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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
ruby_version_is "" ... "1.9" do
it "raises a TypeError when passed a frozen String in truncate mode as StringIO backend" do
lambda { StringIO.open("example".freeze, IO::TRUNC) }.should raise_error(TypeError)
end
end
ruby_version_is "1.9" do
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
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 { io = StringIO.open(str, "r+") }.should raise_error(Errno::EACCES)
lambda { io = StringIO.open(str, "w") }.should raise_error(Errno::EACCES)
lambda { io = 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
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