test: add test for storePreviousURL in case of non-HTML response

tests/system/CodeIgniterTest.php

@@ -424,6 +424,30 @@ public function testNotStoresPreviousURL()
  $this->assertArrayNotHasKey('_ci_previous_url', $_SESSION);
  }
 
+ public function testNotStoresPreviousURLByCheckingContentType()
+ {
+ $_SERVER['argv'] = ['index.php', 'image'];
+ $_SERVER['argc'] = 2;
+
+ $_SERVER['REQUEST_URI'] = '/image';
+
+ // Inject mock router.
+ $routes = Services::routes();
+ $routes->add('image', static function () {
+ $response = Services::response();
+
+ return $response->setContentType('image/jpeg', '');
+ });
+ $router = Services::router($routes, Services::request());
+ Services::injectMock('router', $router);
+
+ ob_start();
+ $this->codeigniter->useSafeOutput(true)->run();
+ ob_get_clean();
+
+ $this->assertArrayNotHasKey('_ci_previous_url', $_SESSION);
+ }
+
  /**
  * The method after all test, reset Servces:: config
  * Can't use static::tearDownAfterClass. This will cause a buffer exception