Ensure that the test file can be overwritten

[daniel-thom]

This test was failing when the package was installed by cloning a git branch, which causes all source files to be read-only. Copy/edit of the descriptor file in this test would then fail.

[codecov[bot]]

Codecov Report

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

Project coverage is 79.82%. Comparing base (d0533aa) to head (a9c32e6).

Additional details and impacted files

[](https://app.codecov.io/gh/NREL-Sienna/InfrastructureSystems.jl/pull/336?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna) ```diff @@ Coverage Diff @@ ## main #336 +/- ## ========================================== + Coverage 79.77% 79.82% +0.05% ========================================== Files 54 54 Lines 4341 4337 -4 ========================================== - Hits 3463 3462 -1 + Misses 878 875 -3 ``` | [Flag](https://app.codecov.io/gh/NREL-Sienna/InfrastructureSystems.jl/pull/336/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/NREL-Sienna/InfrastructureSystems.jl/pull/336/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna) | `79.82% <ø> (+0.05%)` | :arrow_up: | 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=NREL-Sienna#carryforward-flags-in-the-pull-request-comment) to find out more. [see 4 files with indirect coverage changes](https://app.codecov.io/gh/NREL-Sienna/InfrastructureSystems.jl/pull/336/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=NREL-Sienna)

[jd-lara]

should we port this to psy4 too?