Throw an exception in the provider, if the file does not exist

src/Amara/Varcon/TranslationProvider.php

@@ -41,6 +41,10 @@ public function __construct($filePath = null, Util $util = null)
      */
     public function getTranslations($from, $to, $threshold = 80)
     {
+        if (!file_exists($this->filePath)) {
+            throw new \RuntimeException(sprintf('File not found: %s', $this->filePath));
+        }
+
         $fileHandle = fopen($this->filePath, 'r');
 
         $trans = [];

tests/Amara/Varcon/TranslationProviderTest.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Amara\Varcon;
+
+use PHPUnit_Framework_TestCase;
+
+class TranslationProviderTest extends PHPUnit_Framework_TestCase
+{
+    public function testGetTranslationsFileNotFoundException()
+    {
+        $translationProvider = new TranslationProvider('random-name-2439857.txt');
+
+        $this->setExpectedException(\RuntimeException::class, 'File not found: ');
+        $translationProvider->getTranslations('B', 'A');
+    }
+}