diff --git a/app/appConf/base_config.php b/app/appConf/base_config.php
index 612592ca..f7adccca 100644
--- a/app/appConf/base_config.php
+++ b/app/appConf/base_config.php
@@ -2,16 +2,16 @@
 /**
  * Hummingbird Anime List Client
  *
- * An API client for Kitsu and MyAnimeList to manage anime and manga watch lists
+ * An API client for Kitsu to manage anime and manga watch lists
  *
- * PHP version 7
+ * PHP version 8
  *
  * @package     HummingbirdAnimeClient
  * @author      Timothy J. Warren <tim@timshomepage.net>
- * @copyright   2015 - 2017  Timothy J. Warren
+ * @copyright   2015 - 2021  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
- * @version     4.0
- * @link        https://github.com/timw4mail/HummingBirdAnimeClient
+ * @version     5.2
+ * @link        https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
  */
 
 use function Aviat\AnimeClient\loadConfig;
@@ -21,12 +21,13 @@ use function Aviat\AnimeClient\loadConfig;
 //
 // You shouldn't generally need to change anything below this line
 // ----------------------------------------------------------------------------
-$APP_DIR = realpath(__DIR__ . '/../');
-$ROOT_DIR = realpath("{$APP_DIR}/../");
+$APP_DIR = dirname(__DIR__);
+$ROOT_DIR = dirname($APP_DIR);
 
 $tomlConfig = loadConfig(__DIR__);
 
 return array_merge($tomlConfig, [
+	'root' => $ROOT_DIR,
 	'asset_dir' => "{$ROOT_DIR}/public",
 	'base_config_dir' => __DIR__,
 	'config_dir' => "{$APP_DIR}/config",
diff --git a/app/appConf/routes.php b/app/appConf/routes.php
index e5d5de3a..f599c439 100644
--- a/app/appConf/routes.php
+++ b/app/appConf/routes.php
@@ -2,15 +2,15 @@
 /**
  * Hummingbird Anime List Client
  *
- * An API client for Kitsu and MyAnimeList to manage anime and manga watch lists
+ * An API client for Kitsu to manage anime and manga watch lists
  *
- * PHP version 7
+ * PHP version 8
  *
  * @package     HummingbirdAnimeClient
  * @author      Timothy J. Warren <tim@timshomepage.net>
- * @copyright   2015 - 2018  Timothy J. Warren
+ * @copyright   2015 - 2021  Timothy J. Warren
  * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
- * @version     4.0
+ * @version     5.2
  * @link        https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
  */
 
diff --git a/app/bootstrap.php b/app/bootstrap.php
index 7594652c..d9c88629 100644
--- a/app/bootstrap.php
+++ b/app/bootstrap.php
@@ -34,11 +34,11 @@ use Psr\SimpleCache\CacheInterface;
 
 use function Aviat\Ion\_dir;
 
-if ( ! defined('APP_DIR'))
+if ( ! defined('HB_APP_DIR'))
 {
-	define('APP_DIR', __DIR__);
-	define('ROOT_DIR', dirname(APP_DIR));
-	define('TEMPLATE_DIR', _dir(APP_DIR,  'templates'));
+	define('HB_APP_DIR', __DIR__);
+	define('ROOT_DIR', dirname(HB_APP_DIR));
+	define('TEMPLATE_DIR', _dir(HB_APP_DIR,  'templates'));
 }
 
 // -----------------------------------------------------------------------------
@@ -50,7 +50,7 @@ return static function (array $configArray = []): Container {
 	// -------------------------------------------------------------------------
 	// Logging
 	// -------------------------------------------------------------------------
-	$LOG_DIR = _dir(APP_DIR, 'logs');
+	$LOG_DIR = _dir(HB_APP_DIR, 'logs');
 
 	$appLogger = new Logger('animeclient');
 	$appLogger->pushHandler(new RotatingFileHandler(_dir($LOG_DIR, 'app.log'), 2, Logger::WARNING));
diff --git a/build/update_header_comments.php b/build/update_header_comments.php
index e5bf9191..efc9d911 100644
--- a/build/update_header_comments.php
+++ b/build/update_header_comments.php
@@ -2,6 +2,7 @@
 declare(strict_types=1);
 
 $file_patterns = [
+	'app/appConf/*.php',
 	'app/bootstrap.php',
 	'migrations/*.php',
 	'src/**/*.php',
@@ -16,7 +17,7 @@ if ( ! function_exists('glob_recursive'))
 {
 	// Does not support flag GLOB_BRACE
 
