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require File.expand_path('../../../spec_helper', __FILE__)
require 'stringio'
describe "StringIO#initialize when passed [Object, mode]" do
before :each do
@io = StringIO.allocate
end
it "uses the passed Object as the StringIO backend" do
@io.send(:initialize, str = "example", "r")
@io.string.should equal(str)
end
it "sets the mode based on the passed mode" do
io = StringIO.allocate
io.send(:initialize, "example", "r")
io.closed_read?.should be_false
io.closed_write?.should be_true
io = StringIO.allocate
io.send(:initialize, "example", "rb")
io.closed_read?.should be_false
io.closed_write?.should be_true
io = StringIO.allocate
io.send(:initialize, "example", "r+")
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "rb+")
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "w")
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "wb")
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "w+")
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "wb+")
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "a")
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "ab")
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", "a+")
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "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.allocate
io.send(:initialize, "example", IO::RDONLY)
io.closed_read?.should be_false
io.closed_write?.should be_true
io = StringIO.allocate
io.send(:initialize, "example", IO::RDWR)
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", IO::WRONLY)
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", IO::WRONLY | IO::TRUNC)
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", IO::RDWR | IO::TRUNC)
io.closed_read?.should be_false
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "example", IO::WRONLY | IO::APPEND)
io.closed_read?.should be_true
io.closed_write?.should be_false
io = StringIO.allocate
io.send(:initialize, "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
io = StringIO.allocate
lambda { io.send(:initialize, "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.send(:initialize, "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.send(:initialize, str, "r+") }.should raise_error(Errno::EACCES)
lambda { @io.send(:initialize, str, "w") }.should raise_error(Errno::EACCES)
lambda { @io.send(:initialize, str, "a") }.should raise_error(Errno::EACCES)
end
end
describe "StringIO#initialize when passed [Object]" do
before :each do
@io = StringIO.allocate
end
it "uses the passed Object as the StringIO backend" do
@io.send(:initialize, str = "example")
@io.string.should equal(str)
end
it "sets the mode to read-write" do
@io.send(:initialize, "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.send(:initialize, obj)
@io.string.should == "example"
end
it "automatically sets the mode to read-only when passed a frozen string" do
(str = "example").freeze
@io.send(:initialize, str)
@io.closed_read?.should be_false
@io.closed_write?.should be_true
end
end
describe "StringIO#initialize when passed no arguments" do
before :each do
@io = StringIO.allocate
end
it "is private" do
StringIO.should have_private_instance_method(:initialize)
end
it "sets the mode to read-write" do
@io.send(:initialize, "example")
@io.closed_read?.should be_false
@io.closed_write?.should be_false
end
it "uses an empty String as the StringIO backend" do
@io.send(:initialize)
@io.string.should == ""
end
end
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