R: non-ASCII characters in test name are not printed properly

[Voileexperiments]

Related: #67

test_that("two_oldest_ages µ", {
  expect_equal(two_oldest_ages(c(1,5,87,45,8,8)), c(45,87))
  expect_equal(two_oldest_ages(c(6,5,83,5,3,18)), c(18,83))
})

gives

Note: I'm not sure if the issue comes from CW formatter or the test framework itself.

[kazk]

I don't think it's the reporter and I don't know how to fix this at the moment.

I found cat("µ\n") works in solution.R, but doesn't in tests.R.
tests.R is loaded differently using test_file function from the test framework.

R tests are executed by running entry point file (run-tests.R) that looks like this:

library(testthat) # use test framework
source("/path/to/codewars-reporter.R") # load reporter
source("solution.R") # load solution
# run all tests in `tests.R`
test_file("tests.R", reporter=CodewarsReporter$new())