diff --git a/app/Http/Controllers/CurrencyController.php b/app/Http/Controllers/CurrencyController.php
index a88eeb65d0..c0b2fd4258 100644
--- a/app/Http/Controllers/CurrencyController.php
+++ b/app/Http/Controllers/CurrencyController.php
@@ -5,12 +5,13 @@ use FireflyIII\Http\Requests;
 use FireflyIII\Http\Requests\CurrencyFormRequest;
 use FireflyIII\Models\Transaction;
 use FireflyIII\Models\TransactionCurrency;
+use FireflyIII\Repositories\Currency\CurrencyRepositoryInterface;
 use Input;
 use Preferences;
 use Redirect;
 use Session;
-use View;
 use URL;
+use View;
 
 /**
  * Class CurrencyController
@@ -56,9 +57,7 @@ class CurrencyController extends Controller
     public function defaultCurrency(TransactionCurrency $currency)
     {
 
-        $currencyPreference       = Preferences::get('currencyPreference', 'EUR');
-        $currencyPreference->data = $currency->code;
-        $currencyPreference->save();
+        Preferences::set('currencyPreference', $currency->code);
 
         Session::flash('success', $currency->name . ' is now the default currency.');
         Cache::forget('FFCURRENCYSYMBOL');
@@ -73,17 +72,18 @@ class CurrencyController extends Controller
      *
      * @return \Illuminate\Http\RedirectResponse|\Illuminate\View\View
      */
-    public function delete(TransactionCurrency $currency)
+    public function delete(TransactionCurrency $currency, CurrencyRepositoryInterface $repository)
     {
-        if ($currency->transactionJournals()->count() > 0) {
-            Session::flash('error', 'Cannot delete ' . e($currency->name) . ' because there are still transactions attached to it.');
 
-            // put previous url in session
-            Session::put('currency.delete.url', URL::previous());
+        if ($repository->countJournals($currency) > 0) {
+            Session::flash('error', 'Cannot delete ' . e($currency->name) . ' because there are still transactions attached to it.');
 
             return Redirect::route('currency.index');
         }
 
+        // put previous url in session
+        Session::put('currency.delete.url', URL::previous());
+
 
         return view('currency.delete', compact('currency'));
     }
@@ -93,10 +93,10 @@ class CurrencyController extends Controller
      *
      * @return \Illuminate\Http\RedirectResponse
      */
-    public function destroy(TransactionCurrency $currency)
+    public function destroy(TransactionCurrency $currency, CurrencyRepositoryInterface $repository)
     {
-        if ($currency->transactionJournals()->count() > 0) {
-            Session::flash('error', 'Cannot delete ' . e($currency->name) . ' because there are still transactions attached to it.');
+        if ($repository->countJournals($currency) > 0) {
+            Session::flash('error', 'Cannot destroy ' . e($currency->name) . ' because there are still transactions attached to it.');
 
             return Redirect::route('currency.index');
         }
@@ -132,12 +132,10 @@ class CurrencyController extends Controller
     /**
      * @return \Illuminate\View\View
      */
-    public function index()
+    public function index(CurrencyRepositoryInterface $repository)
     {
-        $currencies         = TransactionCurrency::get();
-        $currencyPreference = Preferences::get('currencyPreference', 'EUR');
-        $defaultCurrency    = TransactionCurrency::whereCode($currencyPreference->data)->first();
-
+        $currencies      = $repository->get();
+        $defaultCurrency = $repository->getCurrencyByPreference(Preferences::get('currencyPreference', 'EUR'));
 
         return view('currency.index', compact('currencies', 'defaultCurrency'));
     }
@@ -147,28 +145,22 @@ class CurrencyController extends Controller
      *
      * @return $this|\Illuminate\Http\RedirectResponse
      */
-    public function store(CurrencyFormRequest $request)
+    public function store(CurrencyFormRequest $request, CurrencyRepositoryInterface $repository)
     {
+        $data     = $request->getCurrencyData();
+        $currency = $repository->store($data);
 
