ruby on rails - How to generate a temporary file for use in a unit test? -

the method test allows adding path additional files user adds contain data.

for example, user might store file called data.txt in /workspace/data directory. , want add path directory existing array called data_path.

method:

def add_custom_path(path)   data_path.unshift(path) end

where path location in rails app user stores file.

the gem uses test-unit.

question:

is there way temparily generate file in directory, run assert_not_empty test, , have file disappear?

i don't have experience writing tests gems guidance appreciated.

the .create , .new methods of ruby's tempfile take second argument directory want file in, , files created tempfile automatically deleted when temporary file's file object garbage-collected or ruby exits. can create temporary file,

tempfile = tempfile.new('filename', 'directoryname')

write it, test , let ruby clean you.

note first argument not entire unqualified name of file, part tempfile adds disambiguating characters, can safely more once in test suite.

also, if need file have particular suffix, can e.g.

tempfile = tempfile.new(['filename', '.rb'], 'directoryname')

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