Add infos to check for failing test on gitlab

tests/application/modules/opac/controllers/FormulaireContactTest.php

@@ -137,7 +137,9 @@ class FormulaireContactInvalidCaptchaPostTest extends AbstractControllerTestCase
 
 	/** @test */
 	public function errorShouldContainsWrongCaptcha() {
-		$this->assertXPathContentContains('//ul[@class="errors"]', "captcha");
+		$this->assertXPathContentContains('//ul[@class="errors"]', 
+																			"captcha",
+																			$this->_response->getBody());
 	}
 }