Exercise: Write tests for script combining files

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• This is a solution for one of the exercises in which we had to combine two files adding the numbers of the vegetables together.
• Many things could be improved, but before doing that, write a test (or two) to check this code. Without changing it.

examples/dictionary/combine_files.py

c = {}
with open('examples/files/a.txt') as fh:
    for line in fh:
        k, v = line.rstrip("\n").split("=")
        if k in c:
            c[k] += int(v)
        else:
            c[k] = int(v)

with open('examples/files/b.txt') as fh:
    for line in fh:
        k, v = line.rstrip("\n").split("=")
        if k in c:
            c[k] += int(v)
        else:
            c[k] = int(v)


with open('out.txt', 'w') as fh:
    for k in sorted(c.keys()):
        fh.write("{}={}\n".format(k, c[k]))

Data Files:

examples/files/a.txt

Tomato=78
Avocado=23
Pumpkin=100

examples/files/b.txt

Cucumber=17
Avocado=10
Cucumber=10