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require 'stringio'
require 'rack/rewindable_input'
shared "a rewindable IO object" do
before do
@rio = Rack::RewindableInput.new(@io)
end
should "be able to handle to read()" do
@rio.read.should.equal "hello world"
end
should "be able to handle to read(nil)" do
@rio.read(nil).should.equal "hello world"
end
should "be able to handle to read(length)" do
@rio.read(1).should.equal "h"
end
should "be able to handle to read(length, buffer)" do
buffer = ""
result = @rio.read(1, buffer)
result.should.equal "h"
result.object_id.should.equal buffer.object_id
end
should "be able to handle to read(nil, buffer)" do
buffer = ""
result = @rio.read(nil, buffer)
result.should.equal "hello world"
result.object_id.should.equal buffer.object_id
end
should "rewind to the beginning when #rewind is called" do
@rio.read(1)
@rio.rewind
@rio.read.should.equal "hello world"
end
should "be able to handle gets" do
@rio.gets.should == "hello world"
end
should "be able to handle each" do
array = []
@rio.each do |data|
array << data
end
array.should.equal(["hello world"])
end
should "not buffer into a Tempfile if no data has been read yet" do
@rio.instance_variable_get(:@rewindable_io).should.be.nil
end
should "buffer into a Tempfile when data has been consumed for the first time" do
@rio.read(1)
tempfile = @rio.instance_variable_get(:@rewindable_io)
tempfile.should.not.be.nil
@rio.read(1)
tempfile2 = @rio.instance_variable_get(:@rewindable_io)
tempfile2.path.should == tempfile.path
end
should "close the underlying tempfile upon calling #close" do
@rio.read(1)
tempfile = @rio.instance_variable_get(:@rewindable_io)
@rio.close
tempfile.should.be.closed
end
should "be possible to call #close when no data has been buffered yet" do
lambda{ @rio.close }.should.not.raise
end
should "be possible to call #close multiple times" do
lambda{
@rio.close
@rio.close
}.should.not.raise
end
@rio.close
@rio = nil
end
describe Rack::RewindableInput do
describe "given an IO object that is already rewindable" do
before do
@io = StringIO.new("hello world")
end
behaves_like "a rewindable IO object"
end
describe "given an IO object that is not rewindable" do
before do
@io = StringIO.new("hello world")
@io.instance_eval do
undef :rewind
end
end
behaves_like "a rewindable IO object"
end
describe "given an IO object whose rewind method raises Errno::ESPIPE" do
before do
@io = StringIO.new("hello world")
def @io.rewind
raise Errno::ESPIPE, "You can't rewind this!"
end
end
behaves_like "a rewindable IO object"
end
end
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