The "test-fuzz" command:

Usage: fossil test-fuzz [-fuzztype TYPE] INPUTFILE...

Run a fuzz test using INPUTFILE as the test data. TYPE can be one of:

comformat

Fuzz the comment_print() routine

wiki

Fuzz the Fossil-wiki translator

markdown

Fuzz the markdown translator

artifact

Fuzz the artifact parser

wiki2

Fuzz the Fossil-wiki and markdown translator