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library(testthat)
## Helper functions to create a new package, with some
## R code, and install it temporarily
install_quietly <- TRUE
with_wd <- function(dir, expr) {
wd <- getwd()
on.exit(setwd(wd))
setwd(dir)
eval(substitute(expr), envir = parent.frame())
}
build_pkg <- function(path, pkg_file = NULL) {
if (!file.exists(path)) stop("path does not exist")
pkg_name <- basename(path)
if (is.null(pkg_file)) {
pkg_file <- file.path(dirname(path), paste0(pkg_name, "_1.0.tar.gz"))
}
with_wd(dirname(path),
tar(basename(pkg_file), pkg_name, compression = "gzip"))
pkg_file
}
install_tmp_pkg <- function(..., pkg_name, lib_dir, imports = "R6") {
if (!file.exists(lib_dir)) stop("lib_dir does not exist")
if (!is.character(pkg_name) || length(pkg_name) != 1) {
stop("pkg_name is not a string")
}
## Create a directory that will contain the source package
src_dir <- tempfile()
on.exit(try(unlink(src_dir, recursive = TRUE), silent = TRUE), add = TRUE)
dir.create(src_dir)
## Create source package, need a non-empty environment,
## otherwise package.skeleton fails
tmp_env <- new.env()
assign("f", function(x) x, envir = tmp_env)
suppressMessages(package.skeleton(pkg_name, path = src_dir,
envir = tmp_env))
pkg_dir <- file.path(src_dir, pkg_name)
## Make it installable: remove man, add R6 dependency
unlink(file.path(pkg_dir, "man"), recursive = TRUE)
cat("Imports: ", paste(imports, collapse = ", "), "\n",
file = file.path(pkg_dir, "DESCRIPTION"), append = TRUE)
cat(paste0("import(", imports, ")"), sep="\n",
file = file.path(pkg_dir, "NAMESPACE"), append = TRUE)
## Put the code in it, dput is noisy, so we need to redirect it to
## temporary file
exprs <- list(...)
unlink(file.path(pkg_dir, "R"), recursive = TRUE)
dir.create(file.path(pkg_dir, "R"))
code_file <- file.path(pkg_dir, "R", "code.R")
tmp_file <- tempfile()
on.exit(try(unlink(tmp_file), silent = TRUE), add = TRUE)
sapply(exprs, function(x)
cat(deparse(dput(x, file = tmp_file)),
file = code_file, append = TRUE, "\n", sep="\n"))
## Build it
pkg_file <- build_pkg(pkg_dir)
## Install it into the supplied lib_dir
install.packages(pkg_file, lib = lib_dir, repos = NULL, type = "source",
quiet = install_quietly)
}
with_libpath <- function(lib_path, ...) {
cur_lib_path <- .libPaths()
on.exit(.libPaths(cur_lib_path), add = TRUE)
.libPaths(c(lib_path, cur_lib_path))
exprs <- c(as.list(match.call(expand.dots = FALSE)$...))
sapply(exprs, eval, envir = parent.frame())
}
## Each expression in ... is put in a package, that
## is installed and loaded. The package name is given by
## argument name. The packages will be installed in lib_dir,
load_tmp_pkgs <- function(..., lib_dir = tempfile(), imports = "R6") {
if (!file.exists(lib_dir)) dir.create(lib_dir)
exprs <- c(as.list(match.call(expand.dots = FALSE)$...))
for (i in seq_along(exprs)) {
expr <- exprs[[i]]
name <- names(exprs)[i]
install_tmp_pkg(expr, pkg_name = name,
lib_dir = lib_dir, imports = imports)
## Unload everything if an error happens
on.exit(try(unloadNamespace(name), silent = TRUE), add = TRUE)
with_libpath(lib_dir, suppressMessages(library(name, quietly = TRUE,
character.only = TRUE)))
on.exit()
}
invisible(NULL)
}
test_that("inheritance works across packages", {
## Temporary lib_dir
lib_dir <- tempfile()
on.exit(try(unlink(lib_dir, recursive = TRUE), silent = TRUE),
add = TRUE)
on.exit(unloadNamespace("R6testB"), add = TRUE)
on.exit(unloadNamespace("R6testA"), add = TRUE)
## Make sure that we get the latest versions of them
try(unloadNamespace("R6testB"), silent = TRUE)
try(unloadNamespace("R6testA"), silent = TRUE)
load_tmp_pkgs(lib_dir = lib_dir,
## Code to put in package 'R6testA'
R6testA = {
AC <- R6Class(
public = list(
x = 1
)
)
},
## Code to put in package 'R6testB'
R6testB = {
BC <- R6Class(
inherit = R6testA::AC,
public = list(
y = 2
)
)
}
)
## Now ready for the tests
B <- BC$new()
expect_equal(B$x, 1)
expect_equal(B$y, 2)
})
test_that("more inheritance", {
## Temporary lib_dir
lib_dir <- tempfile()
on.exit(try(unlink(lib_dir, recursive = TRUE), silent = TRUE), add = TRUE)
on.exit(unloadNamespace("pkgB"), add = TRUE)
on.exit(unloadNamespace("pkgA"), add = TRUE)
## Make sure that we get the latest versions of them
try(unloadNamespace("pkgB"), silent = TRUE)
try(unloadNamespace("pkgA"), silent = TRUE)
load_tmp_pkgs(lib_dir = lib_dir,
pkgA = {
funA <- function() {
message("Called funA in pkgA 1.0")
}
AC <- R6Class("AC",
public = list(
versionString = "pkgA 1.0",
fun = function() {
message("This object was created in pkgA 1.0")
message(paste0("The object has versionString ",
self$versionString))
funA()
}
)
)
}
)
load_tmp_pkgs(lib_dir = lib_dir, imports = "pkgA",
pkgB = {
B <- pkgA::AC$new()
}
)
expect_message(B$fun(), "created in pkgA 1.0")
expect_message(B$fun(), "versionString pkgA 1.0")
expect_message(B$fun(), "Called funA in pkgA 1.0")
unloadNamespace("pkgB")
unloadNamespace("pkgA")
load_tmp_pkgs(lib_dir = lib_dir,
pkgA = {
funA <- function() {
message("Called funA in pkgA 2.0")
}
AC <- R6Class("AC",
public = list(
versionString = "pkgA 2.0",
fun = function() {
message("This object was created in pkgA 2.0")
message(paste0("The object has versionString ",
self$versionString))
funA()
}
)
)
}
)
with_libpath(lib_dir, library(pkgB))
expect_message(B$fun(), "created in pkgA 1.0")
expect_message(B$fun(), "versionString pkgA 1.0")
expect_message(B$fun(), "Called funA in pkgA 2.0")
})
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