Closes #2377 Added unit tests

[StefanThoma]

Added assertion to dt_level function to deal with unexpected inputs

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[StefanThoma]

I get a strange error in the test suite apparently independent of my code:

Error in derive_param_tte(): ! For some values of "PARAMCD" there is more than one value of "AEDECOD" ℹ Call get_one_to_many_dataset() to get all one-to-many values.

Where the test expects the error as: regexp = paste0( "For some values of PARAMCD there is more than one value of AEDECOD.\n", "Call get_one_to_many_dataset() to get all one to many values." )

I can replace this with a snapshot test, maybe!

[StefanThoma]

There appears also a deprecation warning:

Warning ('test-derive_param_tte.R:45:3'): derive_param_tte Test 1: new observations with analysis date are derived correctly ── enumerate() was deprecated in admiraldev 1.1.0.

[github-actions[bot]]

Package	Line Rate	Health
admiral	98%	✔
Summary	98% (4732 / 4820)	✔

[bundfussr]

There appears also a deprecation warning:

Warning ('test-derive_param_tte.R:45:3'): derive_param_tte Test 1: new observations with analysis date are derived correctly ── enumerate() was deprecated in admiraldev 1.1.0.

I'm currently trying to fix these in https://github.com/pharmaverse/admiral/issues/2413.

[StefanThoma]

@zdz2101 I have added an assert statement into dt_level. I believe this is consistent with what input we would expect, i.e. a character scalar of one of the options. Can you confirm?