Garbled output with parallel testing

[Moohan]

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When I enable parallel testing in the package description, it seems to work, i.e. the tests succeed/fail as expected and the overall test run takes less time than without parallel enabled. However, the output which I get in the console or build window is really messed up and garbled:

Is this expected? If not any ideas what the issue is and if I can fix it?

Additional detail

> version
               _                           
platform       x86_64-pc-linux-gnu         
arch           x86_64                      
os             linux-gnu                   
system         x86_64, linux-gnu           
status                                     
major          3                           
minor          6.1                         
year           2019                        
month          07                          
day            05                          
svn rev        76782                       
language       R                           
version.string R version 3.6.1 (2019-07-05)
nickname       Action of the Toes       
   
> RStudio.Version()
$citation

To cite RStudio in publications use:

  RStudio Team (2016). RStudio: Integrated Development for R. RStudio, Inc., Boston, MA
  URL http://www.rstudio.com/.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {RStudio: Integrated Development Environment for R},
    author = {{RStudio Team}},
    organization = {RStudio, Inc.},
    address = {Boston, MA},
    year = {2016},
    url = {http://www.rstudio.com/},
  }


$mode
[1] "server"

$edition
[1] "Professional"

$version
[1] ‘1.1.463’