require_relative '../../spec_helper'

describe "Regexp.try_convert" do
  not_supported_on :opal do
    it "returns the argument if given a Regexp" do
      Regexp.try_convert(/foo/s).should == /foo/s
    end
  end

  it "returns nil if given an argument that can't be converted to a Regexp" do
    ['', 'glark', [], Object.new, :pat].each do |arg|
      Regexp.try_convert(arg).should be_nil
    end
  end

  it "tries to coerce the argument by calling #to_regexp" do
    rex = mock('regexp')
    rex.should_receive(:to_regexp).and_return(/(p(a)t[e]rn)/)
    Regexp.try_convert(rex).should == /(p(a)t[e]rn)/
  end

  it "raises a TypeError if the object does not return an Regexp from #to_regexp" do
    obj = mock("regexp")
    obj.should_receive(:to_regexp).and_return("string")
    -> { Regexp.try_convert(obj) }.should raise_error(TypeError, "can't convert MockObject to Regexp (MockObject#to_regexp gives String)")
  end
end