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require 'test_helper'
class DeflaterTest < MiniTest::Test
include CrcTest
DEFLATER_TEST_FILE = 'test/data/generated/deflatertest.bin'
BEST_COMP_FILE = 'test/data/generated/compressiontest_best_compression.bin'
DEFAULT_COMP_FILE = 'test/data/generated/compressiontest_default_compression.bin'
NO_COMP_FILE = 'test/data/generated/compressiontest_no_compression.bin'
def test_output_operator
txt = load_file('test/data/file2.txt')
deflate(txt, DEFLATER_TEST_FILE)
inflated_txt = inflate(DEFLATER_TEST_FILE)
assert_equal(txt, inflated_txt)
end
def test_default_compression
txt = load_file('test/data/file2.txt')
Zip.default_compression = ::Zlib::BEST_COMPRESSION
deflate(txt, BEST_COMP_FILE)
Zip.default_compression = ::Zlib::DEFAULT_COMPRESSION
deflate(txt, DEFAULT_COMP_FILE)
Zip.default_compression = ::Zlib::NO_COMPRESSION
deflate(txt, NO_COMP_FILE)
best = File.size(BEST_COMP_FILE)
default = File.size(DEFAULT_COMP_FILE)
no = File.size(NO_COMP_FILE)
assert(best < default)
assert(best < no)
assert(default < no)
end
def test_data_error
assert_raises(::Zip::DecompressionError) do
inflate('test/data/file1.txt.corrupt.deflatedData')
end
end
private
def load_file(filename)
File.open(filename, 'rb', &:read)
end
def deflate(data, filename)
File.open(filename, 'wb') do |file|
deflater = ::Zip::Deflater.new(file)
deflater << data
deflater.finish
assert_equal(deflater.size, data.size)
file << 'trailing data for zlib with -MAX_WBITS'
end
end
def inflate(filename)
File.open(filename, 'rb') do |file|
inflater = ::Zip::Inflater.new(file)
inflater.read
end
end
def test_crc
run_crc_test(::Zip::Deflater)
end
end
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