Rspec-core: Kesalahan "jumlah argumen salah" saat menggunakan "subjek (: inisialisasi)"

Dibuat pada 2 Mar 2017  ·  3Komentar  ·  Sumber: rspec/rspec-core

Hai, saya pikir masalah ini serupa dengan https://github.com/rspec/rspec-core/issues/1163

Saat menggunakan subject(:initialize) , rspec-core memunculkan kesalahan ArgumentError: wrong number of arguments (1 for 0)

Saya menggunakan spesifikasi ini untuk mensimulasikannya:

require 'rspec'

class LalaPopo
  attr_reader :lala

  def initialize
    <strong i="12">@lala</strong> = 1
  end
end

describe LalaPopo do
  describe '.initialize_it' do
    subject(:initialize) { described_class.new }

    it 'does something' do
      instance = initialize

      expect(instance.lala).to eq 1
    end
  end
end

dan lari:

$ rspec test_rspec.rb

kesalahan yang saya terima:

Failures:

  1) LalaPopo.initialize_it does something
     Got 0 failures and 2 other errors:

     1.1) Failure/Error: define_method(name) { __memoized.fetch_or_store(name) { super(&nil) } }

          ArgumentError:
            wrong number of arguments (1 for 0)
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/memoized_helpers.rb:295:in `block in let'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:588:in `new'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:588:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `block in run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (3 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (2 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/configuration.rb:1875:in `with_suite_hooks'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:113:in `block in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/reporter.rb:78:in `report'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:112:in `run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:87:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:71:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:45:in `invoke'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/exe/rspec:4:in `<top (required)>'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `load'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `<main>'
          # 
          #   Showing full backtrace because every line was filtered out.
          #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
          #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

     1.2) Failure/Error: define_method(name) { __memoized.fetch_or_store(name) { super(&nil) } }

          ArgumentError:
            wrong number of arguments (1 for 0)
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/memoized_helpers.rb:295:in `block in let'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:600:in `new'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:600:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `block in run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (3 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (2 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/configuration.rb:1875:in `with_suite_hooks'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:113:in `block in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/reporter.rb:78:in `report'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:112:in `run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:87:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:71:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:45:in `invoke'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/exe/rspec:4:in `<top (required)>'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `load'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `<main>'
          # 
          #   Showing full backtrace because every line was filtered out.
          #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
          #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

  2) LalaPopo.initialize_it does something
     Got 0 failures and 2 other errors:

     2.1) Failure/Error: define_method(name) { __memoized.fetch_or_store(name) { super(&nil) } }

          ArgumentError:
            wrong number of arguments (1 for 0)
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/memoized_helpers.rb:295:in `block in let'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:588:in `new'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:588:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `block in run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (3 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (2 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/configuration.rb:1875:in `with_suite_hooks'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:113:in `block in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/reporter.rb:78:in `report'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:112:in `run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:87:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:71:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:45:in `invoke'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/exe/rspec:4:in `<top (required)>'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `load'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `<main>'
          # 
          #   Showing full backtrace because every line was filtered out.
          #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
          #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

     2.2) Failure/Error: define_method(name) { __memoized.fetch_or_store(name) { super(&nil) } }

          ArgumentError:
            wrong number of arguments (1 for 0)
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/memoized_helpers.rb:295:in `block in let'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:600:in `new'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:600:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `block in run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/example_group.rb:590:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (3 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `map'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:118:in `block (2 levels) in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/configuration.rb:1875:in `with_suite_hooks'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:113:in `block in run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/reporter.rb:78:in `report'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:112:in `run_specs'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:87:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:71:in `run'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/lib/rspec/core/runner.rb:45:in `invoke'
          # /home/fabio/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rspec-core-3.6.0.beta2/exe/rspec:4:in `<top (required)>'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `load'
          # /home/fabio/.rbenv/versions/2.1.5/bin/rspec:23:in `<main>'
          # 
          #   Showing full backtrace because every line was filtered out.
          #   See docs for RSpec::Configuration#backtrace_exclusion_patterns and
          #   RSpec::Configuration#backtrace_inclusion_patterns for more information.

Finished in 0.0011 seconds (files took 0.11722 seconds to load)
2 examples, 2 failures

Failed examples:

rspec ./test_rspec.rb:15 # LalaPopo.initialize_it does something
rspec ./test_rspec.rb:15 # LalaPopo.initialize_it does something

Saya tahu ini aneh untuk membuat subject(:initialize) , tetapi saya menemukan masalah ini di sistem lama, ketika saya mencoba memutakhirkan rspec dari 3.0.0 ke 3.5.0!

picture fabioperrella

Komentar yang paling membantu

Apakah menurut Anda RSpec harus mendeteksi ini sebelum mencoba mendefinisikan ulang #initialize?

Maksud Anda ketika pengguna melakukan let(:initialize) , haruskah RSpec memperingatkan pengguna tentang hal itu? Itu bukan ide yang buruk.

picture myronmarston pada 2 Mar 2017
👍2

Semua 3 komentar

Masalah ini terjadi karena fakta bahwa grup contoh RSpec adalah kelas, dan itu harus membuat instance dari mereka--di mana Ruby memanggil metode initialize --untuk menjalankannya. Di RSpec 3.0.0, RSpec tidak mendefinisikan def initialize , jadi ExampleGroup.new tidak mengambil argumen apa pun, dan tidak menghasilkan kesalahan. Namun, contoh Anda masih tidak berfungsi dengan baik di RSpec 3.0.0--hanya saja tidak gagal dengan keras. Karena let mendefinisikan sebuah metode, pada RSpec 3.0, ExampleGroup.new menyebabkan initialize dijalankan, artinya metode tersebut dijalankan dengan penuh semangat ketika let didokumentasikan sebagai malas.

Semua itu untuk mengatakan: mengingat status khusus initialize di Ruby, saya rasa kami tidak dapat mendukung let(:initialize) . Jika Anda mengganti namanya menjadi sesuatu yang lain, itu akan berhasil.

myronmarston picture myronmarston pada 2 Mar 2017
👍2

Apakah menurut Anda RSpec harus mendeteksi ini sebelum mencoba mendefinisikan ulang #initialize ?

mikegee picture mikegee pada 2 Mar 2017

Apakah menurut Anda RSpec harus mendeteksi ini sebelum mencoba mendefinisikan ulang #initialize?

Maksud Anda ketika pengguna melakukan let(:initialize) , haruskah RSpec memperingatkan pengguna tentang hal itu? Itu bukan ide yang buruk.

myronmarston picture myronmarston pada 2 Mar 2017
👍2
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