Use 64 bit shift when convert uint64_t to ByteVector

components/rappor/byte_vector_utils_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/rappor/byte_vector_utils.h"
 
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace rappor {
 
 namespace {
 
 class SecondRequest : public HmacByteVectorGenerator {
  public:
   SecondRequest(const HmacByteVectorGenerator& first_request)
       : HmacByteVectorGenerator(first_request) {}
 };
 
 std::string HexToString(const char* hex) {
   ByteVector bv;
   base::HexStringToBytes(hex, &bv);
   return std::string(bv.begin(), bv.end());
 }
 
 }  // namespace
 
+TEST(ByteVectorTest, Uint64ToByteVectorSmall) {
+  ByteVector bytes(1);
+  Uint64ToByteVector(0x10, 1, &bytes);
+  EXPECT_EQ(1u, bytes.size());
+  EXPECT_EQ(0x10, bytes[0]);
+}
+
+TEST(ByteVectorTest, Uint64ToByteVectorLarge) {
+  ByteVector bytes(8);
+  Uint64ToByteVector(0xfedcba9876543210, 8, &bytes);
+  EXPECT_EQ(8u, bytes.size());
+  EXPECT_EQ(0x10, bytes[0]);
+  EXPECT_EQ(0xfe, bytes[7]);
+}
+
 TEST(ByteVectorTest, ByteVectorAnd) {
   ByteVector lhs(2);
   lhs[1] = 0x12;
   ByteVector rhs(2);
   rhs[1] = 0x03;
 
   EXPECT_EQ(0x02, (*ByteVectorAnd(lhs, &rhs))[1]);
 }
 
 TEST(ByteVectorTest, ByteVectorOr) {
@@ skipping 89 matching lines @@
   HmacByteVectorGenerator generator(50u,
       HmacByteVectorGenerator::GenerateEntropyInput(), "");
   ByteVector random = generator.GetWeightedRandomByteVector(PROBABILITY_75);
   int bit_count = CountBits(random);
   // Check bounds on bit counts that are true with 99.999% probability.
   EXPECT_GT(bit_count, 259); // Binomial(400, .75) CDF(259) ~= 0.000003
   EXPECT_LE(bit_count, 337); // Binomial(400, .75) CDF(337) ~= 0.999997
 }
 
 }  // namespace rappor