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require_relative '../../spec_helper'
describe "Symbol#to_proc" do
it "returns a new Proc" do
proc = :to_s.to_proc
proc.should be_kind_of(Proc)
end
it "sends self to arguments passed when calling #call on the Proc" do
obj = mock("Receiving #to_s")
obj.should_receive(:to_s).and_return("Received #to_s")
:to_s.to_proc.call(obj).should == "Received #to_s"
end
it "returns a Proc with #lambda? true" do
pr = :to_s.to_proc
pr.should.lambda?
end
it "produces a Proc with arity -2" do
pr = :to_s.to_proc
pr.arity.should == -2
end
it "produces a Proc that always returns [[:req], [:rest]] for #parameters" do
pr = :to_s.to_proc
pr.parameters.should == [[:req], [:rest]]
end
ruby_version_is "3.2" do
it "only calls public methods" do
body = proc do
public def pub; @a << :pub end
protected def pro; @a << :pro end
private def pri; @a << :pri end
attr_reader :a
end
@a = []
singleton_class.class_eval(&body)
tap(&:pub)
proc{tap(&:pro)}.should raise_error(NoMethodError, /protected method [`']pro' called/)
proc{tap(&:pri)}.should raise_error(NoMethodError, /private method [`']pri' called/)
@a.should == [:pub]
@a = []
c = Class.new(&body)
o = c.new
o.instance_variable_set(:@a, [])
o.tap(&:pub)
proc{tap(&:pro)}.should raise_error(NoMethodError, /protected method [`']pro' called/)
proc{o.tap(&:pri)}.should raise_error(NoMethodError, /private method [`']pri' called/)
o.a.should == [:pub]
end
end
it "raises an ArgumentError when calling #call on the Proc without receiver" do
-> {
:object_id.to_proc.call
}.should raise_error(ArgumentError, /no receiver given|wrong number of arguments \(given 0, expected 1\+\)/)
end
it "passes along the block passed to Proc#call" do
klass = Class.new do
def m
yield
end
def to_proc
:m.to_proc.call(self) { :value }
end
end
klass.new.to_proc.should == :value
end
it "produces a proc with source location nil" do
pr = :to_s.to_proc
pr.source_location.should == nil
end
end
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