-	function glob_recursive($pattern, $flags = 0)
+	function glob_recursive(string $pattern, int $flags = 0): array
 	{
 		$files = glob($pattern, $flags);
 
@@ -57,17 +58,21 @@ function get_text_to_replace(array $tokens): string
 	return $output;
 }
 
-function get_tokens($source): array
+function get_tokens(string $source): array
 {
 	return token_get_all($source);
 }
 
-function replace_files(array $files, $template)
+function replace_files(array $files, string $template): void
 {
 	print_r($files);
 	foreach ($files as $file)
 	{
 		$source = file_get_contents($file);
+		if ($source === FALSE)
+		{
+			continue;
+		}
 
 		if (stripos($source, 'namespace') === FALSE)
 		{
diff --git a/phpstan.neon b/phpstan.neon
index 5a474a6a..168c502d 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -4,6 +4,7 @@ parameters:
 	inferPrivatePropertyTypeFromConstructor: true
 	level: 8
 	paths:
+		- app/appConf
 		- src
 		- ./console
 		- index.php
diff --git a/src/AnimeClient/AnimeClient.php b/src/AnimeClient/AnimeClient.php
index 1a903d89..43518e15 100644
--- a/src/AnimeClient/AnimeClient.php
+++ b/src/AnimeClient/AnimeClient.php
@@ -186,7 +186,7 @@ function checkFolderPermissions(ConfigInterface $config): array
 	$errors = [];
 	$publicDir = $config->get('asset_dir');
 
-	$APP_DIR = _dir(dirname(__DIR__, 2), '/app');
+	$APP_DIR = _dir($config->get('root'), 'app');
 
 	$pathMap = [
 		'app/config' => "{$APP_DIR}/config",
@@ -211,7 +211,9 @@ function checkFolderPermissions(ConfigInterface $config): array
 
 		if ( ! $writable)
 		{
+			// @codeCoverageIgnoreStart
 			$errors['writable'][] = $pretty;
+			// @codeCoverageIgnoreEnd
 		}
 	}
 
@@ -292,6 +294,7 @@ function getLocalImg (string $kitsuUrl, $webp = TRUE): string
 /**
  * Create a transparent placeholder image
  *
+ * @codeCoverageIgnore
  * @param string $path
  * @param int|null $width
  * @param int|null $height
@@ -378,7 +381,6 @@ function colNotEmpty(array $search, string $key): bool
  *
  * @param CacheInterface $cache
  * @return bool
- * @throws Throwable
  */
 function clearCache(CacheInterface $cache): bool
 {
@@ -393,9 +395,7 @@ function clearCache(CacheInterface $cache): bool
 	$userData = array_filter((array)$userData, static fn ($value) => $value !== NULL);
 	$cleared = $cache->clear();
 
-	$saved = ( ! empty($userData))
-		? $cache->setMultiple($userData)
-		: TRUE;
+	$saved = ( ! empty($userData)) ? $cache->setMultiple($userData) : TRUE;
 
 	return $cleared && $saved;
 }
diff --git a/src/AnimeClient/Types/AbstractType.php b/src/AnimeClient/Types/AbstractType.php
index 32766d2e..1dc3b593 100644
--- a/src/AnimeClient/Types/AbstractType.php
+++ b/src/AnimeClient/Types/AbstractType.php
@@ -236,6 +236,9 @@ abstract class AbstractType implements ArrayAccess, Countable {
 		return TRUE;
 	}
 
+	/**
+	 * @codeCoverageIgnore
+	 */
 	final protected function fromObject(mixed $parent = null): float|null|bool|int|array|string
 	{
 		$object = $parent ?? $this;
diff --git a/src/AnimeClient/Types/Config.php b/src/AnimeClient/Types/Config.php
index 9de10ffd..d7b9663c 100644
--- a/src/AnimeClient/Types/Config.php
+++ b/src/AnimeClient/Types/Config.php
@@ -32,6 +32,8 @@ class Config extends AbstractType {
 	// Settings in config.toml
 	// ------------------------------------------------------------------------
 
+	public string $root; // Path to app root
+
 	public ?string $asset_path; // Path to public folder for urls
 
 	/**
@@ -62,8 +64,6 @@ class Config extends AbstractType {
 	/**
 	 * Default list view type
 	 * 'cover_view' or 'list_view'
-	 *
-	 * @var string
 	 */
 	public ?string $default_view_type;
 
