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## -----------------------------------------------------------------------------
library(testthat)
knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
# Pretend we're snapshotting
snapper <- local_snapshotter(fail_on_new = FALSE)
snapper$start_file("snapshotting.Rmd", "test")
# Pretend we're testing testthat so we can use mocking
Sys.setenv(TESTTHAT_PKG = "testthat")
## -----------------------------------------------------------------------------
check_installed <- function(pkg, min_version = NULL) {
if (!requireNamespace(pkg, quietly = TRUE)) {
stop(sprintf("{%s} is not installed.", pkg))
}
if (!is.null(min_version)) {
pkg_version <- packageVersion(pkg)
if (pkg_version < min_version) {
stop(sprintf(
"{%s} version %s is installed, but %s is required.",
pkg,
pkg_version,
min_version
))
}
}
invisible()
}
## -----------------------------------------------------------------------------
test_that("check_installed() checks package is installed", {
expect_no_error(check_installed("testthat"))
expect_snapshot(check_installed("doesntexist"), error = TRUE)
})
## -----------------------------------------------------------------------------
test_that("check_installed() checks minimum version", {
expect_no_error(check_installed("testthat", "1.0.0"))
expect_snapshot(check_installed("testthat", "99.99.999"), error = TRUE)
})
## -----------------------------------------------------------------------------
test_that("check_installed() checks minimum version", {
expect_no_error(check_installed("testthat", "1.0.0"))
expect_snapshot(
check_installed("testthat", "99.99.999"),
error = TRUE,
transform = function(lines) gsub(packageVersion("testthat"), "<version>", lines)
)
})
## -----------------------------------------------------------------------------
requireNamespace <- NULL
packageVersion <- NULL
## -----------------------------------------------------------------------------
test_that("check_installed() checks package is installed", {
local_mocked_bindings(requireNamespace = function(...) TRUE)
expect_no_error(check_installed("package-name"))
local_mocked_bindings(requireNamespace = function(...) FALSE)
expect_snapshot(check_installed("package-name"), error = TRUE)
})
## -----------------------------------------------------------------------------
test_that("check_installed() checks minimum version", {
local_mocked_bindings(
requireNamespace = function(...) TRUE,
packageVersion = function(...) numeric_version("2.0.0")
)
expect_no_error(check_installed("package-name", "1.0.0"))
expect_snapshot(check_installed("package-name", "3.4.5"), error = TRUE)
})
## -----------------------------------------------------------------------------
system_os <- NULL
## -----------------------------------------------------------------------------
# test_that("can skip on multiple oses", {
# local_mocked_bindings(system_os = function() "windows")
#
# expect_skip(skip_on_os("windows"))
# expect_skip(skip_on_os(c("windows", "linux")))
# expect_no_skip(skip_on_os("linux"))
# })
## -----------------------------------------------------------------------------
# local_mocked_bindings(
# get_revdeps = function() character(),
# gh_milestone_number = function(...) NA
# )
## -----------------------------------------------------------------------------
unix_time <- function() unclass(Sys.time())
unix_time()
## -----------------------------------------------------------------------------
elapsed <- function() {
start <- unix_time()
function() {
unix_time() - start
}
}
timer <- elapsed()
Sys.sleep(0.5)
timer()
## -----------------------------------------------------------------------------
test_that("elapsed() measures elapsed time", {
time <- 1
local_mocked_bindings(unix_time = function() time)
timer <- elapsed()
expect_equal(timer(), 0)
time <- 2
expect_equal(timer(), 1)
})
## -----------------------------------------------------------------------------
# old <- getFromNamespace("my_function", "mypackage")
# assignInNamespace("my_function", new, "mypackage")
#
# # run the test...
#
# # restore the previous value
# assignInNamespace("my_function", old, "mypackage")
|
