[R-pkg-devel] Testing for a Specific R Error

[Henrik Bengtsson]

For the translation part, you can test the received error message against
the translated message. You can get the translated version from the
original one using gettext("<non-translated error message exactly as the
original code does it>").

This should be agile to user's language settings but, of course, not to
changes that the developer does to the the error message.

Henrik

On Dec 2, 2017 05:38, "Bill Denney" <bill at denney.ws> wrote:

Hi,

I got a message last night that some of the tests in the PKNCA package do
not follow best practices.  ("Do not test the exact format of R messages
(from R itself or from other packages): They change, and they can be
translated.")  Specifically, I test to ensure that an error is generated
when a class cannot be coerced into a data.frame:
https://cran.r-project.org/web/checks/check_results_PKNCA.html

I want to ensure that I'm getting an error that the variable cannot be
coerced into a data.frame.

What is the best practice to ensure that I'm getting a specific R error
(about coercion) without testing the formatting of the error text?

The only solution that immediately occurs to me is to wrap the coercion in
a tryCatch and give my own error.  But, then were the R error translated,
the users of my package would lose the benefit of translation.

Thanks,

Bill

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