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# frozen_string_literal: true
require "abstract_unit"
require "active_support/core_ext/object/blank"
class GzipTest < ActiveSupport::TestCase
def test_compress_should_decompress_to_the_same_value
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World"))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", Zlib::NO_COMPRESSION))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", Zlib::BEST_SPEED))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", Zlib::BEST_COMPRESSION))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", nil, Zlib::FILTERED))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", nil, Zlib::HUFFMAN_ONLY))
assert_equal "Hello World", ActiveSupport::Gzip.decompress(ActiveSupport::Gzip.compress("Hello World", nil, nil))
end
def test_compress_should_return_a_binary_string
compressed = ActiveSupport::Gzip.compress("")
assert_equal Encoding.find("binary"), compressed.encoding
assert_not compressed.blank?, "a compressed blank string should not be blank"
end
def test_compress_should_return_gzipped_string_by_compression_level
source_string = "Hello World" * 100
gzipped_by_speed = ActiveSupport::Gzip.compress(source_string, Zlib::BEST_SPEED)
assert_equal 1, Zlib::GzipReader.new(StringIO.new(gzipped_by_speed)).level
gzipped_by_best_compression = ActiveSupport::Gzip.compress(source_string, Zlib::BEST_COMPRESSION)
assert_equal 9, Zlib::GzipReader.new(StringIO.new(gzipped_by_best_compression)).level
assert_equal true, (gzipped_by_best_compression.bytesize < gzipped_by_speed.bytesize)
end
def test_decompress_checks_crc
compressed = ActiveSupport::Gzip.compress("Hello World")
first_crc_byte_index = compressed.bytesize - 8
compressed.setbyte(first_crc_byte_index, compressed.getbyte(first_crc_byte_index) ^ 0xff)
assert_raises(Zlib::GzipFile::CRCError) do
ActiveSupport::Gzip.decompress(compressed)
end
end
end
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