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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Module#instance_method" do
before :all do
@parent_um = ModuleSpecs::InstanceMeth.instance_method(:foo)
@child_um = ModuleSpecs::InstanceMethChild.instance_method(:foo)
@mod_um = ModuleSpecs::InstanceMethChild.instance_method(:bar)
end
it "is a public method" do
Module.should have_public_instance_method(:instance_method, false)
end
it "requires an argument" do
Module.new.method(:instance_method).arity.should == 1
end
it "returns an UnboundMethod corresponding to the given name" do
@parent_um.should be_kind_of(UnboundMethod)
@parent_um.bind(ModuleSpecs::InstanceMeth.new).call.should == :foo
end
it "returns an UnboundMethod corresponding to the given name from a superclass" do
@child_um.should be_kind_of(UnboundMethod)
@child_um.bind(ModuleSpecs::InstanceMethChild.new).call.should == :foo
end
it "returns an UnboundMethod corresponding to the given name from an included Module" do
@mod_um.should be_kind_of(UnboundMethod)
@mod_um.bind(ModuleSpecs::InstanceMethChild.new).call.should == :bar
end
it "returns an UnboundMethod when given a protected method name" do
ModuleSpecs::Basic.instance_method(:protected_module).should be_an_instance_of(UnboundMethod)
end
it "returns an UnboundMethod when given a private method name" do
ModuleSpecs::Basic.instance_method(:private_module).should be_an_instance_of(UnboundMethod)
end
it "gives UnboundMethod method name, Module defined in and Module extracted from" do
@parent_um.inspect.should =~ /\bfoo\b/
@parent_um.inspect.should =~ /\bModuleSpecs::InstanceMeth\b/
@parent_um.inspect.should =~ /\bModuleSpecs::InstanceMeth\b/
@child_um.inspect.should =~ /\bfoo\b/
@child_um.inspect.should =~ /\bModuleSpecs::InstanceMeth\b/
@child_um.inspect.should =~ /\bModuleSpecs::InstanceMethChild\b/
@mod_um.inspect.should =~ /\bbar\b/
@mod_um.inspect.should =~ /\bModuleSpecs::InstanceMethMod\b/
@mod_um.inspect.should =~ /\bModuleSpecs::InstanceMethChild\b/
end
it "raises a TypeError if not passed a symbol" do
lambda { Object.instance_method([]) }.should raise_error(TypeError)
lambda { Object.instance_method(0) }.should raise_error(TypeError)
end
it "raises a TypeError if the given name is not a string/symbol" do
lambda { Object.instance_method(nil) }.should raise_error(TypeError)
lambda { Object.instance_method(mock('x')) }.should raise_error(TypeError)
end
it "raises a NameError if the method has been undefined" do
child = Class.new(ModuleSpecs::InstanceMeth)
child.send :undef_method, :foo
um = ModuleSpecs::InstanceMeth.instance_method(:foo)
um.should == @parent_um
lambda do
child.instance_method(:foo)
end.should raise_error(NameError)
end
it "raises a NameError if the method does not exist" do
lambda { Object.instance_method(:missing) }.should raise_error(NameError)
end
it "sets the NameError#name attribute to the name of the missing method" do
begin
Object.instance_method(:missing)
rescue NameError => e
e.name.should == :missing
end
end
end
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