has_name now always returns a single logical value #60
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jameslamb
commented
Mar 20, 2019
| on_failure(has_name) <- function(call, env) { | ||
| paste0(deparse(call$x), " does not have name ", eval(call$which, env)) | ||
| out_names <- paste0("'", paste0(eval(call$which, env), collapse = "', '"), "'") | ||
| paste0(deparse(call$x), " does not have all of these name(s): ", out_names) |
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because of the possibility that call$which is a vector with length greater than 1, I had to do this paste0() stuff to avoid getting
Error in stop(assertError(attr(res, "msg"))) : bad error message
jameslamb
commented
Mar 20, 2019
| has_args <- function(f, args, exact = FALSE) { | ||
| assert_that(is.function(f)) | ||
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Sorry, I have my RStudio set to trim trailing whitespace when I save a file. Let me know if you'd like me to revert all of these
jameslamb
commented
Mar 20, 2019
| ) | ||
| }) | ||
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| test_that("assert_that handles has_name failures with multiple missing names", { |
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added this test to catch the condition I mentioned above, where failures with a call$which that has length > 1 could produce a bad error message
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Thanks! |
jameslamb
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Per discussion in #59 . In #46 I made
has_name()throw an error if you tried to check multiple names in one call, e.g.Four packages on CRAN have code (covered by tests) that uses
has_name()with multiple names, and all of them do this:Instead of breaking their code, I think the spirit of #46 (all assertions return exactly one
TRUE/FALSE) can still be accomplished by using anall()insidehas_name()! That is what I've proposed in this PR.