Many times the test returns and error. See: https://build.webkit.org/builders/GTK%20Linux%2064-bit%20Release%20%28Tests%29/builds/14372/steps/API%20tests/logs/stdio /webkit/WebKitWebsiteData/dom-cache: FAIL ERROR:../../Tools/TestWebKitAPI/Tests/WebKitGLib/TestWebsiteData.cpp:776:void testWebsiteDataDOMCache(WebsiteDataTest*, gconstpointer): 'dataList' should be nullptr