diff --git a/apps/testing/composer/composer/autoload_classmap.php b/apps/testing/composer/composer/autoload_classmap.php
index 9be96aaf61793..81abc4acfe495 100644
--- a/apps/testing/composer/composer/autoload_classmap.php
+++ b/apps/testing/composer/composer/autoload_classmap.php
@@ -26,6 +26,7 @@
     'OCA\\Testing\\Settings\\DeclarativeSettingsForm' => $baseDir . '/../lib/Settings/DeclarativeSettingsForm.php',
     'OCA\\Testing\\TaskProcessing\\FakeContextWriteProvider' => $baseDir . '/../lib/TaskProcessing/FakeContextWriteProvider.php',
     'OCA\\Testing\\TaskProcessing\\FakeTextToImageProvider' => $baseDir . '/../lib/TaskProcessing/FakeTextToImageProvider.php',
+    'OCA\\Testing\\TaskProcessing\\FakeTextToTextChatProvider' => $baseDir . '/../lib/TaskProcessing/FakeTextToTextChatProvider.php',
     'OCA\\Testing\\TaskProcessing\\FakeTextToTextProvider' => $baseDir . '/../lib/TaskProcessing/FakeTextToTextProvider.php',
     'OCA\\Testing\\TaskProcessing\\FakeTextToTextSummaryProvider' => $baseDir . '/../lib/TaskProcessing/FakeTextToTextSummaryProvider.php',
     'OCA\\Testing\\TaskProcessing\\FakeTranscribeProvider' => $baseDir . '/../lib/TaskProcessing/FakeTranscribeProvider.php',
diff --git a/apps/testing/composer/composer/autoload_static.php b/apps/testing/composer/composer/autoload_static.php
index bd557c37f6bd1..94b58f35303e8 100644
--- a/apps/testing/composer/composer/autoload_static.php
+++ b/apps/testing/composer/composer/autoload_static.php
@@ -41,6 +41,7 @@ class ComposerStaticInitTesting
         'OCA\\Testing\\Settings\\DeclarativeSettingsForm' => __DIR__ . '/..' . '/../lib/Settings/DeclarativeSettingsForm.php',
         'OCA\\Testing\\TaskProcessing\\FakeContextWriteProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeContextWriteProvider.php',
         'OCA\\Testing\\TaskProcessing\\FakeTextToImageProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeTextToImageProvider.php',
+        'OCA\\Testing\\TaskProcessing\\FakeTextToTextChatProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeTextToTextChatProvider.php',
         'OCA\\Testing\\TaskProcessing\\FakeTextToTextProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeTextToTextProvider.php',
         'OCA\\Testing\\TaskProcessing\\FakeTextToTextSummaryProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeTextToTextSummaryProvider.php',
         'OCA\\Testing\\TaskProcessing\\FakeTranscribeProvider' => __DIR__ . '/..' . '/../lib/TaskProcessing/FakeTranscribeProvider.php',
diff --git a/apps/testing/lib/AppInfo/Application.php b/apps/testing/lib/AppInfo/Application.php
index 2add318f32746..db68795ced86e 100644
--- a/apps/testing/lib/AppInfo/Application.php
+++ b/apps/testing/lib/AppInfo/Application.php
@@ -20,6 +20,7 @@
 use OCA\Testing\Settings\DeclarativeSettingsForm;
 use OCA\Testing\TaskProcessing\FakeContextWriteProvider;
 use OCA\Testing\TaskProcessing\FakeTextToImageProvider;
+use OCA\Testing\TaskProcessing\FakeTextToTextChatProvider;
 use OCA\Testing\TaskProcessing\FakeTextToTextProvider;
 use OCA\Testing\TaskProcessing\FakeTextToTextSummaryProvider;
 use OCA\Testing\TaskProcessing\FakeTranscribeProvider;
@@ -47,6 +48,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerTextToImageProvider(FakeText2ImageProvider::class);
 
 		$context->registerTaskProcessingProvider(FakeTextToTextProvider::class);
+		$context->registerTaskProcessingProvider(FakeTextToTextChatProvider::class);
 		$context->registerTaskProcessingProvider(FakeTextToTextSummaryProvider::class);
 		$context->registerTaskProcessingProvider(FakeTextToImageProvider::class);
 		$context->registerTaskProcessingProvider(FakeTranslateProvider::class);
diff --git a/apps/testing/lib/TaskProcessing/FakeTextToTextChatProvider.php b/apps/testing/lib/TaskProcessing/FakeTextToTextChatProvider.php
new file mode 100644
index 0000000000000..8f75490dd6c8a
--- /dev/null
+++ b/apps/testing/lib/TaskProcessing/FakeTextToTextChatProvider.php
@@ -0,0 +1,98 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+declare(strict_types=1);
+
+namespace OCA\Testing\TaskProcessing;
+
+use OCA\Testing\AppInfo\Application;
+use OCP\AppFramework\Services\IAppConfig;
+use OCP\TaskProcessing\Exception\ProcessingException;
+use OCP\TaskProcessing\ISynchronousProvider;
+use OCP\TaskProcessing\TaskTypes\TextToTextChat;
+use RuntimeException;
+
+class FakeTextToTextChatProvider implements ISynchronousProvider {
+
+	public function __construct(
+		protected IAppConfig $appConfig,
+	) {
+	}
+
+	public function getId(): string {
+		return Application::APP_ID . '-text2textchat';
+	}
+
+	public function getName(): string {
+		return 'Fake text2text chat task processing provider';
+	}
+
+	public function getTaskTypeId(): string {
+		return TextToTextChat::ID;
+	}
+
+	public function getExpectedRuntime(): int {
+		return 1;
+	}
+
+	public function getInputShapeEnumValues(): array {
+		return [];
+	}
+
+	public function getInputShapeDefaults(): array {
+		return [];
+	}
+
+	public function getOptionalInputShape(): array {
+		return [];
+	}
+
+	public function getOptionalInputShapeEnumValues(): array {
+		return [];
+	}
+
+	public function getOptionalInputShapeDefaults(): array {
+		return [];
+	}
+
+	public function getOptionalOutputShape(): array {
+		return [];
+	}
+
+	public function getOutputShapeEnumValues(): array {
+		return [];
+	}
+
+	public function getOptionalOutputShapeEnumValues(): array {
+		return [];
+	}
+
+	public function process(?string $userId, array $input, callable $reportProgress): array {
+		if ($this->appConfig->getAppValueBool('fail-' . $this->getId())) {
+			throw new ProcessingException('Failing as set by AppConfig');
+		}
+
+		if (!isset($input['system_prompt']) || !is_string($input['system_prompt'])) {
+			throw new RuntimeException('Invalid system prompt');
+		}
+
+		if (!isset($input['input']) || !is_string($input['input'])) {
+			throw new RuntimeException('Invalid input message');
+		}
+
+		if (!isset($input['history']) || !is_array($input['history'])) {
+			throw new RuntimeException('Invalid message history');
+		}
+
+		return [
+			'output' => 'This is a fake response message: '
+				. "\n\n- System prompt: " . $input['system_prompt']
+				. "\n- Input message: " . $input['input']
+				. "\n- Message history:\n" . count($input['history']) . ' messages',
+		];
+	}
+}