03
--- /dev/null
+++ b/tests/Integration/ResourceCustomFieldsNoDataTest.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Custom_Fields class when no data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceCustomFieldsNoDataTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Custom_Fields
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-custom-fields.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Custom_Fields( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->refresh();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Test that the get() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->get();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns false, because resources do not exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, false);
+	}
+}
diff --git a/tests/Integration/ResourceCustomFieldsTest.php b/tests/Integration/ResourceCustomFieldsTest.php
new file mode 100644
index 0000000..30e7dad
--- /dev/null
+++ b/tests/Integration/ResourceCustomFieldsTest.php
@@ -0,0 +1,276 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Custom_Fields class when data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceCustomFieldsTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Custom_Fields
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-custom-fields.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Custom_Fields( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that the data is stored in the options table and includes some expected keys.
+		$result = $this->resource->refresh();
+		$this->assertIsArray($result);
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical ascending order
+	 * by default.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+		$this->assertArrayHasKey('key', reset($result));
+		$this->assertArrayHasKey('label', reset($result));
+
+		// Assert order of data is in ascending alphabetical order.
+		$this->assertEquals('Billing Address', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('URL', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical descending order
+	 * when a valid order_by and order properties are defined.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithValidOrderByAndOrder()
+	{
+		// Define order_by and order.
+		$this->resource->order_by = 'key';
+		$this->resource->order    = 'desc';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+		$this->assertArrayHasKey('key', reset($result));
+		$this->assertArrayHasKey('label', reset($result));
+
+		// Assert order of data is in descending alphabetical order.
+		$this->assertEquals('url', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('billing_address', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in their original order
+	 * when populated with Forms and an invalid order_by value is specified.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithInvalidOrderBy()
+	{
+		// Define order_by with an invalid value (i.e. an array key that does not exist).
+		$this->resource->order_by = 'invalid_key';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+		$this->assertArrayHasKey('key', reset($result));
+		$this->assertArrayHasKey('label', reset($result));
+
+		// Assert order of data has not changed.
+		$this->assertEquals('URL', reset($result)['label']);
+		$this->assertEquals('Notes', end($result)['label']);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, true);
+	}
+}
diff --git a/tests/Integration/ResourceFormsNoDataTest.php b/tests/Integration/ResourceFormsNoDataTest.php
new file mode 100644
index 0000000..43dd735
--- /dev/null
+++ b/tests/Integration/ResourceFormsNoDataTest.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Forms class when no data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceFormsNoDataTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Forms
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-forms.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Forms( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->refresh();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Test that the get() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->get();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns false, because no resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, false);
+	}
+}
diff --git a/tests/Integration/ResourceFormsTest.php b/tests/Integration/ResourceFormsTest.php
new file mode 100644
index 0000000..836daaa
--- /dev/null
+++ b/tests/Integration/ResourceFormsTest.php
@@ -0,0 +1,304 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Forms class when data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceFormsTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Forms
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-forms.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Forms( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that the data is stored in the options table and includes some expected keys.
+		$result = $this->resource->refresh();
+		$this->assertIsArray($result);
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical ascending order
+	 * by default.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in ascending alphabetical order.
+		$this->assertEquals('AAA Test', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('WooCommerce Product Form', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical descending order
+	 * when a valid order_by and order properties are defined.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithValidOrderByAndOrder()
+	{
+		// Define order_by and order.
+		$this->resource->order_by = 'name';
+		$this->resource->order    = 'desc';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in descending alphabetical order.
+		$this->assertEquals('WooCommerce Product Form', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('AAA Test', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in their original order
+	 * when populated with Forms and an invalid order_by value is specified.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithInvalidOrderBy()
+	{
+		// Define order_by with an invalid value (i.e. an array key that does not exist).
+		$this->resource->order_by = 'invalid_key';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data has not changed.
