Add init file in test dir

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3f7437f) 38.59% compared to head (08ce995) 38.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #66 +/- ## ======================================= Coverage 38.59% 38.59% ======================================= Files 12 12 Lines 710 710 ======================================= Hits 274 274 Misses 436 436 ``` | Flag | Coverage Δ | | |---|---|---| | pytest | `38.59% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=PnX-SI#carryforward-flags-in-the-pull-request-comment) to find out more.

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