How can subprocess be used in a class and tested in python

Question

I have an executable that has many options and I wish to create classes. e.g. the exec has options that can copy rows of a file, rename parts of a file, compress file, count specific rows of a file, e.t.c. Each option has parameters. I am uncertain if I am going about it the wrong way but I want to use oop.

import subprocess

class ExecProcess:
    def __init__(self, myfile, tempfile, outfile):
        self.myfile = myfile
        self.tempfile = tempfile
        self.outfile = outfile
        self.compressed_file = self.outfile + 'zip'

    def copy(self, myfile):
        temp_copy = subprocess.call(['executable', '-c', self.myfile, '-out', self.tempfile])
        return temp_copy # should this be return self.tempfile which is the output?

    def rename(self, myfile, tempfile, outfile): # need to include all the variables I declared in init?
        output = subprocess.call(['executable', '-i', self.myfile, '-r', self.tempfile'-out', self.compressed_file])
        return output # return self.outfile?

Given the above, how do I call the methods within the class and then write tests for them e.g using pytest. Its not intuitive to me how to test subprocess calls using pytest

The results of each call is a different file each time with each subsequent command taking the file from an earlier command as input. Please note, myfile is the only original file I have. tempfile and outfile are just variable names I assigned to the results.

Any help will be appreciated

Answer 1

import subprocess

class Switch():

    def __init__(self, ip):
        self.ip = ip
        self.subproc = subprocess
    
    def ping(self): 
        
        success_ping = 0
        
        for i in range(3):
            status = self.subproc.call( ['ping', '-c', '1', '-W', '0.05', self.ip], stdout=self.subproc.DEVNULL )

            if status == 0:
                success_ping += 1   

        if success_ping > 0:
            return True
        else:
            return False

    def get_ip(self):
        return ('Switch IP: '+self.ip)

sw = Switch('192.168.1.1')

if (sw.ping):
    print('Switch', sw.get_ip(), 'UP')
else:
    print('Switch', sw.get_ip(), 'DOWN')

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