diff --git a/src/Helpers.php b/src/Helpers.php
index 9c232d8a..15fcf429 100644
--- a/src/Helpers.php
+++ b/src/Helpers.php
@@ -135,7 +135,7 @@ public static function get_proxy_resource( $resource_name = '' ) {
 		/**
 		 * Create the cache directory if it doesn't exist.
 		 */
-		if ( $resource_name === 'cache_dir' && ! is_dir( $resources[ $resource_name ] ) ) {
+		if ( ( $resource_name === 'cache_dir' || $resource_name === 'cache_url' ) && ! is_dir( $resources[ 'cache_dir' ] ) ) {
 			wp_mkdir_p( $resources[ $resource_name ] );
 		}
 
@@ -193,7 +193,7 @@ public static function update_setting( $option_name, $option_value ) {
 	}
 
 	/**
-	 * A convenient way to retrieve the absolute path to the local JS file.
+	 * A convenient way to retrieve the absolute path to the local JS file. Proxy should be enabled when this method is called!
 	 * @return string
 	 * @throws Exception
 	 */
@@ -202,7 +202,7 @@ public static function get_js_path() {
 	}
 
 	/**
-	 * Downloads the plausible.js file to this server.
+	 * Downloads a remote file to this server.
 	 * @since 1.3.0
 	 *
 	 * @param string $local_file  Absolute path to where to store the $remote_file.
diff --git a/tests/integration/HelpersTest.php b/tests/integration/HelpersTest.php
new file mode 100644
index 00000000..a23fe81a
--- /dev/null
+++ b/tests/integration/HelpersTest.php
@@ -0,0 +1,261 @@
+<?php
+/**
+ * @package Plausible Analytics Integration Tests - Helpers
+ */
+
+namespace Plausible\Analytics\Tests\Integration;
+
+use Plausible\Analytics\Tests\TestCase;
+use Plausible\Analytics\WP\Helpers;
+
+class HelpersTest extends TestCase {
+	/**
+	 * @see Helpers::get_js_url()
+	 */
+	public function testGetJsUrl() {
+		$url = Helpers::get_js_url();
+
+		$this->assertEquals( 'https://plausible.io/js/plausible.js', $url );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$url = Helpers::get_js_url( true );
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$this->assertMatchesRegularExpression( '~http://example.org/wp-content/uploads/.*?/.*?.js~', $url );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableSelfHostedDomain' ] );
+
+		$url = Helpers::get_js_url();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableSelfHostedDomain' ] );
+
+		$this->assertEquals( 'https://self-hosted-test.org/js/plausible.js', $url );
+	}
+
+	/**
+	 * Enable the proxy.
+	 *
+	 * @param $settings
+	 *
+	 * @return mixed
+	 */
+	public function enableProxy( $settings ) {
+		$settings[ 'proxy_enabled' ] = 'on';
+
+		return $settings;
+	}
+
+	/**
+	 * Enable Self Hosted domain.
+	 *
+	 * @param $settings
+	 *
+	 * @return mixed
+	 */
+	public function enableSelfHostedDomain( $settings ) {
+		$settings[ 'self_hosted_domain' ] = 'self-hosted-test.org';
+
+		return $settings;
+	}
+
+	/**
+	 * @see Helpers::get_filename()
+	 */
+	public function testGetFilename() {
+		add_filter( 'plausible_analytics_settings', [ $this, 'addExcludedPages' ] );
+
+		$filename = Helpers::get_filename();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'addExcludedPages' ] );
+
+		$this->assertEquals( 'plausible.exclusions', $filename );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$filename = Helpers::get_filename( true );
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$this->assertMatchesRegularExpression( '~[a-z0-9]{8}~', $filename );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableOutboundLinks' ] );
+
+		$filename = Helpers::get_filename();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableOutboundLinks' ] );
+
+		$this->assertEquals( 'plausible.outbound-links', $filename );
+	}
+
+	/**
+	 * Enable excluded pages option.
+	 *
+	 * @param $settings
+	 *
+	 * @return mixed
+	 */
+	public function addExcludedPages( $settings ) {
+		$settings[ 'excluded_pages' ] = 'test';
+
+		return $settings;
+	}
+
+	/**
+	 * Enable Enhanced Measurements > Outbound Links.
+	 *
+	 * @param $settings
+	 *
+	 * @return mixed
+	 */
+	public function enableOutboundLinks( $settings ) {
+		$settings[ 'enhanced_measurements' ] = [ 'outbound-links' ];
+
+		return $settings;
+	}
+
+	/**
+	 * @see Helpers::get_proxy_resource()
+	 * @return void
+	 * @throws \Exception
+	 */
+	public function testGetProxyResource() {