 
-        // no repository, because the currency controller is relatively simple.
-        $currency = TransactionCurrency::create(
-            [
-                'name'   => $request->get('name'),
-                'code'   => $request->get('code'),
-                'symbol' => $request->get('symbol'),
-            ]
-        );
-
         Session::flash('success', 'Currency "' . $currency->name . '" created');
 
         if (intval(Input::get('create_another')) === 1) {
             Session::put('currency.create.fromStore', true);
+
             return Redirect::route('currency.create')->withInput();
         }
 
         // redirect to previous URL.
-        return Redirect::to(Session::get('categories.create.url'));
+        return Redirect::to(Session::get('currency.create.url'));
 
 
     }
@@ -178,19 +170,17 @@ class CurrencyController extends Controller
      *
      * @return $this|\Illuminate\Http\RedirectResponse
      */
-    public function update(TransactionCurrency $currency, CurrencyFormRequest $request)
+    public function update(TransactionCurrency $currency, CurrencyFormRequest $request, CurrencyRepositoryInterface $repository)
     {
-
-        $currency->code   = $request->get('code');
-        $currency->symbol = $request->get('symbol');
-        $currency->name   = $request->get('name');
-        $currency->save();
+        $data     = $request->getCurrencyData();
+        $currency = $repository->update($currency, $data);
 
         Session::flash('success', 'Currency "' . e($currency->name) . '" updated.');
 
 
         if (intval(Input::get('return_to_edit')) === 1) {
             Session::put('currency.edit.fromUpdate', true);
+
             return Redirect::route('currency.edit', $currency->id);
         }
 
diff --git a/app/Http/Requests/CurrencyFormRequest.php b/app/Http/Requests/CurrencyFormRequest.php
index d45716d6d4..96b471790e 100644
--- a/app/Http/Requests/CurrencyFormRequest.php
+++ b/app/Http/Requests/CurrencyFormRequest.php
@@ -21,6 +21,18 @@ class CurrencyFormRequest extends Request
         return Auth::check();
     }
 
+    /**
+     * @return array
+     */
+    public function getCurrencyData()
+    {
+        return [
+            'name'   => $this->get('name'),
+            'code'   => $this->get('code'),
+            'symbol' => $this->get('symbol'),
+        ];
+    }
+
     /**
      * @return array
      */
diff --git a/app/Providers/FireflyServiceProvider.php b/app/Providers/FireflyServiceProvider.php
index 923012a4dc..113a25c433 100644
--- a/app/Providers/FireflyServiceProvider.php
+++ b/app/Providers/FireflyServiceProvider.php
@@ -62,6 +62,7 @@ class FireflyServiceProvider extends ServiceProvider
         $this->app->bind('FireflyIII\Repositories\Journal\JournalRepositoryInterface', 'FireflyIII\Repositories\Journal\JournalRepository');
         $this->app->bind('FireflyIII\Repositories\Bill\BillRepositoryInterface', 'FireflyIII\Repositories\Bill\BillRepository');
         $this->app->bind('FireflyIII\Repositories\PiggyBank\PiggyBankRepositoryInterface', 'FireflyIII\Repositories\PiggyBank\PiggyBankRepository');
+        $this->app->bind('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface', 'FireflyIII\Repositories\Currency\CurrencyRepository');
         $this->app->bind('FireflyIII\Support\Search\SearchInterface', 'FireflyIII\Support\Search\Search');
 
