Checking formula input

[athowes]

I think that epidist_formula should pass tests of this form. It currently doesn't.

test_that("epidist_formula.epidist_latent_individual with custom formulas errors for incorrect custom formulas", { # nolint: line_length_linter.
  expect_error(epidist_formula(prep_obs, delay_central = ~ 1 + age))
  expect_error(epidist_formula(prep_obs, sigma = ~ 1 + age))
  expect_error(epidist_formula(prep_obs, delay_central = 1))
  expect_error(epidist_formula(prep_obs, sigma = 1))
})

I propose to add the following to epidist_formula:

1. Checking that the variables included in all formulas are available in the data
2. Checking that the formulas provided are in an appropriate form

I am interested in steers on the best way to do 1. and 2.

For 2. I am interested what range of formulas we should accept. For example should we accept strings?

Resources

• Use checkmate for argument checking #45