Create a custom Exception when Coverage driver can’t be found.

Author: shulard

spec/Exception/NoCoverageDriverAvailableExceptionSpec.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace spec\LeanPHP\PhpSpec\CodeCoverage\Exception;
+
+use PhpSpec\ObjectBehavior;
+use LeanPHP\PhpSpec\CodeCoverage\Exception\NoCoverageDriverAvailableException;
+
+/**
+ * @author Stéphane Hulard
+ */
+class NoCoverageDriverAvailableExceptionSpec extends ObjectBehavior
+{
+    function it_is_initializable()
+    {
+        $this->shouldBeAnInstanceOf(\RuntimeException::class);
+        $this->shouldHaveType(NoCoverageDriverAvailableException::class);
+    }
+}

src/CodeCoverageExtension.php

@@ -20,6 +20,7 @@
 use SebastianBergmann\CodeCoverage\Report;
 use SebastianBergmann\CodeCoverage\Version;
 use Symfony\Component\Console\Input\InputOption;
+use LeanPHP\PhpSpec\CodeCoverage\Exception\NoCoverageDriverAvailableException;
 
 /**
  * Injects Code Coverage Event Subscriber into the EventDispatcher.
@@ -43,7 +44,17 @@ public function load(ServiceContainer $container, array $params = [])
         });
 
         $container->define('code_coverage', function ($container) {
-            return new CodeCoverage(null, $container->get('code_coverage.filter'));
+            try {
+                $coverage = new CodeCoverage(null, $container->get('code_coverage.filter'));
+            } catch (\RuntimeException $error) {
+                throw new NoCoverageDriverAvailableException(
+                    "There is no available coverage driver to be used.",
+                    0,
+                    $error
+                );
+            }
+
+            return $coverage;
         });
 
         $container->define('code_coverage.options', function ($container) use ($params) {

src/Exception/NoCoverageDriverAvailableException.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * This file is part of the leanphp/phpspec-code-coverage package
+ *
+ * @author shulard <s.hulard@chstudio.fr>
+ *
+ * @license MIT
+ *
+ * For the full copyright and license information, please see the LICENSE file
+ * that was distributed with this source code.
+ *
+ */
+namespace LeanPHP\PhpSpec\CodeCoverage\Exception;
+
+use \RuntimeException;
+
+/**
+ * When PHPUnit/CodeCoverage trigger an exception which says that's no driver
+ * can be found, we catch it to decorate with our own.
+ *
+ * @author Stéphane Hulard
+ */
+class NoCoverageDriverAvailableException extends RuntimeException
+{
+}