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#Ruby #Rspec mock method chain ( is it correct way ? )
class User
def initialize(name:, age: )
@name = name
@age = age
end
attr_reader :name, :age
def book
Book.new(author: name)
end
def book_number
book.number
end
end
class Book
def initialize(author: nil)
@author = author
@number = Random.rand(999_999)
end
attr_reader :author, :number
end
require "rspec"
describe do
context "No mock" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
is_expected.to be_a Integer
expect(user.name).to eq "Alice"
expect(user.age).to eq 20
end
end
context "NG mock" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
# NoMethodError:
# undefined method `number' for nil:NilClass
allow(user).to receive(:book)
is_expected.to be_a Integer
expect(user.name).to eq "Alice"
expect(user.age).to eq 20
end
end
context "OK allow mock" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
allow(user).to receive(:book).and_return Book.new
is_expected.to be_a Integer
expect(user.name).to eq "Alice"
expect(user.age).to eq 20
end
end
context "OK expect mock" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
expect(user).to receive(:book).and_return Book.new
is_expected.to be_a Integer
expect(user.name).to eq "Alice"
expect(user.age).to eq 20
end
end
context "NG expect mock (method chain)" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
# Failure/Error: expect(user.book).to receive(:number)
#
# (#<Book:0x00007fd5468f4aa8 @author="Alice", @number=415630>).number(*(any args))
# expected: 1 time with any arguments
# received: 0 times with any arguments
expect(user.book).to receive(:number)
is_expected.to be_a Integer
end
end
context "OK expect mock (method chain)" do
subject { user.book_number }
let(:user) { User.new(name: "Alice", age: 20) }
it do
allow(user).to receive(:book).and_return Book.new
expect(user.book).to receive(:number).and_call_original
is_expected.to be_a Integer
end
end
end
Original by Github issue
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公開日時
2020-04-24
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