 
diff --git a/app/Repositories/Currency/CurrencyRepository.php b/app/Repositories/Currency/CurrencyRepository.php
new file mode 100644
index 0000000000..bffdc88c94
--- /dev/null
+++ b/app/Repositories/Currency/CurrencyRepository.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace FireflyIII\Repositories\Currency;
+
+
+use FireflyIII\Models\Preference;
+use FireflyIII\Models\TransactionCurrency;
+use Illuminate\Support\Collection;
+
+/**
+ * Class CurrencyRepository
+ *
+ * @package FireflyIII\Repositories\Currency
+ */
+class CurrencyRepository implements CurrencyRepositoryInterface
+{
+
+    /**
+     * @param TransactionCurrency $currency
+     *
+     * @return int
+     */
+    public function countJournals(TransactionCurrency $currency)
+    {
+        return $currency->transactionJournals()->count();
+    }
+
+    /**
+     * @return Collection
+     */
+    public function get()
+    {
+        return TransactionCurrency::get();
+    }
+
+    /**
+     * @param Preference $preference
+     *
+     * @return TransactionCurrency
+     */
+    public function getCurrencyByPreference(Preference $preference)
+    {
+        $preferred = TransactionCurrency::whereCode($preference->data)->first();
+        if (is_null($preferred)) {
+            $preferred = TransactionCurrency::first();
+        }
+
+        return $preferred;
+    }
+
+    /**
+     * @param array $data
+     *
+     * @return TransactionCurrency
+     */
+    public function store(array $data)
+    {
+        $currency = TransactionCurrency::create(
+            [
+                'name'   => $data['name'],
+                'code'   => $data['code'],
+                'symbol' => $data['symbol'],
+            ]
+        );
+
+        return $currency;
+    }
+
+    /**
+     * @param TransactionCurrency $currency
+     * @param array               $data
+     *
+     * @return TransactionCurrency
+     */
+    public function update(TransactionCurrency $currency, array $data)
+    {
+        $currency->code   = $data['code'];
+        $currency->symbol = $data['symbol'];
+        $currency->name   = $data['name'];
+        $currency->save();
+
+        return $currency;
+    }
+}
\ No newline at end of file
diff --git a/app/Repositories/Currency/CurrencyRepositoryInterface.php b/app/Repositories/Currency/CurrencyRepositoryInterface.php
new file mode 100644
index 0000000000..cfb72467ba
--- /dev/null
+++ b/app/Repositories/Currency/CurrencyRepositoryInterface.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace FireflyIII\Repositories\Currency;
+
+
+use FireflyIII\Models\Preference;
+use FireflyIII\Models\TransactionCurrency;
+use Illuminate\Support\Collection;
+
+/**
+ * Interface CurrencyRepositoryInterface
+ *
+ * @package FireflyIII\Repositories\Currency
+ */
+interface CurrencyRepositoryInterface
+{
+
+    /**
+     * @param TransactionCurrency $currency
+     *
+     * @return int
+     */
+    public function countJournals(TransactionCurrency $currency);
+
+    /**
+     * @return Collection
+     */
+    public function get();
+
+    /**
+     * @param Preference $preference
+     *
+     * @return TransactionCurrency
+     */
+    public function getCurrencyByPreference(Preference $preference);
+
+    /**
+     * @param array $data
+     *
+     * @return TransactionCurrency
+     */
+    public function store(array $data);
+
+    /**
+     * @param TransactionCurrency $currency
+     * @param array               $data
+     *
+     * @return TransactionCurrency
+     */
+    public function update(TransactionCurrency $currency, array $data);
+
+}
\ No newline at end of file
diff --git a/tests/controllers/CurrencyControllerTest.php b/tests/controllers/CurrencyControllerTest.php
new file mode 100644
index 0000000000..b06e1cb67a
--- /dev/null
+++ b/tests/controllers/CurrencyControllerTest.php
@@ -0,0 +1,217 @@
+<?php
+use Illuminate\Support\Collection;
+use League\FactoryMuffin\Facade as FactoryMuffin;
+
+/**
+ * Class CurrencyControllerTest
+ */
+class CurrencyControllerTest extends TestCase
+{
+    /**
+     * Sets up the fixture, for example, opens a network connection.
+     * This method is called before a test is executed.
+     */
+    public function setUp()
+    {
+        parent::setUp();
+    }
+
+    /**
+     * This method is called before the first test of this test class is run.
+     *
+     * @since Method available since Release 3.4.0
+     */
+    public static function setUpBeforeClass()
+    {
+        parent::setUpBeforeClass();
+    }
+
+    /**
+     * Tears down the fixture, for example, closes a network connection.
+     * This method is called after a test is executed.
+     */
+    public function tearDown()
+    {
+        parent::tearDown();
+
+    }
+
+    public function testCreate()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+
+        $this->call('GET', '/currency/create');
+        $this->assertResponseOk();
+        $this->assertViewHas('subTitle', 'Create a new currency');
