我有一个图书模型，它是一个 ruby 脚本，可将价格分配给程序中提到的某些预定义图书标题。这是书本模型的外观：-
class Book
attr_accessor :books
def initialize books
puts "Welcome to setting book price program"
@books = books
end
def get_prices
puts "Please enter appropriate price for each book item:-"
count = 0
@books = @books.inject({}) { |hash, book|
print "#{book.first}: "
price = STDIN.gets.chomp
while (price !~ /^[1-9]\d*$/ && price != "second hand")
puts "Price can't be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate price in integer"
price = STDIN.gets.chomp #gets.chomp - throws error
end
price == "second hand" ? price = "100" : price #takes a default price
hash[book.first] = price.to_i
hash
}
end
end
books = {"The Last Samurai" => nil,
"Ruby Cookbook" => nil,
"Rails Recipes" => nil,
"Agile Development with Rails" => nil,
"Harry Potter and the Deathly Hallows" => nil}
book_details = Book.new(books)
book_details.get_prices
puts "\n*******Books Details:#{book_details.books}******\n"
我正在尝试编写一个测试用例来检查每本书的价格输入是否正确。如果价格输入不正确，它应该要求用户重新输入正确的价格。该程序做得很好。但是当我尝试使用 RSpec 模拟这种行为时，我遇到了困难。
require 'spec_helper'
describe Book do
before :each do
books = {"The Last Samurai" => nil,
"Ruby Cookbook" => nil,
"Rails Recipes" => nil,
"Agile Development with Rails" => nil,
"Harry Potter and the Deathly Hallows" => nil}
@book = Book.new(books)
end
describe "#new" do
it "Should be an instance of the Book" do
@book.should be_an_instance_of Book
end
end
describe "#getprice" do
it "Should get the price in the correct format or else return appropriate error" do
puts "\n************************************************************************\n"
book_obj = @book
STDOUT.should_receive(:puts).and_return("Welcome to setting book price program")
book_obj.get_prices.should_not be_nil
book_obj.books["The Last Samurai"].stub!(:gets) {"40"} #trying to set the value for one book using Hash
book_obj.books["The Last Samurai"].should == 40 #verifying the value set for a particular key is accurate
end
end
end
您甚至可以从 Github克隆此代码以从您的角度进行尝试。我正在使用 Ruby 1.9.3 和 rspec 2.11.0
The error that I'm getting currently is:-
Failures:
1) Book#getprice Should get the price in the correct format or else return appropriate error
Failure/Error: book_obj.books["The Last Samurai"].stub!(:gets) {"40"} #trying to set the value for one book using Hash
TypeError:
can't define singleton
# ./spec/book_spec.rb:31:in `block (3 levels) in <top (required)>'
Finished in 7.61 seconds
2 examples, 1 failure
Failed examples:
rspec ./spec/book_spec.rb:21 # Book#getprice Should get the price in the correct format or else return appropriate error
更新的问题
对于错误的用户输入，使用以下测试用例，我收到以下错误。我怎样才能正确处理这个？我尝试了几个选项，但它们似乎都失败了。请参阅作为规范片段一部分的每个选项的注释。
it "Incorrect input format should return error message asking user to re input" do
puts "\n************************************************************************\n"
book_obj = @book
STDIN.stub(:gets) { "40abc" }
#book_obj.get_prices.should be_nil --> adding this line of code goes into an infinite loop with the error message below
#Price cannot be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate duration in integer\n
STDOUT.should_receive(:puts).and_return("Price cannot be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate duration in integer\n")
#the below two tests fails with syntax error - don't seem that easy to figure out what's going wrong
#STDOUT.should_receive("Price cannot be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate duration in integer\n")
#STDOUT.should == "Price cannot be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate duration in integer\n"
end
Failures:
1) Book#getprice Incorrect input format should return error message asking user to re input
Failure/Error: STDOUT.should_receive(:puts).and_return("Price cannot be 0 or a negative integer or in decimal format or alphanumeric. \nPlease input appropriate duration in integer\n")
(#<IO:0x00000001c7b298>).puts(any args)
expected: 1 time
received: 0 times
# ./spec/book_spec.rb:40:in `block (3 levels) in <top (required)>'
我真的很感激任何指导如何做到这一点。谢谢你。