@@ -71,21 +71,13 @@ class Config extends AbstractType {
 
 	public bool $secure_urls = TRUE;
 
-	/**
-	 * @var string|bool
-	 */
 	public string|bool $show_anime_collection = FALSE;
 
-	/**
-	 * @var string|bool
-	 */
 	public string|bool $show_manga_collection = FALSE;
 
 	/**
 	 * CSS theme: light, dark, or auto-switching
 	 * 'auto', 'light', or 'dark'
-	 *
-	 * @var string|null
 	 */
 	public ?string $theme = 'auto';
 
diff --git a/tests/AnimeClient/AnimeClientTest.php b/tests/AnimeClient/AnimeClientTest.php
index f5ba4d99..fa75910d 100644
--- a/tests/AnimeClient/AnimeClientTest.php
+++ b/tests/AnimeClient/AnimeClientTest.php
@@ -16,9 +16,11 @@
 
 namespace Aviat\AnimeClient\Tests;
 
-use Amp\Http\Client\Response;
-
 use function Aviat\AnimeClient\arrayToToml;
+use function Aviat\AnimeClient\checkFolderPermissions;
+use function Aviat\AnimeClient\clearCache;
+use function Aviat\AnimeClient\colNotEmpty;
+use function Aviat\AnimeClient\getLocalImg;
 use function Aviat\AnimeClient\getResponse;
 use function Aviat\AnimeClient\isSequentialArray;
 use function Aviat\AnimeClient\tomlToArray;
@@ -89,4 +91,46 @@ class AnimeClientTest extends AnimeClientTestCase
 	{
 		$this->assertNotEmpty(getResponse('https://example.com'));
 	}
+
+	public function testCheckFolderPermissions(): void
+	{
+		$config = $this->container->get('config');
+		$actual = checkFolderPermissions($config);
+		$this->assertTrue(is_array($actual));
+	}
+
+	public function testGetLocalImageEmptyUrl(): void
+	{
+		$actual = getLocalImg('');
+		$this->assertEquals('images/placeholder.webp', $actual);
+	}
+
+	public function testGetLocalImageBadUrl(): void
+	{
+		$actual = getLocalImg('//foo.bar');
+		$this->assertEquals('images/placeholder.webp', $actual);
+	}
+
+	public function testColNotEmpty(): void
+	{
+		$hasEmptyCols = [[
+			'foo' => '',
+		], [
+			'foo' => '',
+		]];
+
+		$hasNonEmptyCols = [[
+			'foo' => 'bar',
+		], [
+			'foo' => 'baz',
+		]];
+
+		$this->assertEquals(false, colNotEmpty($hasEmptyCols, 'foo'));
+		$this->assertEquals(true, colNotEmpty($hasNonEmptyCols, 'foo'));
+	}
+
+	public function testClearCache(): void
+	{
+		$this->assertTrue(clearCache($this->container->get('cache')));
+	}
 }
\ No newline at end of file
diff --git a/tests/AnimeClient/AnimeClientTestCase.php b/tests/AnimeClient/AnimeClientTestCase.php
index 88a2db62..3da703f2 100644
--- a/tests/AnimeClient/AnimeClientTestCase.php
+++ b/tests/AnimeClient/AnimeClientTestCase.php
@@ -16,6 +16,7 @@
 
 namespace Aviat\AnimeClient\Tests;
 
+use Aviat\Ion\Di\ContainerInterface;
 use function Aviat\Ion\_dir;
 
 use Aviat\Ion\Json;
@@ -59,6 +60,7 @@ class AnimeClientTestCase extends TestCase {
 		parent::setUp();
 
 		$config_array = [
+			'root' => self::ROOT_DIR,
 			'asset_path' => '/assets',
 			'img_cache_path' => _dir(self::ROOT_DIR, 'public/images'),
 			'data_cache_path' => _dir(self::TEST_DATA_DIR, 'cache'),
@@ -94,7 +96,7 @@ class AnimeClientTestCase extends TestCase {
 		];
 
 		// Set up DI container
-		$di = require _dir(self::ROOT_DIR, 'app', 'bootstrap.php');
+		$di = require self::ROOT_DIR .  '/app/bootstrap.php';
 		$container = $di($config_array);
 
