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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
ruby_version_is '1.9' do
describe "Kernel#define_singleton_method" do
describe "when given an UnboundMethod" do
class DefineSingletonMethodSpecClass
MY_CONST = 42
define_singleton_method(:another_test_method, self.method(:constants))
end
it "correctly calls the new method" do
klass = DefineSingletonMethodSpecClass
klass.another_test_method.should == klass.constants
end
it "adds the new method to the methods list" do
DefineSingletonMethodSpecClass.should have_method(:another_test_method)
end
ruby_bug "redmine:2117", "1.8.7" do
it "defines any Child class method from any Parent's class methods" do
um = KernelSpecs::Parent.method(:parent_class_method).unbind
KernelSpecs::Child.send :define_singleton_method, :child_class_method, um
KernelSpecs::Child.child_class_method.should == :foo
lambda{KernelSpecs::Parent.child_class_method}.should raise_error(NoMethodError)
end
it "will raise when attempting to define an object's singleton method from another object's singleton method" do
other = KernelSpecs::Parent.new
p = KernelSpecs::Parent.new
class << p
def singleton_method
:single
end
end
um = p.method(:singleton_method).unbind
lambda{ other.send :define_singleton_method, :other_singleton_method, um }.should raise_error(TypeError)
end
end
end
it "defines a new method with the given name and the given block as body in self" do
class DefineSingletonMethodSpecClass
define_singleton_method(:block_test1) { self }
define_singleton_method(:block_test2, &lambda { self })
end
o = DefineSingletonMethodSpecClass
o.block_test1.should == o
o.block_test2.should == o
end
it "raises a TypeError when the given method is no Method/Proc" do
lambda {
Class.new { define_singleton_method(:test, "self") }
}.should raise_error(TypeError)
lambda {
Class.new { define_singleton_method(:test, 1234) }
}.should raise_error(TypeError)
end
it "defines a new singleton method for objects" do
s = "hello"
s.define_singleton_method(:test) { "world!" }
s.test.should == "world!"
lambda {
"hello".test
}.should raise_error(NoMethodError)
end
it "maintains the Proc's scope" do
class DefineMethodByProcClass
in_scope = true
method_proc = proc { in_scope }
define_singleton_method(:proc_test, &method_proc)
end
DefineMethodByProcClass.proc_test.should == true
end
end
end
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