Add FileHandle convenience methods and new file system tests #392
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Add
FileHandle::into_directory
andFileHandle::into_regular_file
. These can be more convenient thanFileHandle::into_type
when you know what type of file you expect.Add code in xtask to build a disk image with a FAT partition, then run file system tests against that disk (when the test runner is built with the qemu feature). A disk image is used instead of QEMU's VVFAT option so that everything is fully controlled (can test exact FS info values) and isolated from the host.
This partially addresses #57. There are some more partition and file system tests that can be added later.