 		// Use mock session handler
diff --git a/tests/AnimeClient/Types/ConfigTest.php b/tests/AnimeClient/Types/ConfigTest.php
new file mode 100644
index 00000000..76ae05e6
--- /dev/null
+++ b/tests/AnimeClient/Types/ConfigTest.php
@@ -0,0 +1,53 @@
+<?php declare(strict_types=1);
+/**
+ * Hummingbird Anime List Client
+ *
+ * An API client for Kitsu to manage anime and manga watch lists
+ *
+ * PHP version 8
+ *
+ * @package     HummingbirdAnimeClient
+ * @author      Timothy J. Warren <tim@timshomepage.net>
+ * @copyright   2015 - 2021  Timothy J. Warren
+ * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version     5.2
+ * @link        https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
+ */
+
+namespace Aviat\AnimeClient\Tests\Types;
+
+use Aviat\AnimeClient\Types\Config;
+use Aviat\AnimeClient\Types\UndefinedPropertyException;
+
+class ConfigTest extends ConfigTestCase {
+	public function setUp(): void
+	{
+		parent::setUp();
+
+		$this->testClass = Config::class;
+	}
+
+	public function testSetMethods(): void
+	{
+		$type = $this->testClass::from([
+			'anilist' => [],
+			'cache' => [],
+			'database' => [],
+		]);
+
+		$this->assertEquals(3, $type->count());
+	}
+
+	public function testOffsetUnset(): void
+	{
+		$type = $this->testClass::from([
+			'anilist' => [],
+		]);
+
+		$this->assertTrue($type->offsetExists('anilist'));
+
+		$type->offsetUnset('anilist');
+
+		$this->assertNotTrue($type->offsetExists('anilist'));
+	}
+}
\ No newline at end of file
diff --git a/tests/AnimeClient/Types/ConfigTestCase.php b/tests/AnimeClient/Types/ConfigTestCase.php
new file mode 100644
index 00000000..1106117f
--- /dev/null
+++ b/tests/AnimeClient/Types/ConfigTestCase.php
@@ -0,0 +1,72 @@
+<?php declare(strict_types=1);
+/**
+ * Hummingbird Anime List Client
+ *
+ * An API client for Kitsu to manage anime and manga watch lists
+ *
+ * PHP version 8
+ *
+ * @package     HummingbirdAnimeClient
+ * @author      Timothy J. Warren <tim@timshomepage.net>
+ * @copyright   2015 - 2021  Timothy J. Warren
+ * @license     http://www.opensource.org/licenses/mit-license.html  MIT License
+ * @version     5.2
+ * @link        https://git.timshomepage.net/timw4mail/HummingBirdAnimeClient
+ */
+
+namespace Aviat\AnimeClient\Tests\Types;
+
+use Aviat\AnimeClient\Tests\AnimeClientTestCase;
+use Aviat\AnimeClient\Types\UndefinedPropertyException;
+
+abstract class ConfigTestCase extends AnimeClientTestCase {
+	public string $testClass;
+
+	public function testCheck(): void
+	{
+		$result = $this->testClass::check([]);
+		$this->assertEquals([], $result);
+	}
+
+	public function testSetUndefinedProperty(): void
+	{
+		$this->expectException(UndefinedPropertyException::class);
+		$this->testClass::from([
+			'foobar' => 'baz',
+		]);
+	}
+
+	public function testToString(): void
+	{
+		$actual = $this->testClass::from([])->__toString();
+		$this->assertMatchesSnapshot($actual);
+	}
+
+	public function testOffsetExists(): void
+	{
+		$actual = $this->testClass::from([
+			'anilist' => [],
+		])->offsetExists('anilist');
+		$this->assertTrue($actual);
+	}
+
+	public function testSetState(): void
+	{
+		$normal = $this->testClass::from([]);
+		$setState = $this->testClass::__set_state([]);
+
+		$this->assertEquals($normal, $setState);
+	}
+
+	public function testIsEmpty(): void
+	{
+		$type = $this->testClass::from([]);
+		$this->assertTrue($type->isEmpty());
+	}
+
+	public function testCount(): void
+	{
+		$type = $this->testClass::from([]);
+		$this->assertEquals(0, $type->count());
+	}
+}
\ No newline at end of file
diff --git a/tests/AnimeClient/Types/__snapshots__/ConfigTest__testToString__1.txt b/tests/AnimeClient/Types/__snapshots__/ConfigTest__testToString__1.txt
new file mode 100644
index 00000000..5663ee41
--- /dev/null
+++ b/tests/AnimeClient/Types/__snapshots__/ConfigTest__testToString__1.txt
@@ -0,0 +1,3 @@
+Aviat\AnimeClient\Types\Config Object
+(
+)