Minor refactor for insertion tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.79%. Comparing base (52a92fa) to head (c139917). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #324 +/- ## ======================================= Coverage 89.79% 89.79% ======================================= Files 37 37 Lines 2293 2293 ======================================= Hits 2059 2059 Misses 234 234 ```

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