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Test File
Test an attribute of a file and put the result in a variable.
A failed test will result in the specified result variable being cleared.
Parent Dir: the parent directory of the given file, note that it may not actually exist.
Size: file size in bytes, or for directories number of children.
Modification time: the modification time of a directory is the time a file was last added or deleted from them.
Type: either file or dir.