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# encoding: utf-8
require_relative '../../spec_helper'
require_relative '../../fixtures/constants'
require_relative 'fixtures/constant_unicode'
describe "Module#const_defined?" do
it "returns true if the given Symbol names a constant defined in the receiver" do
ConstantSpecs.const_defined?(:CS_CONST2).should == true
ConstantSpecs.const_defined?(:ModuleA).should == true
ConstantSpecs.const_defined?(:ClassA).should == true
ConstantSpecs::ContainerA.const_defined?(:ChildA).should == true
end
it "returns true if the constant is defined in the receiver's superclass" do
# CS_CONST4 is defined in the superclass of ChildA
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4).should be_true
end
it "returns true if the constant is defined in a mixed-in module of the receiver's parent" do
# CS_CONST10 is defined in a module included by ChildA
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST10).should be_true
end
it "returns true if the constant is defined in a mixed-in module (with prepends) of the receiver" do
# CS_CONST11 is defined in the module included by ContainerPrepend
ConstantSpecs::ContainerPrepend.const_defined?(:CS_CONST11).should be_true
end
it "returns true if the constant is defined in Object and the receiver is a module" do
# CS_CONST1 is defined in Object
ConstantSpecs::ModuleA.const_defined?(:CS_CONST1).should be_true
end
it "returns true if the constant is defined in Object and the receiver is a class that has Object among its ancestors" do
# CS_CONST1 is defined in Object
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST1).should be_true
end
it "returns false if the constant is defined in the receiver's superclass and the inherit flag is false" do
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4, false).should be_false
end
it "returns true if the constant is defined in the receiver's superclass and the inherit flag is true" do
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4, true).should be_true
end
it "coerces the inherit flag to a boolean" do
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4, nil).should be_false
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4, :true).should be_true
end
it "returns true if the given String names a constant defined in the receiver" do
ConstantSpecs.const_defined?("CS_CONST2").should == true
ConstantSpecs.const_defined?("ModuleA").should == true
ConstantSpecs.const_defined?("ClassA").should == true
ConstantSpecs::ContainerA.const_defined?("ChildA").should == true
end
it "returns true when passed a constant name with unicode characters" do
ConstantUnicodeSpecs.const_defined?("CS_CONSTλ").should be_true
end
it "returns true when passed a constant name with EUC-JP characters" do
str = "CS_CONSTλ".encode("euc-jp")
ConstantSpecs.const_set str, 1
ConstantSpecs.const_defined?(str).should be_true
end
it "returns false if the constant is not defined in the receiver, its superclass, or any included modules" do
# The following constant isn't defined at all.
ConstantSpecs::ContainerA::ChildA.const_defined?(:CS_CONST4726).should be_false
# DETACHED_CONSTANT is defined in ConstantSpecs::Detached, which isn't
# included by or inherited from ParentA
ConstantSpecs::ParentA.const_defined?(:DETACHED_CONSTANT).should be_false
end
it "does not call #const_missing if the constant is not defined in the receiver" do
ConstantSpecs::ClassA.should_not_receive(:const_missing)
ConstantSpecs::ClassA.const_defined?(:CS_CONSTX).should == false
end
describe "converts the given name to a String using #to_str" do
it "calls #to_str to convert the given name to a String" do
name = mock("ClassA")
name.should_receive(:to_str).and_return("ClassA")
ConstantSpecs.const_defined?(name).should == true
end
it "raises a TypeError if the given name can't be converted to a String" do
-> { ConstantSpecs.const_defined?(nil) }.should raise_error(TypeError)
-> { ConstantSpecs.const_defined?([]) }.should raise_error(TypeError)
end
it "raises a NoMethodError if the given argument raises a NoMethodError during type coercion to a String" do
name = mock("classA")
name.should_receive(:to_str).and_raise(NoMethodError)
-> { ConstantSpecs.const_defined?(name) }.should raise_error(NoMethodError)
end
end
it "special cases Object and checks it's included Modules" do
Object.const_defined?(:CS_CONST10).should be_true
end
it "returns true for toplevel constant when the name begins with '::'" do
ConstantSpecs.const_defined?("::Array").should be_true
end
it "returns true when passed a scoped constant name" do
ConstantSpecs.const_defined?("ClassC::CS_CONST1").should be_true
end
it "returns true when passed a scoped constant name for a constant in the inheritance hierarchy and the inherited flag is default" do
ConstantSpecs::ClassD.const_defined?("ClassE::CS_CONST2").should be_true
end
it "returns true when passed a scoped constant name for a constant in the inheritance hierarchy and the inherited flag is true" do
ConstantSpecs::ClassD.const_defined?("ClassE::CS_CONST2", true).should be_true
end
it "returns false when passed a scoped constant name for a constant in the inheritance hierarchy and the inherited flag is false" do
ConstantSpecs::ClassD.const_defined?("ClassE::CS_CONST2", false).should be_false
end
it "returns false when the name begins with '::' and the toplevel constant does not exist" do
ConstantSpecs.const_defined?("::Name").should be_false
end
it "raises a NameError if the name does not start with a capital letter" do
-> { ConstantSpecs.const_defined? "name" }.should raise_error(NameError)
end
it "raises a NameError if the name starts with '_'" do
-> { ConstantSpecs.const_defined? "__CONSTX__" }.should raise_error(NameError)
end
it "raises a NameError if the name starts with '@'" do
-> { ConstantSpecs.const_defined? "@Name" }.should raise_error(NameError)
end
it "raises a NameError if the name starts with '!'" do
-> { ConstantSpecs.const_defined? "!Name" }.should raise_error(NameError)
end
it "returns true or false for the nested name" do
ConstantSpecs.const_defined?("NotExist::Name").should == false
ConstantSpecs.const_defined?("::Name").should == false
ConstantSpecs.const_defined?("::Object").should == true
ConstantSpecs.const_defined?("ClassA::CS_CONST10").should == true
ConstantSpecs.const_defined?("ClassA::CS_CONST10_").should == false
end
it "raises a NameError if the name contains non-alphabetic characters except '_'" do
ConstantSpecs.const_defined?("CS_CONSTX").should == false
-> { ConstantSpecs.const_defined? "Name=" }.should raise_error(NameError)
-> { ConstantSpecs.const_defined? "Name?" }.should raise_error(NameError)
end
it "raises a TypeError if conversion to a String by calling #to_str fails" do
name = mock('123')
-> { ConstantSpecs.const_defined? name }.should raise_error(TypeError)
name.should_receive(:to_str).and_return(123)
-> { ConstantSpecs.const_defined? name }.should raise_error(TypeError)
end
end
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