spec/ruby/core/dir/fchdir_spec.rb


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

platform_is_not :windows do
  describe "Dir.fchdir" do
    before :all do
      DirSpecs.create_mock_dirs
    end

    after :all do
      DirSpecs.delete_mock_dirs
    end

    before :each do
      @original = Dir.pwd
    end

    after :each do
      Dir.chdir(@original)
    end

    it "changes the current working directory to the directory specified by the integer file descriptor" do
      dir = Dir.new(DirSpecs.mock_dir)
      Dir.fchdir dir.fileno
      Dir.pwd.should == DirSpecs.mock_dir
    ensure
      dir.close
    end

    it "returns 0 when successfully changing directory" do
      dir = Dir.new(DirSpecs.mock_dir)
      Dir.fchdir(dir.fileno).should == 0
    ensure
      dir.close
    end

    it "returns the value of the block when a block is given" do
      dir = Dir.new(DirSpecs.mock_dir)
      Dir.fchdir(dir.fileno) { :block_value }.should == :block_value
    ensure
      dir.close
    end

    it "changes to the specified directory for the duration of the block" do
      dir = Dir.new(DirSpecs.mock_dir)
      Dir.fchdir(dir.fileno) { Dir.pwd }.should == DirSpecs.mock_dir
      Dir.pwd.should == @original
    ensure
      dir.close
    end

    it "raises a SystemCallError if the file descriptor given is not valid" do
      -> { Dir.fchdir(-1) }.should.raise(SystemCallError, "Bad file descriptor - fchdir")
      -> { Dir.fchdir(-1) { } }.should.raise(SystemCallError, "Bad file descriptor - fchdir")
    end

    it "raises a SystemCallError if the file descriptor given is not for a directory" do
      -> { Dir.fchdir $stdout.fileno }.should.raise(SystemCallError, /(Not a directory|Invalid argument) - fchdir/)
      -> { Dir.fchdir($stdout.fileno) { } }.should.raise(SystemCallError, /(Not a directory|Invalid argument) - fchdir/)
    end
  end
end

platform_is :windows do
  describe "Dir.fchdir" do
    it "raises NotImplementedError" do
      -> { Dir.fchdir 1 }.should.raise(NotImplementedError)
      -> { Dir.fchdir(1) { } }.should.raise(NotImplementedError)
    end
  end
end