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# frozen_string_literal: true
RSpec.describe HTTP::FormData::CompositeIO do
subject(:composite_io) { HTTP::FormData::CompositeIO.new(ios) }
let(:ios) { ["Hello", " ", "", "world", "!"].map { |s| StringIO.new(s) } }
describe "#initialize" do
it "accepts IOs and strings" do
io = HTTP::FormData::CompositeIO.new(["Hello ", StringIO.new("world!")])
expect(io.read).to eq "Hello world!"
end
it "fails if an IO is neither a String nor an IO" do
expect { HTTP::FormData::CompositeIO.new %i[hello world] }
.to raise_error(ArgumentError)
end
end
describe "#read" do
it "reads all data" do
expect(composite_io.read).to eq "Hello world!"
end
it "reads partial data" do
expect(composite_io.read(3)).to eq "Hel"
expect(composite_io.read(2)).to eq "lo"
expect(composite_io.read(1)).to eq " "
expect(composite_io.read(6)).to eq "world!"
end
it "returns empty string when no data was retrieved" do
composite_io.read
expect(composite_io.read).to eq ""
end
it "returns nil when no partial data was retrieved" do
composite_io.read
expect(composite_io.read(3)).to eq nil
end
it "reads partial data with a buffer" do
outbuf = String.new
expect(composite_io.read(3, outbuf)).to eq "Hel"
expect(composite_io.read(2, outbuf)).to eq "lo"
expect(composite_io.read(1, outbuf)).to eq " "
expect(composite_io.read(6, outbuf)).to eq "world!"
end
it "fills the buffer with retrieved content" do
outbuf = String.new
composite_io.read(3, outbuf)
expect(outbuf).to eq "Hel"
composite_io.read(2, outbuf)
expect(outbuf).to eq "lo"
composite_io.read(1, outbuf)
expect(outbuf).to eq " "
composite_io.read(6, outbuf)
expect(outbuf).to eq "world!"
end
it "returns nil when no partial data was retrieved with a buffer" do
outbuf = String.new("content")
composite_io.read
expect(composite_io.read(3, outbuf)).to eq nil
expect(outbuf).to eq ""
end
it "returns data in binary encoding" do
io = HTTP::FormData::CompositeIO.new(%w[Janko Marohnić])
expect(io.read(5).encoding).to eq Encoding::BINARY
expect(io.read(9).encoding).to eq Encoding::BINARY
io.rewind
expect(io.read.encoding).to eq Encoding::BINARY
expect(io.read.encoding).to eq Encoding::BINARY
end
it "reads data in bytes" do
emoji = "😃"
io = HTTP::FormData::CompositeIO.new([emoji])
expect(io.read(1)).to eq emoji.b[0]
expect(io.read(1)).to eq emoji.b[1]
expect(io.read(1)).to eq emoji.b[2]
expect(io.read(1)).to eq emoji.b[3]
end
end
describe "#rewind" do
it "rewinds all IOs" do
composite_io.read
composite_io.rewind
expect(composite_io.read).to eq "Hello world!"
end
end
describe "#size" do
it "returns sum of all IO sizes" do
expect(composite_io.size).to eq 12
end
it "returns 0 when there are no IOs" do
empty_composite_io = HTTP::FormData::CompositeIO.new []
expect(empty_composite_io.size).to eq 0
end
end
end
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