diff --git a/.gitignore b/.gitignore
index 37ce5fa..126ec8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 vendor
 *.log
 *.pem
+.phpunit.result.cache
diff --git a/src/Orbit/Config.php b/src/Orbit/Config.php
index 8f1a4c6..f107a0e 100644
--- a/src/Orbit/Config.php
+++ b/src/Orbit/Config.php
@@ -53,21 +53,31 @@ class Config
      * @param string $filename Path to ini file
      * @return void
      */
-    public function readFromIniFile(string $filename)
+    public function readFromIniFile(string $filename): void
     {
         if (!file_exists($filename) || !is_readable($filename)) {
             throw new \Exception("Cannot read config file '$filename'");
         }
 
         $ini = parse_ini_file($filename);
+        $this->readFromArray($ini);
+    }
 
+    /**
+     * Read config values from array
+     *
+     * @param array $data Array of config values
+     * @return void
+     */
+    public function readFromArray(array $params): void
+    {
         $valid_keys = [
             'host', 'port', 'hostname', 'tls_certfile',
             'tls_keyfile', 'keypassphrase', 'log_file', 'log_level',
-            'root_dir', 'index_file', 'enable_directory_index'
+            'root_dir', 'index_file', 'enable_directory_index',
         ];
 
-        foreach ($ini as $key => $value) {
+        foreach ($params as $key => $value) {
             if (!in_array($key, $valid_keys)) {
                 continue;
             }
diff --git a/src/Orbit/Module.php b/src/Orbit/Module.php
index 46e49fb..7897970 100644
--- a/src/Orbit/Module.php
+++ b/src/Orbit/Module.php
@@ -11,7 +11,7 @@ use Monolog\Logger;
  *
  * @package Orbit
  */
-class Module
+class Module implements ModuleInterface
 {
     protected $config;
     protected $logger;
@@ -28,4 +28,16 @@ class Module
         $this->config = $config;
         $this->logger = $logger;
     }
+
+    /**
+     * Handle
+     *
+     * Take a request and return a response
+     *
+     * This should be implemented in a child class
+     */
+    public function handle(Request $request): array
+    {
+        return [true, new Response()];
+    }
 }
diff --git a/src/Orbit/Module/Statics.php b/src/Orbit/Module/Statics.php
index fbb75fc..a5e8772 100644
--- a/src/Orbit/Module/Statics.php
+++ b/src/Orbit/Module/Statics.php
@@ -14,15 +14,17 @@ use Orbit\Response;
  */
 class Statics extends Module
 {
+    const WORLD_READABLE = 0x0004;
+
     /**
      * Handle a request and generate a proper response
      *
      * @param Request $request The request object
-     * @param Response $response The already created response object
-     * @param string $real_root_dir The real path to root on disk
      */
-    public function handleResponse(Request $request, Response $response, $real_root_dir): array
+    public function handle(Request $request): array
     {
+        $response = new Response();
+        $real_root_dir = realpath($this->config->root_dir);
         $resource_path = rtrim($real_root_dir, "/") . $request->path;
 
         // Check if within the server root
@@ -31,7 +33,7 @@ class Statics extends Module
         if ($realpath && strpos($realpath, $real_root_dir) !== 0) {
             $response->setStatus(Response::STATUS_PERMANENT_FAILURE);
             $response->setMeta("Invalid location");
-            return [true, $response];
+            return [false, $response];
         }
 
         if (is_dir($resource_path)) {
@@ -39,7 +41,7 @@ class Statics extends Module
             if ($resource_path[-1] != "/") {
                 $response->setStatus(Response::STATUS_REDIRECT_PERMANENT);
                 $response->setMeta($request->getUrlAppendPath('/'));
-                return [true, $response];
+                return [false, $response];
             }
 
             // Check if index file exists
@@ -47,9 +49,9 @@ class Statics extends Module
                 $resource_path = $resource_path . DIRECTORY_SEPARATOR . $this->config->index_file;
             } else {
                 if (!$this->config->enable_directory_index) {
-                    $response->setStatus(Response::STATUS_BAD_REQUEST);
+                    $response->setStatus(Response::STATUS_NOT_FOUND);
                     $response->setMeta('Path not available');
-                    return [true, $response];
+                    return [false, $response];
                 } else {
                     $response->setStatus(Response::STATUS_SUCCESS);
                     $response->setMeta('text/gemini');
@@ -60,22 +62,21 @@ class Statics extends Module
         }
 
         // File exists and is world readable
-        if (file_exists($resource_path) && self::isWorldReadble($resource_path)) {
+        if (file_exists($resource_path) && self::isWorldReadable($resource_path)) {
             $response->setStatus(Response::STATUS_SUCCESS);
 
