Increase coverage

codecov.yml

@@ -0,0 +1,5 @@
+coverage:
+  status:
+    patch:
+      default:
+        target: 70%

test/ApplicationTest.php

@@ -6,6 +6,7 @@
 
 use PhpSchool\PhpWorkshop\Application;
 use PHPUnit\Framework\TestCase;
+use PhpSchool\PhpWorkshop\Exception\InvalidArgumentException;
 
 class ApplicationTest extends TestCase
 {
@@ -58,4 +59,30 @@ public function testEventListenersFromLocalAndWorkshopConfigAreMerged(): void
             $eventListeners
         );
     }
+
+    public function testExceptionIsThrownIfConfigFileDoesNotExist(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('File "not-existing-file.php" was expected to exist.');
+
+        new Application('My workshop', 'not-existing-file.php');
+    }
+
+    public function testExceptionIsThrownIfResultClassDoesNotExist(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Class "NotExistingClass" does not exist');
+
+        $app = new Application('My workshop', __DIR__ . '/../app/config.php');
+        $app->addResult(\NotExistingClass::class, \NotExistingClass::class);
+    }
+
+    public function testExceptionIsThrownIfResultRendererClassDoesNotExist(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Class "NotExistingClass" does not exist');
+
+        $app = new Application('My workshop', __DIR__ . '/../app/config.php');
+        $app->addResult(\PhpSchool\PhpWorkshop\Result\Success::class, \NotExistingClass::class);
+    }
 }