How to test input via subprocess.Popen with data from file

[Loris Bennett]

Hi,

I have a command which produces output like the
following:

  Job ID: 9431211
  Cluster: curta
  User/Group: build/staff
  State: COMPLETED (exit code 0)
  Nodes: 1
  Cores per node: 8
  CPU Utilized: 01:30:53
  CPU Efficiency: 83.63% of 01:48:40 core-walltime
  Job Wall-clock time: 00:13:35
  Memory Utilized: 6.45 GB
  Memory Efficiency: 80.68% of 8.00 GB

I want to parse this and am using subprocess.Popen and accessing the
contents via Popen.stdout.  However, for testing purposes I want to save
various possible outputs of the command as text files and use those as
inputs. 

What format should I use to pass data to the actual parsing function?

I could in both production and test convert the entire input to a string
and pass the string to the parsing method.

However, I could use something like

   test_input_01 = subprocess.Popen(
        ["cat test_input_01.txt"],
        stdout=subprocess.PIPE,
    )
  
for the test input and then pass a Popen object to the parsing function.

Any comments on these alternative or suggestions for doing something
completely different?

Cheers,

Loris
 
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