             $pathinfo = pathinfo($resource_path);
 
-            // TODO : handle files without extensions
-            if (!isset($pathinfo['extension'])) {
-                $response->setStatus(Response::STATUS_TEMPORARY_FAILURE);
-                $response->setMeta('Error reading resource');
-                return [true, $response];
+            if (isset($pathinfo['extension'])) {
+                $meta = $this->getCustomMimeFromFileExtension($pathinfo['extension']);
+                if (!$meta) {
+                    $meta = mime_content_type($resource_path);
+                }
+            } else {
+                // Use finfo_file to detect type
+                $meta = finfo_file(finfo_open(FILEINFO_MIME), $resource_path);
             }
 
-            $meta = $this->getCustomMimeFromFileExtension($pathinfo['extension']);
-            if (!$meta) {
-                $meta = mime_content_type($resource_path);
-            }
             $response->setMeta($meta);
             $response->setStaticFile($resource_path);
         } else {
@@ -123,8 +124,12 @@ class Statics extends Module
     {
         $files = glob($path . "*");
 
-        $body = "# Directory listing " . str_replace($root, '', $path) . "\n\n";
-        $body .= "=> " . str_replace($root, '', dirname($path)) . " ..\n";
+        $body = "# Directory listing " . str_replace($root, '', $path) . "/\n\n";
+
+        if ($path != $root . "/") {
+            // If not already at root, provide option to go up one parent
+            $body .= "=> " . str_replace($root, '', dirname($path)) . "/ ..\n";
+        }
 
         foreach ($files as $file) {
             $relative_path = str_replace($path, '', $file);
@@ -149,4 +154,15 @@ class Statics extends Module
 
         return $body;
     }
+
+    /**
+     * Report whether a given file is world readable or not
+     *
+     * @param string $file The file to check
+     * @return bool
+     */
+    public static function isWorldReadable(string $file): bool
+    {
+        return (bool)(fileperms($file) & self::WORLD_READABLE);
+    }
 }
diff --git a/src/Orbit/ModuleInterface.php b/src/Orbit/ModuleInterface.php
new file mode 100644
index 0000000..f8e9f41
--- /dev/null
+++ b/src/Orbit/ModuleInterface.php
@@ -0,0 +1,26 @@
+<?php declare(strict_types=1);
+
+namespace Orbit;
+
+use Monolog\Logger;
+
+/**
+ * Module interface
+ *
+ * This represents some work that a request->response handler can do
+ *
+ * @package Orbit
+ */
+interface ModuleInterface
+{
+    /**
+     * Handle
+     *
+     * Take a request and generate a response
+     *
+     * Must return an array with two values: [bool, Response];
+     * The first value (bool) must indicate whether the response should
+     * continue on or if it should be returned immediately to the client.
+     */
+    public function handle(Request $request): array;
+}
diff --git a/src/Orbit/Response.php b/src/Orbit/Response.php
index 0415f32..f868874 100644
--- a/src/Orbit/Response.php
+++ b/src/Orbit/Response.php
@@ -60,7 +60,7 @@ class Response
     }
 
     /**
-     * Send data to client
+     * Send response body to client
      *
      * @param resource $client
      * @return int|false Number of bytes written
@@ -152,11 +152,21 @@ class Response
      * @param int $status
      * @return void
      */
-    public function setStatus($status): void
+    public function setStatus(int $status): void
     {
         $this->status = $status;
     }
 
+    /**
+     * Get status
+     *
+     * @return int
+     */
+    public function getStatus(): int
+    {
+        return $this->status;
+    }
+
     /**
      * Set response meta value
      *
@@ -167,4 +177,14 @@ class Response
     {
         $this->meta = $meta;
     }
+
+    /**
+     * Get meta
+     *
+     * @return string Meta value
+     */
+    public function getMeta(): string
+    {
+        return $this->meta;
+    }
 }
diff --git a/src/Orbit/Server.php b/src/Orbit/Server.php
index 869782d..f4ce88c 100644
--- a/src/Orbit/Server.php
+++ b/src/Orbit/Server.php
@@ -16,7 +16,6 @@ use Orbit\Module\Statics;
 class Server
 {
     const SCHEME = "gemini";
-    const WORLD_READABLE = 0x0004;
 
     public static $version = "0.4";
 
@@ -29,7 +28,6 @@ class Server
     private $connections = []; // Incoming client connections
     private $peers = []; // Client connections to read from
     private $metas = []; // Meta data for each client connection
-    private $real_root_dir;
 
