Countries testing do not fluctuate over long periods of time, there might be daily drops here and there but number of testing in countries are consistent. Reported number of cases are very important on their own regardless.Useless without a comparison of the number of tests per day.
Sweden's testing as always been horrendous as they did not believe in preventive measures, up to a couple of weeks ago they were only testing 20k/day on average, only in the last 2 weeks have they finally been able to increase to 30k/day on average, it's even worse when comparing testing/Million to their immediate bordering neighbours Denmark, Finland, and Norway.
Sweden--------313,539/Mln
Finland---------355,564/Mln
Norway--------421,888/Mln
Denmark------1,306,021/Mln
Testing is one of the reasons why there is such a large disparity between the number of cases/Mln, and deaths/Mln in those countries in comparison to Sweden as Sweden from the beginning had a lack of testing issue and lack of preventive measures issue.
Sweden: weekly tested coronavirus 2020 | Statista
The weekly number of people tested for the coronavirus (COVID-19) in Sweden overall increased during the period.
www.statista.com