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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Class.new with a block given" do
it "yields the new class as self in the block" do
self_in_block = nil
klass = Class.new do
self_in_block = self
end
self_in_block.should equal klass
end
it "uses the given block as the class' body" do
klass = Class.new do
def self.message
"text"
end
def hello
"hello again"
end
end
klass.message.should == "text"
klass.new.hello.should == "hello again"
end
it "creates a subclass of the given superclass" do
sc = Class.new do
def self.body
@body
end
@body = self
def message; "text"; end
end
klass = Class.new(sc) do
def self.body
@body
end
@body = self
def message2; "hello"; end
end
klass.body.should == klass
sc.body.should == sc
klass.superclass.should == sc
klass.new.message.should == "text"
klass.new.message2.should == "hello"
end
it "runs the inherited hook after yielding the block" do
ScratchPad.record []
klass = Class.new(CoreClassSpecs::Inherited::D) do
ScratchPad << self
end
ScratchPad.recorded.should == [CoreClassSpecs::Inherited::D, klass]
end
end
describe "Class.new" do
it "creates a new anonymous class" do
klass = Class.new
klass.is_a?(Class).should == true
klass_instance = klass.new
klass_instance.is_a?(klass).should == true
end
it "raises a TypeError if passed a metaclass" do
obj = mock("Class.new metaclass")
meta = obj.singleton_class
-> { Class.new meta }.should raise_error(TypeError)
end
it "creates a class without a name" do
Class.new.name.should be_nil
end
it "creates a class that can be given a name by assigning it to a constant" do
::MyClass = Class.new
::MyClass.name.should == "MyClass"
a = Class.new
MyClass::NestedClass = a
MyClass::NestedClass.name.should == "MyClass::NestedClass"
end
it "sets the new class' superclass to the given class" do
top = Class.new
Class.new(top).superclass.should == top
end
it "sets the new class' superclass to Object when no class given" do
Class.new.superclass.should == Object
end
it "raises a TypeError when given a non-Class" do
error_msg = /superclass must be a Class/
-> { Class.new("") }.should raise_error(TypeError, error_msg)
-> { Class.new(1) }.should raise_error(TypeError, error_msg)
-> { Class.new(:symbol) }.should raise_error(TypeError, error_msg)
-> { Class.new(mock('o')) }.should raise_error(TypeError, error_msg)
-> { Class.new(Module.new) }.should raise_error(TypeError, error_msg)
end
end
describe "Class#new" do
it "returns a new instance of self" do
klass = Class.new
klass.new.is_a?(klass).should == true
end
it "invokes #initialize on the new instance with the given args" do
klass = Class.new do
def initialize(*args)
@initialized = true
@args = args
end
def args
@args
end
def initialized?
@initialized || false
end
end
klass.new.should.initialized?
klass.new(1, 2, 3).args.should == [1, 2, 3]
end
it "uses the internal allocator and does not call #allocate" do
klass = Class.new do
def self.allocate
raise "allocate should not be called"
end
end
instance = klass.new
instance.should be_kind_of klass
instance.class.should equal klass
end
it "passes the block to #initialize" do
klass = Class.new do
def initialize
yield
end
end
klass.new { break 42 }.should == 42
end
end
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