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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe PDF::Core::Stream do
subject(:stream) { described_class.new }
it 'compresses a stream upon request' do
stream << ('Hi There ' * 20)
cstream = described_class.new
cstream << ('Hi There ' * 20)
cstream.compress!
expect(cstream.filtered_stream.length).to be < stream.length
expect(cstream.data[:Filter]).to eq [:FlateDecode]
end
it 'exposes compression state' do
stream << 'Hello'
stream.compress!
expect(stream).to be_compressed
end
it 'detects from filters if stream is compressed' do
stream << 'Hello'
stream.filters << :FlateDecode
expect(stream).to be_compressed
end
it 'has Length if in data' do
stream << 'hello'
expect(stream.data[:Length]).to eq 5
end
it 'updates Length when updated' do
stream << 'hello'
expect(stream.data[:Length]).to eq 5
stream << ' world'
expect(stream.data[:Length]).to eq 11
end
it 'corecly handles decode params' do
stream << 'Hello'
stream.filters << { FlateDecode: { Predictor: 15 } }
expect(stream.data[:DecodeParms]).to eq [Predictor: 15]
end
end
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