As a trial; tentatively or experimentally—doing something once to see how it goes.
試しにそのアプリをダウンロードしてみた。
I downloaded that app to try it out.
味見がてら、ソースを試しに少しだけかけてみた。
As a taste test, I drizzled a little of the sauce.
家具の配置を変えて、試しにここにソファを置いてみよう。
Let's change the furniture arrangement and try placing the sofa here for a bit.
分からない単語は試しに辞書で調べてみるといい。
If you don't understand a word, it's good to look it up in the dictionary as a test.