United States dropping the requirement for a negative Covid test 24 hours prior to entering the country. See the article below.
Below are useful links from the Finnish Institute for Health and Welfare with current Covid-19 requirements and restrictions. Additionally, there is a link to local testing sites.
From this link ( by the Finnish Institute for health and welfare) you can read more about the entry requirements
as well as the Finnish Government pages: https://valtioneuvosto.fi/en/information-on-coronavirus/current-restrictions/travel-to-and-from-finland
You can find Covid testing places from this page
https://www.koronatestihinta.fi/en/finland/helsinki/ I can recommend PR2You Oy