quasi_label {testthat} | R Documentation |
The first argument to every expect_
function can use unquoting to
construct better labels. This makes it easy to create informative labels
expectations are used inside a function or a for loop. quasi_label()
wraps
up the details, returning the expression and label.
quasi_label(quo, label = NULL)
quo |
A quosure created by |
label |
An optional label to override the default. This is
only provided for internal usage. Modern expectations should not
include a |
A list containing two elements:
val |
The evaluate value of |
lab |
The quasiquoted label generated from |
f <- function(i) if (i > 3) i * 9 else i * 10 i <- 10 # This short of expression commonly occurs inside a for loop or function # And the failure isn't helpful because you can't see the value of i # that caused the problem: show_failure(expect_equal(f(i), i * 10)) # To overcome this issue, testthat allows you to unquote expressions using # !!. This causes the failure message to show the value rather than the # variable name show_failure(expect_equal(f(!!i), !!(i * 10)))