Keep in mind that mobile friendly test is only testing that particular page. So if you put your homepage in the test to analyze, it is only scanning that particular page, not the entire website. So there could be internal pages that do not pass the test.
This is where using the Google Webmaster Mobile Usability Tool is critical to determining any errors Google might have with your website.
• How can I make sure my site does not get negatively impacted by the Google mobile friendly update on 21/04/2015
• I did the Google Mobile Friendly test and it said “Awesome! This page is mobile-friendly.” Does that mean my website will be OK after this update?
• I already have a responsive website, or standalone mobile website, do I need to worry about the Google mobile friendly update of 21/04/2015?