Rake NoMethodError: undefined method 'scan' for Lexicon:Class

Question

当我尝试使用以下 RakeFile 运行 rake 测试时，我收到 NoMethodError: undefined method 'scan' for Lexicon:Class。

require './lib/ex48/lexicon.rb'
require 'test/unit'

class TestLexicon < Test::Unit::TestCase

    def test_directions
        assert_equal(Lexicon.scan('north'), [%w(direction north)])
    end

end

我有一个简单的 Lexicon 类：

class Lexicon

  def initialize
    @direction = %w(north south east west down up left right back)
    @verbs = %w(go stop kill eat)
    @stop_words = %w(the in of from at it)
    @nouns = %w(door bear princess cabinet)
    @numbers = (0..9)
  end

  attr_reader :direction, :verbs, :stop_words, :nouns, :numbers

  def scan(input)
    words = input.split
    result = []

    words.each do |word|
      if @direction.include? word
        result.push ['direction', word]
        next
      end

      if @verbs.include? word
        result.push ['verb', word]
        next
      end

      if @stop_words.include? word
        result.push ['stop', word]
        next
      end

      if @nouns.include? word
        result.push ['noun', word]
        next
      end

      result.push ['number', word] if @numbers.include? word
    end

    result
  end

end

我想看看扫描方法是否有效。我正在学习 Ruby，所以我是这门语言的新手，这是我的第二次 RakeFile 测试。我做错了什么？

Answer 1

def self.scan 以便使方法成为 class 方法，而不是实例方法（在 class 的实例上调用）。或者简单地使用 Lexicon.new(args).scan

Rake NoMethodError: undefined method 'scan' for Lexicon:Class

Rake NoMethodError: undefined method 'scan' for Lexicon:Class

ruby

rake

nomethoderror