Generate fake CSV to test with rspec - csv

Question

I want to test my method which import a CSV file.
But I don't know how to generate fake CSV files to test it.
I tried a lot of solution I already found on stack but it's not working in my case.
Here is the csv original file :
firstname,lastname,home_phone_number,mobile_phone_number,email,address
orsay,dup,0154862548,0658965848,orsay.dup#gmail.com,2 rue du pré paris
richard,planc,0145878596,0625147895,richard.planc#gmail.com,45 avenue du general leclerc
person.rb
def self.import_data(file)
filename = File.join Rails.root, file
CSV.foreach(filename, headers: true, col_sep: ',') do |row|
firstname, lastname, home_phone_number, mobile_phone_number, email, address = row
person = Person.find_or_create_by(firstname: row["firstname"], lastname: row['lastname'], address: row['address'] )
if person.is_former_email?(row['email']) != true
person.update_attributes({firstname: row['firstname'], lastname: row['lastname'], home_phone_number: row['home_phone_number'], mobile_phone_number: row['mobile_phone_number'], address: row['address'], email: row['email']})
end
end
end
person_spec.rb :
require "rails_helper"
RSpec.describe Person, :type => :model do
describe "CSV file is valid" do
file = #fake file
it "should read in the csv" do
end
it "should have result" do
end
end
describe "import valid data" do
valid_data_file = #fake file
it "save new people" do
Person.delete_all
expect { Person.import_data(valid_data_file)}.to change{ Person.count }.by(2)
expect(Person.find_by(lastname: 'dup').email).to eq "orsay.dup#gmail.com"
end
it "update with new email" do
end
end
describe "import invalid data" do
invalid_data_file = #fake file
it "should not update with former email" do
end
it "should not import twice from CSV" do
end
end
end

Answer 1

I successfully used the Faked CSV Gem from https://github.com/jiananlu/faked_csv to achieve your purpose of generating a CSV File with fake data.
Follow these steps to use it:
Open your command line (i.e. on OSX open Spotlight with CMD+Space, and enter "Terminal")
Install Faked CSV Gem by running command gem install faked_csv. Note: If using a Ruby on Rails project add gem 'faked_csv' to your Gemfile, and then run bundle install
Validate Faked CSV Gem installed successfully by typing in Bash Terminal faked_csv --version
Create a Configuration File for the Faked CSV Gem and where you define how to generate fake data. For example, the below will generate a CSV file with 200 rows (or edit to as many as you wish) and contain comma separated columns for each field. If the value of field type is prefixed with faker: then refer to the "Usage" section of the Faker Gem https://github.com/stympy/faker for examples.
my_faked_config.csv.json
{
"rows": 200,
"fields": [
{
"name": "firstname",
"type": "faker:name:first_name",
"inject": ["luke", "dup", "planc"]
},
{
"name": "lastname",
"type": "faker:name:last_name",
"inject": ["schoen", "orsay", "richard"]
},
{
"name": "home_phone_number",
"type": "rand:int",
"range": [1000000000, 9999999999]
},
{
"name": "mobile_phone_number",
"type": "rand:int",
"range": [1000000000, 9999999999]
},
{
"name": "email",
"type": "faker:internet:email"
},
{
"name": "address",
"type": "faker:address:street_address",
"rotate": 200
}
]
}
Run the following command to use the configuration file my_faked_config.csv.json to generate a CSV file in the current folder named my_faked_data.csv, which contains the fake data faked_csv -i my_faked_config.csv.json -o my_faked_data.csv
Since the generated file may not include the associated Label for each column after generation, simply manually insert the following line at the top of my_faked_data.csv firstname,lastname,home_phone_number,mobile_phone_number,email,address
Review the final contents of the my_faked_data.csv CSV file containing the fake data, which should appear similar to the following:
my_faked_data.csv
firstname,lastname,home_phone_number,mobile_phone_number,email,address
Kyler,Eichmann,8120675609,7804878030,norene#bergnaum.io,56006 Fadel Mission
Hanna,Barton,9424088332,8720530995,anabel#moengoyette.name,874 Leannon Ways
Mortimer,Stokes,5645028548,9662617821,moses#kihnlegros.org,566 Wilderman Falls
Camden,Langworth,2622619338,1951547890,vincenza#gaylordkemmer.info,823 Esmeralda Pike
Nikolas,Hessel,5476149226,1051193757,jonathon#ziemannnitzsche.name,276 Reinger Parks
...
Modify your person_spec.rb Unit Test using the technique shown below, which passes in Mock data to test functionality of the import_data function of your person.rb file
person_spec.rb
require 'rails_helper'
RSpec.describe Person, type: :model do
describe 'Class' do
subject { Person }
it { should respond_to(:import_data) }
let(:data) { "firstname,lastname,home_phone_number,mobile_phone_number,email,address\r1,Kyler,Eichmann,8120675609,7804878030,norene#bergnaum.io,56006 Fadel Mission" }
describe "#import_data" do
it "save new people" do
File.stub(:open).with("filename", {:universal_newline=>false, :headers=>true}) {
StringIO.new(data)
}
Product.import("filename")
expect(Product.find_by(firstname: 'Kyler').mobile_phone_number).to eq 7804878030
end
end
end
end
Note: I used it myself to generate a large CSV file with meaningful fake data for my Ruby on Rails CSV app. My app allows a user to upload a CSV file containing specific column names and persist it to a PostgreSQL database and it then displays the data in a Paginated table view with the ability to Search and Sort using AJAX.

Answer 2

Use openoffice or excel and save the file out as a .csv file in the save options. A spreadsheet progam.