+        $this->assertViewHas('subTitleIcon', 'fa-plus');
+
+    }
+
+    public function testDefaultCurrency()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $this->call('GET', '/currency/default/' . $currency->id);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success', $currency->name . ' is now the default currency.');
+    }
+
+    public function testDelete()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('countJournals')->andReturn(0);
+
+        $this->call('GET', '/currency/delete/' . $currency->id);
+        $this->assertResponseOk();
+        $this->assertViewHas('currency');
+
+    }
+
+    public function testDeleteUnable()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('countJournals')->andReturn(1);
+
+        $this->call('GET', '/currency/delete/' . $currency->id);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('error');
+
+    }
+
+    public function testDestroy()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('countJournals')->andReturn(0);
+
+        $this->call('POST', '/currency/destroy/' . $currency->id, ['_token' => 'replaceMe']);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success', 'Currency "' . e($currency->name) . '" deleted');
+
+    }
+
+    public function testDestroyUnable()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('countJournals')->andReturn(1);
+
+        $this->call('POST', '/currency/destroy/' . $currency->id, ['_token' => 'replaceMe']);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('error');
+
+    }
+
+    public function testEdit()
+    {
+        $user = FactoryMuffin::create('FireflyIII\User');
+        $this->be($user);
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('countJournals')->andReturn(0);
+
+        $this->call('GET', '/currency/edit/' . $currency->id);
+        $this->assertResponseOk();
+        $this->assertViewHas('currency');
+    }
+
+    public function testIndex()
+    {
+        $user     = FactoryMuffin::create('FireflyIII\User');
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+        $this->be($user);
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $repository->shouldReceive('get')->andReturn(new Collection);
+        $repository->shouldReceive('getCurrencyByPreference')->andReturn($currency);
+
+        $this->call('GET', '/currency');
+        $this->assertResponseOk();
+    }
+
+    public function testStore()
+    {
+        $user     = FactoryMuffin::create('FireflyIII\User');
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+        $this->be($user);
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $request    = $this->mock('FireflyIII\Http\Requests\CurrencyFormRequest');
+        $request->shouldReceive('getCurrencyData')->andReturn([]);
+        $repository->shouldReceive('store')->andReturn($currency);
+
+        $this->call('POST', '/currency/store', ['_token' => 'replaceMe']);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success');
+
+
+    }
+
+    public function testStoreAndReturn()
+    {
+        $user     = FactoryMuffin::create('FireflyIII\User');
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+        $this->be($user);
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $request    = $this->mock('FireflyIII\Http\Requests\CurrencyFormRequest');
+        $request->shouldReceive('getCurrencyData')->andReturn([]);
+        $repository->shouldReceive('store')->andReturn($currency);
+
+        $this->call('POST', '/currency/store', ['_token' => 'replaceMe', 'create_another' => 1]);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success');
+
+
+    }
+
+    public function testUpdate()
+    {
+        $user     = FactoryMuffin::create('FireflyIII\User');
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+        $this->be($user);
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $request    = $this->mock('FireflyIII\Http\Requests\CurrencyFormRequest');
+        $request->shouldReceive('getCurrencyData')->andReturn([]);
+        $repository->shouldReceive('update')->andReturn($currency);
+
+        $this->call('POST', '/currency/update/' . $currency->id, ['_token' => 'replaceMe']);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success');
+    }
+
+    public function testUpdateAndReturn()
+    {
+        $user     = FactoryMuffin::create('FireflyIII\User');
+        $currency = FactoryMuffin::create('FireflyIII\Models\TransactionCurrency');
+        $this->be($user);
+
+        $repository = $this->mock('FireflyIII\Repositories\Currency\CurrencyRepositoryInterface');
+        $request    = $this->mock('FireflyIII\Http\Requests\CurrencyFormRequest');
+        $request->shouldReceive('getCurrencyData')->andReturn([]);
+        $repository->shouldReceive('update')->andReturn($currency);
+
+        $this->call('POST', '/currency/update/' . $currency->id, ['_token' => 'replaceMe', 'return_to_edit' => 1]);
+        $this->assertResponseStatus(302);
+        $this->assertSessionHas('success');
+    }
+}
\ No newline at end of file