Grapvhiz native in Windows: JSON format not supported.

[kerkhofsd]

When using the GraphvizCmdLineEngine on Windows with a JSON as output, the following error appears:
Format: "json" not recognized. Use one of: bmp canon cmap cmapx cmapx_np dot emf emfplus eps fig gd gd2 gif gv imap imap_np ismap jpe jpeg jpg metafile pdf pic plain plain-ext png pov ps ps2 svg svgz tif tiff tk vml vmlz vrml wbmp xdot xdot1.2 xdot1.

=> It seems that the JSON output format is not supported on Windows machines.

[nidi3]

Maybe updating dot could help.
But otherwise, what should happen other than an exception to be thrown?
Or does this break a test?

[kerkhofsd]

Indeed, there are tests that do not run on Windows.
Since now the native dot engine is used first, all the tests that use Format.JSON fail on Windows...

I have Graphviz 2.38 installed, which is the latest stable version if I'm correct :-/

[nidi3]

For MacOS, there is 2.40.1 available 😁
I'm going to change the tests so that they use JS instead.