to_set_spec.rb

require_relative '../../spec_helper'
require_relative '../enumerable/fixtures/classes'

describe "Range#to_set" do
  it "returns a new Set created from self" do
    (1..4).to_set.should == Set[1, 2, 3, 4]
    (1...4).to_set.should == Set[1, 2, 3]
  end

  it "passes down passed blocks" do
    (1..3).to_set { |x| x * x }.should == Set[1, 4, 9]
  end

  it "raises a TypeError for a beginningless range" do
    -> {
      (..0).to_set
    }.should raise_error(TypeError, "can't iterate from NilClass")
  end

  ruby_version_is "4.0" do
    it "raises a RangeError if the range is endless" do
      -> { (1..).to_set }.should raise_error(RangeError, "cannot convert endless range to a set")
      -> { (1...).to_set }.should raise_error(RangeError, "cannot convert endless range to a set")
    end
  end

  context "given positional arguments" do
    ruby_version_is ""..."4.0" do
      it "instantiates an object of provided as the first argument set class" do
        set = (1..3).to_set(EnumerableSpecs::SetSubclass)
        set.should be_kind_of(EnumerableSpecs::SetSubclass)
        set.to_a.sort.should == [1, 2, 3]
      end
    end

    ruby_version_is "4.0"..."4.1" do
      it "instantiates an object of provided as the first argument set class and warns" do
        -> {
          set = (1..3).to_set(EnumerableSpecs::SetSubclass)
          set.should be_kind_of(EnumerableSpecs::SetSubclass)
          set.to_a.sort.should == [1, 2, 3]
        }.should complain(/warning: passing arguments to Enumerable#to_set is deprecated/)
      end
    end

    ruby_version_is "4.1" do
      it "does not accept any positional argument" do
        -> {
          (1..3).to_set(EnumerableSpecs::SetSubclass)
        }.should raise_error(ArgumentError, "wrong number of arguments (given 1, expected 0)")
      end
    end
  end
end