practice-go_isbn-verifier

README

This project is an exercise to develop a simple cli program

The task was created from Tino according to his go-workshop.

Task

As a (skilled) user I want to be able to pass an ISBN number via command line to a programm, which returns the same ISBN and if it's a valid ISBN-10.

Acceptance criteria

• you can run it via cli
• you can pass an ISBN string
• you can pass a path to a CSV-file with ISBNs
• passes all test-cases
• input, output and behavior matches the following examples

Example Valid single ISBN

$ validateisbn "1-24325435-3435-X"
the given input '1-24325435-3435-X' to be expected an isbn is: valid

Example Invalid single ISBN

$ validateisbn "1-thisisnotanISBN-X"
the given input '1-thisisnotanISBN-X' to be expected an isbn is: invalid

Example CSV file (input.csv)

""
0-8436-1072-7
0843610727
thisisnotanISBN

Example run with CSV file

$ validateisbn -f "input.csv"
;false;
0-8436-1072-7;true;
0843610727;true
thisisnotanISBN;false;

Steps

• define function signiture
• write unit tests for the function
• implement the function
• implement cli wrapper with one input argument for the possible isbn
• implement integration tests for the CLI
• implement input argument to pass a csv file-path with a list of possible ISBNs
• expend integration tests for the CLI with CSV file

Hints

• What is an ISBN
• How to use GO for CLI

The final result

How to build

$ go build -o validateisbn isbn.go

How to run

$ ./validateisbn "thisisnotanISBN"

How to test

$ go test isbn.go isbn_test.go

Conclusion

This was a very nice exercise. I learned a lot about go development. The hight frequent code reviews and advices from Tino helped me a lot to speed up my learning curve.