+		$namespace = Helpers::get_proxy_resource( 'namespace' );
+
+		$this->assertMatchesRegularExpression( '/[a-z0-9]{6}/', $namespace );
+
+		$base = Helpers::get_proxy_resource( 'base' );
+
+		$this->assertMatchesRegularExpression( '/[a-z0-9]{4}/', $base );
+
+		$endpoint = Helpers::get_proxy_resource( 'endpoint' );
+
+		$this->assertMatchesRegularExpression( '/[a-z0-9]{8}/', $endpoint );
+
+		$cache_dir  = Helpers::get_proxy_resource( 'cache_dir' );
+		$upload_dir = wp_get_upload_dir()[ 'basedir' ];
+
+		$this->assertMatchesRegularExpression( "~$upload_dir/[a-z0-9]{10}/~", $cache_dir );
+		$this->assertTrue( is_dir( $cache_dir ) );
+
+		$cache_url  = Helpers::get_proxy_resource( 'cache_url' );
+		$upload_url = wp_get_upload_dir()[ 'baseurl' ];
+
+		$this->assertMatchesRegularExpression( "~$upload_url/[a-z0-9]{10}/~", $cache_url );
+
+		$file_alias = Helpers::get_proxy_resource( 'file_alias' );
+
+		$this->assertMatchesRegularExpression( '/[a-z0-9]{8}/', $file_alias );
+	}
+
+	/**
+	 * @see Helpers::update_setting()
+	 * @return void
+	 */
+	public function testUpdateSetting() {
+		Helpers::update_setting( 'test', true );
+
+		$this->assertTrue( Helpers::get_settings()[ 'test' ] );
+	}
+
+	/**
+	 * @see Helpers::get_js_path()
+	 * @return void
+	 * @throws \Exception
+	 */
+	public function testGetJsPath() {
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$path = Helpers::get_js_path();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$upload_dir = wp_get_upload_dir()[ 'basedir' ];
+
+		$this->assertMatchesRegularExpression( "~$upload_dir/[a-z0-9]{10}/[a-z0-9]{8}\.js~", $path );
+	}
+
+	/**
+	 * @see Helpers::download_file()
+	 * @return void
+	 * @throws \Exception
+	 */
+	public function testDownloadFile() {
+		Helpers::download_file( 'https://plausible.io/js/plausible.js', wp_get_upload_dir()[ 'basedir' ] . '/test.js' );
+
+		$this->assertFileExists( wp_get_upload_dir()[ 'basedir' ] . '/test.js' );
+	}
+
+	/**
+	 * @see Helpers::get_domain()
+	 * @return void
+	 */
+	public function testGetDomain() {
+		$domain = Helpers::get_domain();
+
+		$this->assertEquals( 'example.org', $domain );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'setDomain' ] );
+
+		$domain = Helpers::get_domain();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'setDomain' ] );
+
+		$this->assertEquals( 'test.dev', $domain );
+	}
+
+	/**
+	 * Set domain_name option.
+	 *
+	 * @param $settings
+	 *
+	 * @return mixed
+	 */
+	public function setDomain( $settings ) {
+		$settings[ 'domain_name' ] = 'test.dev';
+
+		return $settings;
+	}
+
+	/**
+	 * @see Helpers::get_data_api_url()
+	 * @return void
+	 */
+	public function testGetDataApiUrl() {
+		$url = Helpers::get_data_api_url();
+
+		$this->assertEquals( 'https://plausible.io/api/event', $url );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$url = Helpers::get_data_api_url();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableProxy' ] );
+
+		$this->assertMatchesRegularExpression( '~http://example.org/index.php\?rest_route=/[0-9a-z]{6}/v1/[0-9a-z]{4}/[0-9a-z]{8}~', $url );
+
+		add_filter( 'plausible_analytics_settings', [ $this, 'enableSelfHostedDomain' ] );
+
+		$url = Helpers::get_data_api_url();
+
+		remove_filter( 'plausible_analytics_settings', [ $this, 'enableSelfHostedDomain' ] );
+
+		$this->assertEquals( 'https://self-hosted-test.org/api/event', $url );
+	}
+
+	/**
+	 * @see Helpers::get_rest_endpoint()
+	 * @return void
+	 * @throws \Exception
+	 */
+	public function testGetRestEndpoint() {
+		$endpoint = Helpers::get_rest_endpoint( false );
+
+		$this->assertMatchesRegularExpression( '~/wp-json/[0-9a-z]{6}/v1/[0-9a-z]{4}/[0-9a-z]{8}~', $endpoint );
+
+		$endpoint = Helpers::get_rest_endpoint();
+
+		$this->assertMatchesRegularExpression( '~http://example.org/index.php\?rest_route=/[0-9a-z]{6}/v1/[0-9a-z]{4}/[0-9a-z]{8}~', $endpoint );
+	}
+}
diff --git a/tests/integration/PluginTest.php b/tests/integration/PluginTest.php
index 655af160..29cfebab 100644
--- a/tests/integration/PluginTest.php
+++ b/tests/integration/PluginTest.php
@@ -10,7 +10,7 @@
 
 class PluginTest extends TestCase {
 	/**
-	 *
+	 * @see Plugin::register()
 	 */
 	public function testRegister() {
 		$class = new Plugin();