diff --git a/app/src/Providers/TwigProvider.php b/app/src/Providers/TwigProvider.php
index d9586a9..c5af2ed 100644
--- a/app/src/Providers/TwigProvider.php
+++ b/app/src/Providers/TwigProvider.php
@@ -4,6 +4,7 @@ namespace App\Providers;
 
 use App\ViewFunctions;
 use DI\Container;
+use Invoker\CallableResolver;
 use PHLAK\Config\Config;
 use Slim\Views\Twig;
 use Twig\Extension\CoreExtension;
@@ -30,16 +31,24 @@ class TwigProvider
     /** @var Config Application config */
     protected $config;
 
+    /** @var CallableResolver The callable resolver */
+    protected $callableResolver;
+
     /**
      * Create a new ViewProvider object.
      *
-     * @param \DI\Container        $container
-     * @param \PHLAK\Config\Config $config
+     * @param \DI\Container             $container
+     * @param \PHLAK\Config\Config      $config
+     * @param \Invoker\CallableResolver $callableResolver
      */
-    public function __construct(Container $container, Config $config)
-    {
+    public function __construct(
+        Container $container,
+        Config $config,
+        CallableResolver $callableResolver
+    ) {
         $this->container = $container;
         $this->config = $config;
+        $this->callableResolver = $callableResolver;
     }
 
     /**
@@ -60,7 +69,7 @@ class TwigProvider
         );
 
         foreach (self::VIEW_FUNCTIONS as $function) {
-            $function = new $function($this->container, $this->config);
+            $function = $this->callableResolver->resolve($function);
 
             $twig->getEnvironment()->addFunction(
                 new TwigFunction($function->name(), $function)
diff --git a/app/src/ViewFunctions/Asset.php b/app/src/ViewFunctions/Asset.php
index 5d31957..36cae89 100644
--- a/app/src/ViewFunctions/Asset.php
+++ b/app/src/ViewFunctions/Asset.php
@@ -2,6 +2,7 @@
 
 namespace App\ViewFunctions;
 
+use DI\Container;
 use Tightenco\Collect\Support\Collection;
 
 class Asset extends ViewFunction
@@ -12,6 +13,19 @@ class Asset extends ViewFunction
     /** @var string The function name */
     protected $name = 'asset';
 
+    /** @var Container The application container */
+    protected $container;
+
+    /**
+     * Create a new Asset object.
+     *
+     * @param \DI\Container $container
+     */
+    public function __construct(Container $container)
+    {
+        $this->container = $container;
+    }
+
     /**
      * Return the path to an asset.
      *
diff --git a/app/src/ViewFunctions/Breadcrumbs.php b/app/src/ViewFunctions/Breadcrumbs.php
index c1809bd..94188ed 100644
--- a/app/src/ViewFunctions/Breadcrumbs.php
+++ b/app/src/ViewFunctions/Breadcrumbs.php
@@ -2,6 +2,7 @@
 
 namespace App\ViewFunctions;
 
+use DI\Container;
 use Tightenco\Collect\Support\Collection;
 
 class Breadcrumbs extends ViewFunction
@@ -9,6 +10,20 @@ class Breadcrumbs extends ViewFunction
     /** @var string The function name */
     protected $name = 'breadcrumbs';
 
+    /** @var Container The application container */
+    protected $container;
+
+    /**
+     * Create a new Breadcrumbs object.
+     *
+     * @param \DI\Container        $container
+     * @param \PHLAK\Config\Config $config
+     */
+    public function __construct(Container $container)
+    {
+        $this->container = $container;
+    }
+
     /**
      * Build an array of breadcrumbs for a given path.
      *
diff --git a/app/src/ViewFunctions/Config.php b/app/src/ViewFunctions/Config.php
index bdecf9b..625ad22 100644
--- a/app/src/ViewFunctions/Config.php
+++ b/app/src/ViewFunctions/Config.php
@@ -2,11 +2,26 @@
 
 namespace App\ViewFunctions;
 
+use PHLAK\Config\Config as AppConfig;
+
 class Config extends ViewFunction
 {
     /** @var string The function name */
     protected $name = 'config';
 
+    /** @var \PHLAK\Config\Config */
+    protected $config;
+
+    /**
+     * Create a new Config object.
+     *
+     * @param \PHLAK\Config\Config $config
+     */
+    public function __construct(AppConfig $config)
+    {
+        $this->config = $config;
+    }
+
     /**
      * Retrieve an item from the view config.
      *
diff --git a/app/src/ViewFunctions/Icon.php b/app/src/ViewFunctions/Icon.php
index 721eb93..e6085f6 100644
--- a/app/src/ViewFunctions/Icon.php
+++ b/app/src/ViewFunctions/Icon.php
@@ -2,6 +2,7 @@
 
 namespace App\ViewFunctions;
 
+use PHLAK\Config\Config;
 use Symfony\Component\Finder\SplFileInfo;
 
 class Icon extends ViewFunction
@@ -9,6 +10,19 @@ class Icon extends ViewFunction
     /** @var string The function name */
     protected $name = 'icon';
 
+    /** @var \PHLAK\Config\Config */
+    protected $config;
+
+    /**
+     * Create a new Config object.
+     *
+     * @param \PHLAK\Config\Config $config
+     */
+    public function __construct(Config $config)
+    {
+        $this->config = $config;
+    }
+
     /**
      * Retrieve the icon markup for a file.
      *
diff --git a/app/src/ViewFunctions/ViewFunction.php b/app/src/ViewFunctions/ViewFunction.php
index 0ade628..99dd404 100644
--- a/app/src/ViewFunctions/ViewFunction.php
+++ b/app/src/ViewFunctions/ViewFunction.php
@@ -2,31 +2,11 @@
 
 namespace App\ViewFunctions;
 