+		$this->assertEquals('WPForms Form', reset($result)['name']);
+		$this->assertEquals('Legacy Form', end($result)['name']);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, true);
+	}
+
+
+	/**
+	 * Test that the is_legacy() function returns true for a Legacy Form ID.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testIsLegacyFormWithLegacyFormID()
+	{
+		$this->resource->refresh();
+		$this->assertTrue($this->resource->is_legacy($_ENV['CONVERTKIT_API_LEGACY_FORM_ID']));
+	}
+
+	/**
+	 * Test that the is_legacy() function returns false for a non-Legacy Form ID.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testIsLegacyFormWithFormID()
+	{
+		$this->resource->refresh();
+		$this->assertFalse($this->resource->is_legacy($_ENV['CONVERTKIT_API_FORM_ID']));
+	}
+
+	/**
+	 * Test that the is_legacy() function returns false for an invalid Form ID.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testIsLegacyFormWithInvalidFormID()
+	{
+		$this->resource->refresh();
+		$this->assertFalse($this->resource->is_legacy(12345));
+	}
+}
diff --git a/tests/Integration/ResourceSequencesNoDataTest.php b/tests/Integration/ResourceSequencesNoDataTest.php
new file mode 100644
index 0000000..5a65962
--- /dev/null
+++ b/tests/Integration/ResourceSequencesNoDataTest.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Sequences class when no data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceSequencesNoDataTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Sequences
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-sequences.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Sequences( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->refresh();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Test that the get() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->get();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because no resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, false);
+	}
+}
diff --git a/tests/Integration/ResourceSequencesTest.php b/tests/Integration/ResourceSequencesTest.php
new file mode 100644
index 0000000..44ff76b
--- /dev/null
+++ b/tests/Integration/ResourceSequencesTest.php
@@ -0,0 +1,270 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Sequences class when data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceSequencesTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Sequences
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-sequences.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Sequences( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that the data is stored in the options table and includes some expected keys.
+		$result = $this->resource->refresh();
+		$this->assertIsArray($result);
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical ascending order
+	 * by default.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in ascending alphabetical order.
+		$this->assertEquals('Another Sequence', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('WordPress Sequence', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical descending order
+	 * when a valid order_by and order properties are defined.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithValidOrderByAndOrder()
+	{
+		// Define order_by and order.
+		$this->resource->order_by = 'name';
+		$this->resource->order    = 'desc';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in descending alphabetical order.
+		$this->assertEquals('WordPress Sequence', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('Another Sequence', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in their original order
+	 * when populated with Forms and an invalid order_by value is specified.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithInvalidOrderBy()
+	{
+		// Define order_by with an invalid value (i.e. an array key that does not exist).
+		$this->resource->order_by = 'invalid_key';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data has not changed.
+		$this->assertEquals('Another Sequence', reset($result)['name']);
+		$this->assertEquals('WordPress Sequence', end($result)['name']);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, true);
+	}
+}
diff --git a/tests/Integration/ResourceTagsNoDataTest.php b/tests/Integration/ResourceTagsNoDataTest.php
new file mode 100644
index 0000000..e7e8352
--- /dev/null
+++ b/tests/Integration/ResourceTagsNoDataTest.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Tags class when no data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceTagsNoDataTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Tags
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-tags.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN_NO_DATA'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN_NO_DATA']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Tags( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->refresh();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Test that the get() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Confirm that no resources exist in the stored options table data.
+		$result = $this->resource->get();
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+		$this->assertIsArray($result);
+		$this->assertCount(0, $result);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because no resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, false);
+	}
+}
diff --git a/tests/Integration/ResourceTagsTest.php b/tests/Integration/ResourceTagsTest.php
new file mode 100644
index 0000000..5015565
--- /dev/null
+++ b/tests/Integration/ResourceTagsTest.php
@@ -0,0 +1,270 @@
+<?php
+
+namespace Tests;
+
+use lucatume\WPBrowser\TestCase\WPTestCase;
+
+/**
+ * Tests for the Integrate_ConvertKit_WPForms_Resource_Tags class when data is present in the API.
+ *
+ * @since   1.8.9
+ */
+class ResourceTagsTest extends \Codeception\TestCase\WPTestCase
+{
+	/**
+	 * The testing implementation.
+	 *
+	 * @var \WpunitTester
+	 */
+	protected $tester;
+
+	/**
+	 * Holds the API instance.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_API
+	 */
+	private $api;
+
+	/**
+	 * Holds the ConvertKit Resource class.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     Integrate_ConvertKit_WPForms_Resource_Tags
+	 */
+	private $resource;
+
+	/**
+	 * Holds the WPForms Account ID to store the Access Token and Refresh Token in WPForms's settings.
+	 *
+	 * @since   1.8.9
+	 *
+	 * @var     string
+	 */
+	protected $wpforms_account_id = 'kit-unit-test';
+
+	/**
+	 * Performs actions before each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		// Activate Plugin, to include the Plugin's constants in tests.
+		activate_plugins('wpforms-lite/wpforms.php');
+		activate_plugins('convertkit-wpforms/integrate-convertkit-wpforms.php');
+
+		// Include classes from /includes to test, as they won't be loaded by the Plugin
+		// because WPForms is not active.
+		require_once 'includes/class-integrate-convertkit-wpforms-api.php';
+		require_once 'includes/class-integrate-convertkit-wpforms-resource-tags.php';
+
+		// Storing Access Token and Refresh Token in WPForms's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => $_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+				'refresh_token' => $_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN'],
+				'token_expires' => time() + 10000,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Initialize the API instance.
