Fix error template in WhoopsRenderer

Ref : #886

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Prevent setup to run again if already configured when using `bake`
 - Fix `Unique::getPaginatedQuery` to call to `addSelect` instead of `select` during the pre-paginated query
 - Updated Spanish Translation (Thanks @silvioq !)
+- Fix error template in WhoopsRenderer (#885; Thanks @silvioq !)
 
 ## v4.1.18
 - Bakery setup wizard for SMTP config + separate SMTP setup in it's own command (https://github.com/userfrosting/UserFrosting/issues/874)

app/sprinkles/core/src/Error/Renderer/WhoopsRenderer.php

@@ -250,6 +250,7 @@ public function render()
             "has_frames"     => !!count($frames),
             "handler"        => $this,
             "handlers"       => [$this],
+            "prettify"       => true,
 
             "active_frames_tab" => count($frames) && $frames->offsetGet(0)->isApplication() ?  'application' : 'all',
             "has_frames_tabs"   => $this->getApplicationPaths(),

app/sprinkles/core/tests/Integration/Error/Renderer/WhoopsRendererTest.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace UserFrosting\Tests\Integration\Error\Renderer;
+
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use UserFrosting\Sprinkle\Core\Error\Renderer\WhoopsRenderer;
+use UserFrosting\Tests\TestCase;
+
+class WhoopsRendererTest extends TestCase
+{
+    public function testRenderWhoopsPage()
+    {
+        $request = $this->getMockBuilder(ServerRequestInterface::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $response = $this->getMockBuilder(ResponseInterface::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $exception = new \RuntimeException('This is my exception');
+
+        $whoopsRenderer = new WhoopsRenderer($request, $response, $exception, true);
+
+        // Avoid handle cli SAPI
+        $whoopsRenderer->handleUnconditionally(true);
+
+        $renderBody = $whoopsRenderer->render();
+        $this->assertTrue(!!preg_match('/RuntimeException: This is my exception in file /', $renderBody));
+        $this->assertTrue(!!preg_match('/<span>This is my exception<\/span>/', $renderBody));
+    }
+}