-use DI\Container;
-use PHLAK\Config\Config;
-
 abstract class ViewFunction
 {
     /** @var string The function name */
     protected $name = '';
 
-    /** @var Container The application container */
-    protected $container;
-
-    /** @var Config App configuration component */
-    protected $config;
-
-    /**
-     * Create a new ViewFunction object.
-     *
-     * @param \PHLAK\Config\Config $config
-     */
-    public function __construct(Container $container, Config $config)
-    {
-        $this->container = $container;
-        $this->config = $config;
-    }
-
     /**
      * Get the function name.
      *
diff --git a/tests/Exceptions/ErrorHandlerTest.php b/tests/Exceptions/ErrorHandlerTest.php
index fbc609d..751445a 100644
--- a/tests/Exceptions/ErrorHandlerTest.php
+++ b/tests/Exceptions/ErrorHandlerTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Tests\Bootstrap;
+namespace Tests\Exceptions;
 
 use App\Exceptions\ErrorHandler;
 use App\Providers\TwigProvider;
diff --git a/tests/Handlers/SearchHandlerTest.php b/tests/Handlers/SearchHandlerTest.php
index ae23a39..ceb94a4 100644
--- a/tests/Handlers/SearchHandlerTest.php
+++ b/tests/Handlers/SearchHandlerTest.php
@@ -17,7 +17,7 @@ class SearchHandlerTest extends TestCase
     {
         $this->container->call(TwigProvider::class);
 
-        $handler = new SearchHandler(new Finder, $this->container->get(Twig::class));
+        $handler = new SearchHandler(new Finder, $this->container->get(Twig::class), $this->translator);
 
         $request = $this->createMock(Request::class);
         $request->method('getQueryParams')->willReturn(['search' => 'charlie']);
@@ -32,7 +32,7 @@ class SearchHandlerTest extends TestCase
     {
         $this->container->call(TwigProvider::class);
 
-        $handler = new SearchHandler(new Finder, $this->container->get(Twig::class));
+        $handler = new SearchHandler(new Finder, $this->container->get(Twig::class), $this->translator);
 
         $request = $this->createMock(Request::class);
         $request->method('getQueryParams')->willReturn(['search' => '']);
diff --git a/tests/Providers/TwigProviderTest.php b/tests/Providers/TwigProviderTest.php
index 44c4e6f..59a13df 100644
--- a/tests/Providers/TwigProviderTest.php
+++ b/tests/Providers/TwigProviderTest.php
@@ -4,6 +4,7 @@ namespace Tests\Providers;
 
 use App\Providers\TwigProvider;
 use App\ViewFunctions;
+use Invoker\CallableResolver;
 use PHLAK\Config\Config;
 use Slim\Views\Twig;
 use Tests\TestCase;
@@ -12,7 +13,8 @@ class TwigProviderTest extends TestCase
 {
     public function test_it_can_compose_the_view_component(): void
     {
-        (new TwigProvider($this->container, new Config))();
+        $callableResolver = $this->container->get(CallableResolver::class);
+        (new TwigProvider($this->container, new Config, $callableResolver))();
 
         $twig = $this->container->get(Twig::class);
 
diff --git a/tests/ViewFunctions/ConfigTest.php b/tests/ViewFunctions/ConfigTest.php
index 792dc24..1fc6103 100644
--- a/tests/ViewFunctions/ConfigTest.php
+++ b/tests/ViewFunctions/ConfigTest.php
@@ -26,14 +26,14 @@ class ConfigTest extends TestCase
 
     public function test_it_can_retrieve_a_config_item(): void
     {
-        $config = new Config($this->container, $this->config);
+        $config = new Config($this->config);
 
         $this->assertEquals('Test value; please ignore', $config('foo'));
     }
 
     public function test_it_returns_a_default_value(): void
     {
-        $config = new Config($this->container, $this->config);
+        $config = new Config($this->config);
 
         $this->assertEquals('Default value', $config('bar', 'Default value'));
     }
diff --git a/tests/ViewFunctions/IconTest.php b/tests/ViewFunctions/IconTest.php
index 96b32db..f48a292 100644
--- a/tests/ViewFunctions/IconTest.php
+++ b/tests/ViewFunctions/IconTest.php
@@ -26,7 +26,7 @@ class IconTest extends TestCase
 
     public function test_it_can_return_icon_markup_for_a_file(): void
     {
-        $icon = new Icon($this->container, $this->config);
+        $icon = new Icon($this->config);
         $file = $this->createMock(SplFileInfo::class);
         $file->method('isDir')->willReturn(false);
         $file->method('getExtension')->willReturn('php');
@@ -36,7 +36,7 @@ class IconTest extends TestCase
 
     public function test_it_can_return_icon_markup_for_a_directory(): void
     {
-        $icon = new Icon($this->container, $this->config);
+        $icon = new Icon($this->config);
         $file = $this->createMock(SplFileInfo::class);
         $file->method('isDir')->willReturn(true);
 
@@ -45,7 +45,7 @@ class IconTest extends TestCase
 
     public function test_it_can_return_the_default_icon_markup(): void
     {
-        $icon = new Icon($this->container, $this->config);
+        $icon = new Icon($this->config);
         $file = $this->createMock(SplFileInfo::class);
         $file->method('isDir')->willReturn(false);
         $file->method('getExtension')->willReturn('default');