require File.expand_path('../../../spec_helper', __FILE__) require 'stringio' describe "StringIO.open when passed [Object, mode]" do it "uses the passed Object as the StringIO backend" do io = StringIO.open(str = "example", "r") io.string.should equal(str) end it "returns the blocks return value when yielding" do ret = StringIO.open("example", "r") { :test } ret.should equal(:test) end it "yields self to the passed block" do io = nil StringIO.open("example", "r") { |strio| io = strio } io.should be_kind_of(StringIO) end it "closes self after yielding" do io = nil StringIO.open("example", "r") { |strio| io = strio } io.closed?.should be_true end it "even closes self when an exception is raised while yielding" do io = nil begin StringIO.open("example", "r") do |strio| io = strio raise "Error" end rescue end io.closed?.should be_true end it "sets self's string to nil after yielding" do io = nil StringIO.open("example", "r") { |strio| io = strio } io.string.should be_nil end it "even sets self's string to nil when an exception is raised while yielding" do io = nil begin StringIO.open("example", "r") do |strio| io = strio raise "Error" end rescue end io.string.should be_nil end it "sets the mode based on the passed mode" do io = StringIO.open("example", "r") io.closed_read?.should be_false io.closed_write?.should be_true io = StringIO.open("example", "rb") io.closed_read?.should be_false io.closed_write?.should be_true io = StringIO.open("example", "r+") io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", "rb+") io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", "w") io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", "wb") io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", "w+") io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", "wb+") io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", "a") io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", "ab") io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", "a+") io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", "ab+") io.closed_read?.should be_false io.closed_write?.should be_false end it "allows passing the mode as an Integer" do io = StringIO.open("example", IO::RDONLY) io.closed_read?.should be_false io.closed_write?.should be_true io = StringIO.open("example", IO::RDWR) io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", IO::WRONLY) io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", IO::WRONLY | IO::TRUNC) io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", IO::RDWR | IO::TRUNC) io.closed_read?.should be_false io.closed_write?.should be_false io = StringIO.open("example", IO::WRONLY | IO::APPEND) io.closed_read?.should be_true io.closed_write?.should be_false io = StringIO.open("example", IO::RDWR | IO::APPEND) io.closed_read?.should be_false io.closed_write?.should be_false end it "raises a RuntimeError when passed a frozen String in truncate mode as StringIO backend" do lambda { StringIO.open("example".freeze, IO::TRUNC) }.should raise_error(RuntimeError) end it "tries to convert the passed mode to a String using #to_str" do obj = mock('to_str') obj.should_receive(:to_str).and_return("r") io = StringIO.open("example", obj) io.closed_read?.should be_false io.closed_write?.should be_true end it "raises an Errno::EACCES error when passed a frozen string with a write-mode" do (str = "example").freeze lambda { StringIO.open(str, "r+") }.should raise_error(Errno::EACCES) lambda { StringIO.open(str, "w") }.should raise_error(Errno::EACCES) lambda { StringIO.open(str, "a") }.should raise_error(Errno::EACCES) end end describe "StringIO.open when passed [Object]" do it "uses the passed Object as the StringIO backend" do io = StringIO.open(str = "example") io.string.should equal(str) end it "yields self to the passed block" do io = nil ret = StringIO.open("example") { |strio| io = strio } io.should equal(ret) end it "sets the mode to read-write" do io = StringIO.open("example") io.closed_read?.should be_false io.closed_write?.should be_false end it "tries to convert the passed Object to a String using #to_str" do obj = mock('to_str') obj.should_receive(:to_str).and_return("example") io = StringIO.open(obj) io.string.should == "example" end it "automatically sets the mode to read-only when passed a frozen string" do (str = "example").freeze io = StringIO.open(str) io.closed_read?.should be_false io.closed_write?.should be_true end end describe "StringIO.open when passed no arguments" do it "yields self to the passed block" do io = nil ret = StringIO.open { |strio| io = strio } io.should equal(ret) end it "sets the mode to read-write" do io = StringIO.open io.closed_read?.should be_false io.closed_write?.should be_false end it "uses an empty String as the StringIO backend" do StringIO.open.string.should == "" end end