One example test requires graphviz, so that should be conditionally skipped
Some tests were checking path normalisation explicitly in POSIX format, so result in different plain text on Windows
One test runs true /dev/null as a trial preprocessor, but this will fail on Windows. I'm not sure of a better solution myself, so just skip this on Windows
I'm not sure that the path normalisation tests are doing the correct thing -- we probably actually want to always use URL formatting of paths (see #515 for some discussion)
true /dev/nullas a trial preprocessor, but this will fail on Windows. I'm not sure of a better solution myself, so just skip this on WindowsI'm not sure that the path normalisation tests are doing the correct thing -- we probably actually want to always use URL formatting of paths (see #515 for some discussion)