+		$this->api = new \Integrate_ConvertKit_WPForms_API(
+			$_ENV['CONVERTKIT_OAUTH_CLIENT_ID'],
+			$_ENV['CONVERTKIT_OAUTH_REDIRECT_URI'],
+			$_ENV['CONVERTKIT_OAUTH_ACCESS_TOKEN'],
+			$_ENV['CONVERTKIT_OAUTH_REFRESH_TOKEN']
+		);
+
+		// Initialize the resource class we want to test with the API instance and WPForms Account ID.
+		$this->resource = new \Integrate_ConvertKit_WPForms_Resource_Tags( $this->api, $this->wpforms_account_id );
+		$this->assertNotInstanceOf(\WP_Error::class, $this->resource->resources);
+
+		// Initialize the resource class, fetching resources from the API and caching them in the options table.
+		$result = $this->resource->init();
+
+		// Confirm calling init() didn't result in an error.
+		$this->assertNotInstanceOf(\WP_Error::class, $result);
+	}
+
+	/**
+	 * Performs actions after each test.
+	 *
+	 * @since   1.8.9
+	 */
+	public function tearDown(): void
+	{
+		// Disable integration, removing Access Token and Refresh Token from Plugin's settings.
+		wpforms_update_providers_options(
+			'convertkit',
+			array(
+				'access_token'  => '',
+				'refresh_token' => '',
+				'token_expires' => 0,
+				'label'         => 'ConvertKit WordPress',
+				'date'          => time(),
+			),
+			$this->wpforms_account_id
+		);
+
+		// Delete Resources from options table.
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id);
+		delete_option($this->resource->settings_name . '_' . $this->wpforms_account_id . '_last_queried');
+
+		// Destroy the classes we tested.
+		unset($this->api);
+		unset($this->resource);
+
+		parent::tearDown();
+	}
+
+	/**
+	 * Test that the refresh() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testRefresh()
+	{
+		// Confirm that the data is stored in the options table and includes some expected keys.
+		$result = $this->resource->refresh();
+		$this->assertIsArray($result);
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+	}
+
+	/**
+	 * Test that the expiry timestamp is set and returns the expected value.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExpiry()
+	{
+		// Define the expected expiry date based on the resource class' $cache_duration setting.
+		$expectedExpiryDate = date('Y-m-d', time() + $this->resource->cache_duration);
+
+		// Fetch the actual expiry date set when the resource class was initialized.
+		$expiryDate = date('Y-m-d', $this->resource->last_queried + $this->resource->cache_duration);
+
+		// Confirm both dates match.
+		$this->assertEquals($expectedExpiryDate, $expiryDate);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical ascending order
+	 * by default.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGet()
+	{
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in ascending alphabetical order.
+		$this->assertEquals('gravityforms-tag-1', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('wpforms', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in alphabetical descending order
+	 * when a valid order_by and order properties are defined.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithValidOrderByAndOrder()
+	{
+		// Define order_by and order.
+		$this->resource->order_by = 'name';
+		$this->resource->order    = 'desc';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data is in ascending alphabetical order.
+		$this->assertEquals('wpforms', reset($result)[ $this->resource->order_by ]);
+		$this->assertEquals('gravityforms-tag-1', end($result)[ $this->resource->order_by ]);
+	}
+
+	/**
+	 * Tests that the get() function returns resources in their original order
+	 * when populated with Forms and an invalid order_by value is specified.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testGetWithInvalidOrderBy()
+	{
+		// Define order_by with an invalid value (i.e. an array key that does not exist).
+		$this->resource->order_by = 'invalid_key';
+
+		// Call resource class' get() function.
+		$result = $this->resource->get();
+
+		// Assert result is an array.
+		$this->assertIsArray($result);
+
+		// Assert top level array keys are preserved.
+		$this->assertArrayHasKey(array_key_first($this->resource->resources), $result);
+		$this->assertArrayHasKey(array_key_last($this->resource->resources), $result);
+
+		// Assert resource within results has expected array keys.
+		$this->assertArrayHasKey('id', reset($result));
+		$this->assertArrayHasKey('name', reset($result));
+
+		// Assert order of data has not changed.
+		$this->assertEquals('wpforms', reset($result)['name']);
+		$this->assertEquals('wordpress', end($result)['name']);
+	}
+
+	/**
+	 * Test that the count() function returns the number of resources.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testCount()
+	{
+		$result = $this->resource->get();
+		$this->assertEquals($this->resource->count(), count($result));
+	}
+
+	/**
+	 * Test that the exist() function performs as expected.
+	 *
+	 * @since   1.8.9
+	 */
+	public function testExist()
+	{
+		// Confirm that the function returns true, because resources exist.
+		$result = $this->resource->exist();
+		$this->assertSame($result, true);
+	}
+}