[Feature Request]: Code coverage above 80%

[llrs-roche]

Feature description

To release we will need to have code coverage above 80%.
Currently on main we are very close at 79%:

teal.picks Coverage: 79.49%
R/0-badge_dropdown.R: 0.00%
R/0-tidyselect-helpers.R: 0.00%
R/0-tm_merge.R: 0.00%
R/zzz.R: 0.00%
R/0-as_picks.R: 40.46%
R/0-call_utils.R: 80.00%
R/0-module_picks.R: 87.92%
R/0-print.R: 94.74%
R/0-picks.R: 99.36%
R/0-module_merge.R: 99.50%
R/0-resolver.R: 100.00%
R/assertion.R: 100.00%

The main code to test is the tm_merge module, tidyselect helpers and as.picks() (dropdown is an internal function that shouldn't be tested directly).

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