Language R

Versions

3.4.1

Test Frameworks

testthat

Using Preloaded Code

Preloaded

f <- function(a, b) { a + b }

Solution

source("setup.R")
add <- f

Tests

test_that("addition using preloaded works", {
  expect_equal(add(1, 1), 2)
})

Timeout

12 seconds

Packages

Packages in the tidyverse are installed (v1.2.1).

Note that some packages requires suppressPackageStartupMessages or warn.conflicts=FALSE to avoid warnings printed to stderr causing failure (Codewars' limitation).

Example:

suppressPackageStartupMessages(
  library(dplyr)
)
# or
library(dplyr, warn.conflicts=FALSE)

For ggplot2, use SVGs or data URIs to show the image. Specify width and height when calling ggsave to avoid message written to stderr.

Example:

library(ggplot2)
# example plot
p <- ggplot(mpg, aes(displ, hwy, colour = class)) + 
  geom_point()

# SVG
svgf <- "/workspace/p.svg"
ggsave(plot=p, filename=svgf, width=7, height=7)
cat(sprintf('\n<LOG::Plot>%s\n', paste(readLines(svgf, encoding="UTF-8"), collapse="")))

# PNG
pngf <- "/workspace/p.png"
ggsave(plot=p, filename=pngf, width=7, height=7)
cat(sprintf('\n<LOG::Plot><img src="data:image/png;base64,%s" width="100%%">\n', base64enc::base64encode(pngf)))

Services

None