Testing the Scripts

Testing the Python Script

Because RProcessStepBuilder handles most of the R execution complexity for us, running the script is easy.

user@: my-ligare-app $ .venv/bin/python draw_plot.py > my_img.png

Testing the R Script Without Python

Python executes the equivalent of these Bash shell commands. You can do this to test your R script in exactly the same way your Python script will.

export METHOD_ARG_READ_FD=8
export IMAGE_DATA_FD=9
arg_read_tmpfile=$(mktemp)
img_data_tmpfile=$(mktemp)
exec {METHOD_ARG_READ_FD}<> "$arg_read_tmpfile"
exec {IMAGE_DATA_FD}<> "$img_data_tmpfile"
echo -e 'spacing,line_width,color,background_color\n1.2,6,"green","black"' >&$METHOD_ARG_READ_FD
/usr/bin/Rscript draw_plot.R < letter_segments.csv --output-type=png

# The image data can be written to a file with this
cat <&$IMAGE_DATA_FD > my_img.png

Of course, you can forego any method parameters and additional file descriptor configuration.

user@: my-ligare-app $ /usr/bin/Rscript draw_plot.R < letter_segments.csv > my_img.png