context("Evaluation")
test_that("file with only comments runs", {
ev <- evaluate(file("comment.r"))
expect_that(length(ev), equals(2))
expect_that(classes(ev), equals(c("source", "source")))
})
test_that("data sets loaded", {
ev <- evaluate(file("data.r"))
if (require("lattice", quietly = TRUE)) expect_that(length(ev), equals(3))
})
# # Don't know how to implement this
# test_that("newlines escaped correctly", {
# ev <- evaluate("cat('foo\n')")
# expect_that(ev[[1]]$src, equals("cat('foo\\n'))"))
# })
test_that("terminal newline not needed", {
ev <- evaluate("cat('foo')")
expect_that(length(ev), equals(2))
expect_that(ev[[2]], equals("foo"))
})
test_that("S4 methods are displayed with show, not print", {
setClass("A", contains = "function", where = environment())
setMethod("show", "A", function(object) cat("B"))
a <- new('A', function() b)
ev <- evaluate("a")
expect_equal(ev[[2]], "B")
})
test_that("errors during printing visible values are captured", {
setClass("A", contains = "function", where = environment())
setMethod("show", "A", function(object) stop("B"))
a <- new('A', function() b)
ev <- evaluate("a")
stopifnot("error" %in% class(ev[[2]]))
})
test_that("options(warn = -1) suppresses warnings", {
ev <- evaluate("op = options(warn = -1); warning('hi'); options(op)")
expect_that(classes(ev), equals("source"))
})
test_that("options(warn = 0) and options(warn = 1) produces warnings", {
ev <- evaluate("op = options(warn = 0); warning('hi'); options(op)")
expect_equal(classes(ev), c("source", "simpleWarning"))
ev <- evaluate("op = options(warn = 1); warning('hi'); options(op)")
expect_equal(classes(ev), c("source", "simpleWarning"))
})
# See https://github.com/r-lib/evaluate/pull/81#issuecomment-367685196
# test_that("options(warn = 2) produces errors instead of warnings", {
# ev_warn_2 <- evaluate("op = options(warn = 2); warning('hi'); options(op)")
# expect_equal(classes(ev_warn_2), c("source", "simpleError"))
# })
test_that("output and plots interleaved correctly", {
ev <- evaluate(file("interleave-1.r"))
expect_equal(classes(ev),
c("source", "character", "recordedplot", "character", "recordedplot"))
ev <- evaluate(file("interleave-2.r"))
expect_equal(classes(ev),
c("source", "recordedplot", "character", "recordedplot", "character"))
})
test_that("return value of value handler inserted directly in output list", {
ev <- evaluate(file("raw-output.r"), output_handler = new_output_handler(value = identity))
if (require("ggplot2", quietly = TRUE)) {
expect_equal(classes(ev),
c("source", "numeric", "source", "source", "source", "gg"))
}
})
test_that("invisible values can also be saved if value handler has two arguments", {
handler <- new_output_handler(value = function(x, visible) {
x # always returns a visible value
})
ev <- evaluate("x<-1:10", output_handler = handler)
expect_equal(classes(ev), c("source", "integer"))
})
test_that("multiple expressions on one line can get printed as expected", {
ev <- evaluate("x <- 1; y <- 2; x; y")
expect_equal(classes(ev), c("source", "character", "character"))
})
test_that("multiple lines of comments do not lose the terminating \\n", {
ev <- evaluate("# foo\n#bar")
expect_equal(ev[[1]][["src"]], "# foo\n")
})
test_that("user can register calling handlers", {
cnd <- structure(list(), class = c("foobar", "condition"))
hnd <- function(cnd) handled <<- cnd
handled <- NULL
hnd <- function(cnd) handled <<- cnd
out_hnd <- new_output_handler(calling_handlers = list(foobar = hnd))
evaluate("signalCondition(cnd)", output_handler = out_hnd)
expect_s3_class(handled, "foobar")
handled <- NULL
out_hnd <- new_output_handler(calling_handlers = list(error = hnd))
evaluate("stop('tilt')", stop_on_error = 0, output_handler = out_hnd)
expect_s3_class(handled, "error")
})
test_that("calling handlers are checked", {
expect_error(
new_output_handler(calling_handlers = list(condition = 1)),
"must be"
)
expect_error(
new_output_handler(calling_handlers = list(function(...) NULL)),
"must be"
)
expect_error(
new_output_handler(calling_handlers = stats::setNames(list(function(...) NULL), NA)),
"must be"
)
expect_error(
new_output_handler(calling_handlers = stats::setNames(list(function(...) NULL), "")),
"must be"
)
})
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