     /**
      * Constructor
@@ -84,21 +82,17 @@ class Server
     /**
      * Listen and handle incoming requests
      *
-     * @param mixed $root_dir The root directory from which to serve files
      * @return void
      */
-    public function listen($root_dir = null): void
+    public function listen(): void
     {
-        if (null == $root_dir) {
-            $root_dir = $this->config->root_dir;
-        }
+        $root_dir = $this->config->root_dir;
 
         if (!is_dir($root_dir)) {
             throw new \Exception("Error: Root directory '$root_dir' not a directory");
         }
 
-        $this->real_root_dir = realpath($root_dir);
-        $this->logger->debug(sprintf("Root directory '%s'", $this->real_root_dir));
+        $this->logger->debug(sprintf("Root directory '%s'", realpath($root_dir)));
 
         $server = stream_socket_server(
             $this->getListenAddress(),
@@ -201,7 +195,7 @@ class Server
             $request = new Request($request_buffer);
 
             // Respond to client
-            $response = $this->handleResponse($request);
+            $response = $this->handle($request);
             $size = 0;
 
             try {
@@ -229,7 +223,7 @@ class Server
      * @param Request $request
      * @return Response
      */
-    public function handleResponse(Request $request): Response
+    public function handle(Request $request): Response
     {
         [$is_valid, $response] = $this->validateRequest($request);
         if ($is_valid === false) {
@@ -239,22 +233,11 @@ class Server
         }
 
         $statics_module = new Statics($this->config, $this->logger);
-        [$success, $response] = $statics_module->handleResponse($request, $response, $this->real_root_dir);
+        [$success, $response] = $statics_module->handle($request);
 
