Added test for `operatingSystem.fileSeparator` and fixed test for `operatingSystem.pathSeparator` (#5129)
Added test for `operatingSystem.fileSeparator` and fixed test for `operatingSystem.pathSeparator` (#5129)

gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon