spec/ruby/core/module/remove_class_variable_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
37
38
39
40
41
42
43
44

require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "Module#remove_class_variable" do
  it "removes class variable" do
    m = ModuleSpecs::MVars.dup
    m.send(:remove_class_variable, :@@mvar)
    m.class_variable_defined?(:@@mvar).should == false
  end

  it "returns the value of removing class variable" do
    m = ModuleSpecs::MVars.dup
    m.send(:remove_class_variable, :@@mvar).should == :mvar
  end

  it "removes a class variable defined in a metaclass" do
    obj = mock("metaclass class variable")
    meta = obj.singleton_class
    meta.send :class_variable_set, :@@var, 1
    meta.send(:remove_class_variable, :@@var).should == 1
    meta.class_variable_defined?(:@@var).should be_false
  end

  it "raises a NameError when removing class variable declared in included module" do
    c = ModuleSpecs::RemoveClassVariable.new { include ModuleSpecs::MVars.dup }
    lambda { c.send(:remove_class_variable, :@@mvar) }.should raise_error(NameError)
  end

  it "raises a NameError when passed a symbol with one leading @" do
    lambda { ModuleSpecs::MVars.send(:remove_class_variable, :@mvar) }.should raise_error(NameError)
  end

  it "raises a NameError when passed a symbol with no leading @" do
    lambda { ModuleSpecs::MVars.send(:remove_class_variable, :mvar)  }.should raise_error(NameError)
  end

  it "raises a NameError when an uninitialized class variable is given" do
    lambda { ModuleSpecs::MVars.send(:remove_class_variable, :@@nonexisting_class_variable) }.should raise_error(NameError)
  end

  it "is public" do
    Module.should_not have_private_instance_method(:remove_class_variable)
  end
end