         return $response;
     }
 
-    /**
-     * Report whether a given file is world readable or not
-     *
-     * @param string $file The file to check
-     * @return bool
-     */
-    public static function isWorldReadble(string $file): bool
-    {
-        return (bool)(fileperms($file) & self::WORLD_READABLE);
-    }
-
     /**
      * Prune any lingering connections
      *
diff --git a/tests/src/Orbit/Module/StaticsTest.php b/tests/src/Orbit/Module/StaticsTest.php
new file mode 100644
index 0000000..d431330
--- /dev/null
+++ b/tests/src/Orbit/Module/StaticsTest.php
@@ -0,0 +1,191 @@
+<?php declare(strict_types=1);
+
+namespace Orbit\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Monolog\Logger;
+
+use Orbit\Config;
+use Orbit\Module\Statics;
+use Orbit\Request;
+use Orbit\Response;
+
+final class StaticsTest extends TestCase
+{
+    public function makeObject($config_params = []): Statics
+    {
+        $config = new Config();
+        $config->readFromArray($config_params);
+        $statics = new Statics($config, new Logger('test-orbit'));
+        return $statics;
+    }
+
+    public function testConstruct(): void
+    {
+        $statics = new Statics(new Config(), new Logger('test-orbit'));
+        $this->assertInstanceOf(Statics::class, $statics);
+    }
+
+    public function testHandle(): void
+    {
+        $statics = $this->makeObject();
+        $request = new Request('lmnop');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_NOT_FOUND, $response->getStatus());
+        $this->assertTrue($success);
+    }
+
+    public function testHandleFileAttemptAboveRoot(): void
+    {
+        $statics = $this->makeObject();
+        $request = new Request('/../README.md');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_PERMANENT_FAILURE, $response->getStatus());
+        $this->assertFalse($success);
+    }
+
+    public function testHandleDirectoryWithRedirect(): void
+    {
+        @mkdir('dir1');
+
+        $statics = $this->makeObject();
+        $request = new Request('/dir1');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_REDIRECT_PERMANENT, $response->getStatus());
+        $this->assertSame('gemini:///dir1/', $response->getMeta());
+        $this->assertFalse($success);
+
+        @rmdir('dir1');
+    }
+
+    public function testHandleDirectoryWithIndexFile(): void
+    {
+        @mkdir('dir1');
+        file_put_contents('dir1/index.gmi', '# Sunlit lands');
+
+        $statics = $this->makeObject();
+        $request = new Request('/dir1/');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_SUCCESS, $response->getStatus());
+        $this->assertSame('# Sunlit lands', $response->getBody());
+        $this->assertTrue($success);
+
+        unlink('dir1/index.gmi');
+        @rmdir('dir1');
+    }
+
+    public function testHandleNoDirectoryIndex(): void
+    {
+        @mkdir('dir1');
+
+        $statics = $this->makeObject(['enable_directory_index' => false]);
+        $request = new Request('/dir1/');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_NOT_FOUND, $response->getStatus());
+        $this->assertSame('Path not available', $response->getMeta());
+        $this->assertFalse($success);
+
+        @rmdir('dir1');
+    }
+
+    public function testHandleCustomDirectoryIndex(): void
+    {
+        @mkdir('dir1');
+        file_put_contents('dir1/INDEX', '# Welcome to index');
+
+        $statics = $this->makeObject(['index_file' => 'INDEX']);
+        $request = new Request('/dir1/');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_SUCCESS, $response->getStatus());
+        $this->assertStringContainsString('text/plain', $response->getMeta());
+        $this->assertStringContainsString('# Welcome to index', $response->getBody());
+        $this->assertTrue($success);
+
+        @unlink('dir1/INDEX');
+        @rmdir('dir1');
+    }
+
+    public function testHandleMakeDirectoryIndex(): void
+    {
+        @mkdir('dir1');
+        file_put_contents('dir1/abc.txt', 'ABCDEF');
+        file_put_contents('dir1/def.txt', 'XFFFF');
+
+        $statics = $this->makeObject(['enable_directory_index' => true]);
+        $request = new Request('/dir1/');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_SUCCESS, $response->getStatus());
+        $this->assertSame('text/gemini', $response->getMeta());
+        $this->assertStringContainsString('abc.txt', $response->getBody());
+        $this->assertTrue($success);
+
+        @unlink('dir1/abc.txt');
+        @unlink('dir1/def.txt');
+        @rmdir('dir1');
+    }
+
+    public function testHandleFileNotFound(): void
+    {
+        $statics = $this->makeObject();
+        $request = new Request('foobar.txt');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_NOT_FOUND, $response->getStatus());
+        $this->assertSame('Not found!', $response->getMeta());
+        $this->assertTrue($success);
+    }
+
+    public function testCustomMimeTypes(): void
+    {
+        file_put_contents('xyz.gmi', '# Make it great');
+
+        $statics = $this->makeObject();
+        $request = new Request('/xyz.gmi');
+
+        [$success, $response] = $statics->handle($request);
+        $this->assertSame(Response::STATUS_SUCCESS, $response->getStatus());
+        $this->assertSame('text/gemini', $response->getMeta());
+        $this->assertTrue($success);
+
+        unlink('xyz.gmi');
+    }
+
+    public function testGetCustomMimeFromFileExtension(): void
+    {
+        $statics = $this->makeObject();
+
+        $this->assertEquals('text/gemini', $statics->getCustomMimeFromFileExtension('gmi'));
+        $this->assertEquals('text/gemini', $statics->getCustomMimeFromFileExtension('gemini'));
+        $this->assertEquals('text/gemini', $statics->getCustomMimeFromFileExtension('md'));
+        $this->assertEquals('text/gemini', $statics->getCustomMimeFromFileExtension('markdown'));
+        $this->assertEquals('text/x-ansi', $statics->getCustomMimeFromFileExtension('ans'));
+        $this->assertEquals('text/x-ansi', $statics->getCustomMimeFromFileExtension('ansi'));
+        $this->assertEquals('', $statics->getCustomMimeFromFileExtension('hoo-haw'));
+    }
+
+    public function testMakeDirectoryIndexWithSubdirs(): void
+    {
+        mkdir('dir1');
+        mkdir('dir1/sub1');
+        file_put_contents('dir1/foo.txt', 'foo1');
+        file_put_contents('dir1/sub1/bar.txt', 'bar1');
+
+        $statics = $this->makeObject();
+        $results = $statics->makeDirectoryIndex('', realpath('./'));
+        $this->assertStringContainsString('# Directory listing', $results);
+        $this->assertStringContainsString('=> / ..', $results);
+        $this->assertStringContainsString('=> dir1/ dir1/', $results);
+
+        unlink('dir1/foo.txt');
+        unlink('dir1/sub1/bar.txt');
+        rmdir('dir1/sub1');
+        rmdir('dir1');
+    }
+}
diff --git a/tests/src/Orbit/ModuleTest.php b/tests/src/Orbit/ModuleTest.php
new file mode 100644
index 0000000..d43038b
--- /dev/null
+++ b/tests/src/Orbit/ModuleTest.php
@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace Orbit\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Monolog\Logger;
+
+use Orbit\Config;
+use Orbit\Module;
+use Orbit\Request;
+use Orbit\Response;
+
+final class ModuleTest extends TestCase
+{
+    public function testConstruct(): void
+    {
+        $module = new Module(new Config(), new Logger('foobar'));
+        $this->assertInstanceOf(Module::class, $module);
+    }
+
+    public function testHandle(): void
+    {
+        $module = new Module(new Config(), new Logger('foobar'));
+        [$success, $response] = $module->handle(new Request('foobar'));
+
+        $this->assertTrue($success);
+        $this->assertInstanceOf(Response::class, $response);
+    }
+}