src/storage/louds/bit_stream_test.cc

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#include "storage/louds/bit_stream.h"

#include "testing/base/public/gunit.h"

namespace {

using ::mozc::storage::louds::BitStream;

class BitStreamTest : public ::testing::Test {
};

TEST_F(BitStreamTest, Pattern1) {
  BitStream bit_stream;
  for (int i = 0; i < 128; ++i) {
    bit_stream.PushBit(0);
    bit_stream.PushBit(1);
    EXPECT_EQ(2 * (i + 1), bit_stream.num_bits());
    EXPECT_EQ(i / 4 + 1, bit_stream.ByteSize());
  }

  EXPECT_EQ(string(32, '\xAA'), bit_stream.image());
}

TEST_F(BitStreamTest, Pattern2) {
  BitStream bit_stream;
  for (int i = 0; i < 128; ++i) {
    bit_stream.PushBit(0);
    bit_stream.PushBit(0);
    bit_stream.PushBit(1);
    bit_stream.PushBit(1);
    EXPECT_EQ(4 * (i + 1), bit_stream.num_bits());
    EXPECT_EQ(i / 2 + 1, bit_stream.ByteSize());
  }

  EXPECT_EQ(string(64, '\xCC'), bit_stream.image());
}

TEST_F(BitStreamTest, FillPadding32) {
  BitStream bit_stream;

  bit_stream.FillPadding32();
  EXPECT_EQ("", bit_stream.image());

  bit_stream.PushBit(1);
  bit_stream.FillPadding32();
  EXPECT_EQ(string("\x01\x00\x00\x00", 4), bit_stream.image());
}

}  // namespace