CODEWITHSUNDEEP
rubyrspec
keoghpe
keoghpe

Reputation: 404

RSpec thinks created file is empty

I've created a class that creates a new text file. When I try to compare it with an existing file it seems that RSpec thinks the created file is empty.

expect(open @expected).to eq(open @result)

The result:

(compared using ==)

   Diff:
   @@ -1,2 +1,2 @@
   -[]
   +["The expected output\n"]

Here's the code that creates the file:

FileUtils.touch out_path
target = File.new out_path, 'w+'

File.open(in_path, "r") do |file_handle|
  file_handle.each_line do |line|
    target.puts line
  end
end

Upvotes: 0

Views: 134

Answers (1)

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121000

You do not flush the file content to disk. Ruby will flush it itself, but whenever it decides to. To assure that the file content is flushed, one should use the block variant with File#open instead of File.new:

File.open(out_path, 'w+') do |target|
  File.open(in_path, "r") do |file_handle|
    file_handle.each_line do |line|
      target.puts line
    end
  end
end # here file is flushed

With File#new you have an option to flush the content explicitly or do implicitly by calling close.

Hope it helps.

Upvotes: 1

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