usage: vtest [options] file ...
    -b size                      # Set internal buffer size (default: 1M)
    -C                           # Use cleaner subprocess
    -D name=val                  # Define macro
    -E extension_shlib           # Load extension
    -i                           # Find varnish binaries in build tree
    -j jobs                      # Run this many tests in parallel
    -k                           # Continue on test failure
    -L                           # Always leave temporary vtc.*
    -l                           # Leave temporary vtc.* if test fails
    -n iterations                # Run tests this many times
    -p name=val                  # Pass a varnishd parameter
    -q                           # Quiet mode: report only failures
    -t duration                  # Time tests out after this long
    -v                           # Verbose mode: always report test log
    -V                           # print version and exit