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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/using', __FILE__)
describe "Module#using" do
it "imports class refinements from module into the current class/module" do
refinement = Module.new do
refine Integer do
def foo; "foo"; end
end
end
result = nil
Module.new do
using refinement
result = 1.foo
end
result.should == "foo"
end
it "accepts module as argument" do
refinement = Module.new do
refine Integer do
def foo; "foo"; end
end
end
-> () {
Module.new do
using refinement
end
}.should_not raise_error
end
it "accepts module without refinements" do
mod = Module.new
-> () {
Module.new do
using mod
end
}.should_not raise_error
end
it "does not accept class" do
klass = Class.new
-> () {
Module.new do
using klass
end
}.should raise_error(TypeError)
end
it "raises TypeError if passed something other than module" do
-> () {
Module.new do
using "foo"
end
}.should raise_error(TypeError)
end
it "returns self" do
refinement = Module.new
result = nil
mod = Module.new do
result = using refinement
end
result.should equal(mod)
end
it "works in classes too" do
refinement = Module.new do
refine Integer do
def foo; "foo"; end
end
end
result = nil
Class.new do
using refinement
result = 1.foo
end
result.should == "foo"
end
it "raises error in method scope" do
mod = Module.new do
def self.foo
using ModuleSpecs::EmptyRefinement
end
end
-> () {
mod.foo
}.should raise_error(RuntimeError, /Module#using is not permitted in methods/)
end
it "activates refinement even for existed objects" do
result = nil
Module.new do
klass = Class.new do
def foo; "foo"; end
end
refinement = Module.new do
refine klass do
def foo; "foo from refinement"; end
end
end
obj = klass.new
using refinement
result = obj.foo
end
result.should == "foo from refinement"
end
it "activates updates when refinement reopens later" do
result = nil
Module.new do
klass = Class.new do
def foo; "foo"; end
end
refinement = Module.new do
refine klass do
def foo; "foo from refinement"; end
end
end
using refinement
refinement.class_eval do
refine klass do
def foo; "foo from reopened refinement"; end
end
end
obj = klass.new
result = obj.foo
end
result.should == "foo from reopened refinement"
end
describe "scope of refinement" do
it "is active until the end of current class/module" do
ScratchPad.record []
Module.new do
Class.new do
using ModuleSpecs::RefinementForStringToS
ScratchPad << "1".to_s
end
ScratchPad << "1".to_s
end
ScratchPad.recorded.should == ["hello from refinement", "1"]
end
# Refinements are lexical in scope.
# Refinements are only active within a scope after the call to using.
# Any code before the using statement will not have the refinement activated.
it "is not active before the `using` call" do
ScratchPad.record []
Module.new do
Class.new do
ScratchPad << "1".to_s
using ModuleSpecs::RefinementForStringToS
ScratchPad << "1".to_s
end
end
ScratchPad.recorded.should == ["1", "hello from refinement"]
end
# If you call a method that is defined outside the current scope
# the refinement will be deactivated
it "is not active for code defined outside the current scope" do
result = nil
Module.new do
klass = Class.new do
def foo; "foo"; end
end
refinement = Module.new do
refine klass do
def foo; "foo from refinement"; end
end
end
def self.call_foo(c)
c.foo
end
using refinement
result = call_foo(klass.new)
end
result.should == "foo"
end
# If a method is defined in a scope where a refinement is active
# the refinement will be active when the method is called.
it "is active for method defined in a scope wherever it's called" do
klass = Class.new do
def foo; "foo"; end
end
mod = Module.new do
refinement = Module.new do
refine klass do
def foo; "foo from refinement"; end
end
end
using refinement
def self.call_foo(c)
c.foo
end
end
c = klass.new
mod.call_foo(c).should == "foo from refinement"
end
it "is not active if `using` call is not evaluated" do
result = nil
Module.new do
if false
using ModuleSpecs::RefinementForStringToS
end
result = "1".to_s
end
result.should == "1"
end
# The refinements in module are not activated automatically
# if the class is reopened later
it "is not active when class/module reopens" do
refinement = Module.new do
refine String do
def to_s
"hello from refinement"
end
end
end
result = []
klass = Class.new do
using refinement
result << "1".to_s
end
klass.class_eval do
result << "1".to_s
end
result.should == ["hello from refinement", "1"]
end
end
end
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