Added Twig assertions

src/Codeception/Module/Symfony.php

@@ -23,6 +23,7 @@
 use Codeception\Module\Symfony\SecurityAssertionsTrait;
 use Codeception\Module\Symfony\ServicesAssertionsTrait;
 use Codeception\Module\Symfony\SessionAssertionsTrait;
+use Codeception\Module\Symfony\TwigAssertionsTrait;
 use Codeception\TestInterface;
 use Exception;
 use ReflectionClass;
@@ -153,7 +154,8 @@ class Symfony extends Framework implements DoctrineProvider, PartedModule
         RouterAssertionsTrait,
         SecurityAssertionsTrait,
         ServicesAssertionsTrait,
-        SessionAssertionsTrait
+        SessionAssertionsTrait,
+        TwigAssertionsTrait
     ;
 
     private static $possibleKernelClasses = [

src/Codeception/Module/Symfony/TwigAssertionsTrait.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Codeception\Module\Symfony;
+
+use Symfony\Bridge\Twig\DataCollector\TwigDataCollector;
+
+trait TwigAssertionsTrait
+{
+    /**
+     * Asserts that a template was not rendered in the response.
+     *
+     * ```php
+     * <?php
+     * $I->dontSeeRenderedTemplate('home.html.twig');
+     * ```
+     *
+     * @param string $template
+     */
+    public function dontSeeRenderedTemplate(string $template): void
+    {
+        $twigCollector = $this->grabTwigCollector(__FUNCTION__);
+
+        $templates = (array) $twigCollector->getTemplates();
+
+        $this->assertArrayNotHasKey(
+            $template,
+            $templates,
+            "Template {$template} was rendered."
+        );
+    }
+
+    /**
+     * Asserts that the current template matches the expected template.
+     *
+     * ```php
+     * <?php
+     * $I->seeCurrentTemplateIs('home.html.twig');
+     * ```
+     *
+     * @param string $expectedTemplate
+     */
+    public function seeCurrentTemplateIs(string $expectedTemplate): void
+    {
+        $twigCollector = $this->grabTwigCollector(__FUNCTION__);
+
+        $templates = (array) $twigCollector->getTemplates();
+        $actualTemplate = array_key_first($templates);
+
+        $this->assertEquals(
+            $expectedTemplate,
+            $actualTemplate,
+            "Actual template {$actualTemplate} does not match expected template {$expectedTemplate}."
+        );
+    }
+
+    /**
+     * Asserts that a template was rendered in the response.
+     * That includes templates built with [inheritance](https://twig.symfony.com/doc/3.x/templates.html#template-inheritance).
+     *
+     * ```php
+     * <?php
+     * $I->seeRenderedTemplate('home.html.twig');
+     * $I->seeRenderedTemplate('layout.html.twig');
+     * ```
+     *
+     * @param string $template
+     */
+    public function seeRenderedTemplate(string $template): void
+    {
+        $twigCollector = $this->grabTwigCollector(__FUNCTION__);
+
+        $templates = (array) $twigCollector->getTemplates();
+
+        $this->assertArrayHasKey(
+            $template,
+            $templates,
+            "Template {$template} was not rendered."
+        );
+    }
+
+    protected function grabTwigCollector(string $function): TwigDataCollector
+    {
+        return $this->grabCollector('twig', $function);
+    }
+}