require_relative '../../spec_helper'
require_relative 'fixtures/common'

describe "Dir.each_child" do
  before :all do
    DirSpecs.create_mock_dirs
  end

  after :all do
    DirSpecs.delete_mock_dirs
  end

  it "yields all names in an existing directory to the provided block" do
    a, b = [], []

    Dir.each_child(DirSpecs.mock_dir) {|f| a << f}
    Dir.each_child("#{DirSpecs.mock_dir}/deeply/nested") {|f| b << f}

    a.sort.should == DirSpecs.expected_paths -  %w[. ..]
    b.sort.should == %w|.dotfile.ext directory|
  end

  it "returns nil when successful" do
    Dir.each_child(DirSpecs.mock_dir) {|f| f}.should == nil
  end

  it "calls #to_path on non-String arguments" do
    p = mock('path')
    p.should_receive(:to_path).and_return(DirSpecs.mock_dir)
    Dir.each_child(p).to_a
  end

  it "raises a SystemCallError if passed a nonexistent directory" do
    -> { Dir.each_child(DirSpecs.nonexistent) {} }.should raise_error(SystemCallError)
  end

  describe "when no block is given" do
    it "returns an Enumerator" do
      Dir.each_child(DirSpecs.mock_dir).should be_an_instance_of(Enumerator)
      Dir.each_child(DirSpecs.mock_dir).to_a.sort.should == DirSpecs.expected_paths - %w[. ..]
    end

    describe "returned Enumerator" do
      describe "size" do
        it "should return nil" do
          Dir.each_child(DirSpecs.mock_dir).size.should == nil
        end
      end
    end
  end
end

ruby_version_is "2.6" do
  describe "Dir#each_child" do
    before :all do
      DirSpecs.create_mock_dirs
    end

    after :all do
      DirSpecs.delete_mock_dirs
    end

    after :each do
      @dir.close if @dir
    end

    it "yields all names in an existing directory to the provided block" do
      a, b = [], []
      @dir = Dir.new(DirSpecs.mock_dir)
      @dir2 = Dir.new("#{DirSpecs.mock_dir}/deeply/nested")

      @dir.each_child { |f| a << f }
      @dir2.each_child { |f| b << f }
      @dir2.close

      a.sort.should == DirSpecs.expected_paths - %w|. ..|
      b.sort.should == %w|.dotfile.ext directory|
    end

    it "returns self when successful" do
      @dir = Dir.new(DirSpecs.mock_dir)
      @dir.each_child { |f| f }.should == @dir
    end

    describe "when no block is given" do
      it "returns an Enumerator" do
        @dir = Dir.new(DirSpecs.mock_dir)

        @dir.each_child.should be_an_instance_of(Enumerator)
        @dir.each_child.to_a.sort.should == DirSpecs.expected_paths - %w|. ..|
      end

      describe "returned Enumerator" do
        describe "size" do
          it "should return nil" do
            @dir = Dir.new(DirSpecs.mock_dir)
            @dir.each_child.size.should == nil
          end
        end
      end
    end
  end
end