How to test pdf files

Published On - April 29, 2019

dileep

class EmployeeWriter attr_accessor :employee, :output_file def initialize(employee, output_file) @employee = employee @output_file = output_file end def export_to_pdf Prawn::Document.generate(output_file) do bounding_box([0, cursor], width: 200) do text “Name: #{employee.name}” text “Employee id: #{employee.employee_id}” text “Occupation: #{employee.occupation}” stroke_bounds end end And we have Employee class 

  class Employee
    attr_accessor :name, :employee_id, :occupation
    def initialize(name, employee_id, occupation)
      @name = name
      @employee_id = employee_id
      @occupation = occupation
    end
  end
Now 
EmployeeWriter.new(
    Employee.new("name", "employee_id", "occupation")
    'filename.pdf'
  ).export_to_pdf
will give us the following pdf Now let us write test which ensure pdf has right contents. We read the data using Pdfreader First get the pdf-reader 
gem install pdf-reader -v 1.4.0
RSpec.describe EmployeeWriter do
  it "should have correct content" do
    employee = Employee.new("employee_name", "employee_id", "developer")
    EmployeeWriter.new(employee, 'employee.pdf').export_to_pdf
    reader = PDF::Reader.new('employee.pdf')
    pdf_content = reader.pages[0].to_s
    expect(pdf_content).to include('Name: employee_name')
    expect(pdf_content).to include('Employee id: employee_id')
    expect(pdf_content).to include('Occupation: developer')
  end
end
 ]]>