spec/ruby/core/module/const_missing_spec.rb


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

require_relative '../../spec_helper'
require_relative '../../fixtures/constants'

describe "Module#const_missing" do
  it "is called when an undefined constant is referenced via literal form" do
    ConstantSpecs::ClassA::CS_CONSTX.should == :CS_CONSTX
  end

  it "is called when an undefined constant is referenced via #const_get" do
    ConstantSpecs::ClassA.const_get(:CS_CONSTX).should == :CS_CONSTX
  end

  it "raises NameError and includes the name of the value that wasn't found" do
    -> {
      ConstantSpecs.const_missing("HelloMissing")
    }.should raise_error(NameError, /ConstantSpecs::HelloMissing/)
  end

  it "raises NameError and does not include toplevel Object" do
    begin
      Object.const_missing("HelloMissing")
    rescue NameError => e
      e.message.should_not =~ / Object::/
    end
  end

  it "is called regardless of visibility" do
    klass = Class.new do
      def self.const_missing(name)
        "Found:#{name}"
      end
      private_class_method :const_missing
    end
    klass::Hello.should == 'Found:Hello'
  end
end