検査（の件数）が増加する

testing increases
フレーズ、S+Vの構造

As of Sunday Brazil had officially confirmed 4,256 cases and 136 Covid-19 deaths - the majority in Rio (17) and São Paulo (98). Those numbers are expected to rise significantly in the coming days as testing increases and the virus spreads. Brazil’s health ministry has warned the hospital system could collapse by the end of April.
https://www.theguardian.com/world/live/2020/mar/30...