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## ----setup, include = FALSE---------------------------------------------------
library(testthat)
knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
## -----------------------------------------------------------------------------
expect_length <- function(object, n) {
# 1. Capture object and label
act <- quasi_label(rlang::enquo(object), arg = "object")
# 2. Call expect()
act$n <- length(act$val)
expect(
act$n == n,
sprintf("%s has length %i, not length %i.", act$lab, act$n, n)
)
# 3. Invisibly return the value
invisible(act$val)
}
## -----------------------------------------------------------------------------
mtcars %>%
expect_type("list") %>%
expect_s3_class("data.frame") %>%
expect_length(11)
## -----------------------------------------------------------------------------
expect_length <- function(object, n) {
act <- quasi_label(rlang::enquo(object), arg = "object")
act$n <- length(act$val)
if (act$n == n) {
succeed()
return(invisible(act$val))
}
message <- sprintf("%s has length %i, not length %i.", act$lab, act$n, n)
fail(message)
}
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