Add base::UnguessableToken

base/unguessable_token_unittest.cc

Index: base/unguessable_token_unittest.cc
diff --git a/base/unguessable_token_unittest.cc b/base/unguessable_token_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..02a2ce6fc56bb3051e0ff3d4ff0cb3aaa7e3c574
--- /dev/null
+++ b/base/unguessable_token_unittest.cc
@@ -0,0 +1,106 @@
+// Copyright (c) 2016 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 "base/unguessable_token.h"
+
+#include <type_traits>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+
+void TestSmallerThanOperator(const UnguessableToken& a,
+                             const UnguessableToken& b) {
+  EXPECT_TRUE(a < b);
+  EXPECT_FALSE(b < a);
+}
+
+TEST(UnguessableTokenTest, VerifyEqualityOperators) {
+  // Deserialize is used for testing purposes.
+  // Use UnguessableToken::Create() in production code instead.
+  UnguessableToken token = UnguessableToken::Deserialize(1, 2);
+  UnguessableToken same_token = UnguessableToken::Deserialize(1, 2);
+  UnguessableToken diff_token = UnguessableToken::Deserialize(1, 3);
+
+  EXPECT_TRUE(token == token);
+  EXPECT_FALSE(token != token);
+
+  EXPECT_TRUE(token == same_token);
+  EXPECT_FALSE(token != same_token);
+
+  EXPECT_FALSE(token == diff_token);
+  EXPECT_FALSE(diff_token == token);
+  EXPECT_TRUE(token != diff_token);
+  EXPECT_TRUE(diff_token != token);
+}
+
+TEST(UnguessableTokenTest, VerifyConstructors) {
+  UnguessableToken token = UnguessableToken::Create();
+  EXPECT_FALSE(token.is_empty());
+  EXPECT_TRUE(token);
+
+  UnguessableToken copied_token(token);
+  EXPECT_TRUE(copied_token);
+  EXPECT_EQ(token, copied_token);
+
+  UnguessableToken uninitialized;
+  EXPECT_TRUE(uninitialized.is_empty());
+  EXPECT_FALSE(uninitialized);
+
+  EXPECT_TRUE(UnguessableToken().is_empty());
+  EXPECT_FALSE(UnguessableToken());
+}
+
+TEST(UnguessableTokenTest, VerifySerialization) {
+  UnguessableToken token = UnguessableToken::Create();
+
+  uint64_t high = 0;
+  uint64_t low = 0;
+  token.Serialize(&high, &low);
+
+  EXPECT_TRUE(high);
+  EXPECT_TRUE(low);
+
+  UnguessableToken Deserialized = UnguessableToken::Deserialize(high, low);
+  EXPECT_EQ(token, Deserialized);
+}
+
+TEST(UnguessableTokenTest, VerifySmallerThanOperator) {
+  // Deserialize is used for testing purposes.
+  // Use UnguessableToken::Create() in production code instead.
+
+  // a.low < b.low and a.high == b.high.
+  TestSmallerThanOperator(UnguessableToken::Deserialize(0, 1),

[danakj, 2016/09/16 22:18:32]

Use SCOPED_TRACE for each call to TestSmallerThanOperator so we can tell which
one caused a failure if they fail.

[tguilbert, 2016/09/16 22:48:15]

Done.

+                          UnguessableToken::Deserialize(0, 5));
+
+  // a.low == b.low and a.high < b.high.
+  TestSmallerThanOperator(UnguessableToken::Deserialize(1, 0),
+                          UnguessableToken::Deserialize(5, 0));
+
+  // a.low < b.low and a.high < b.high.
+  TestSmallerThanOperator(UnguessableToken::Deserialize(1, 1),
+                          UnguessableToken::Deserialize(5, 5));
+
+  // a.low > b.low and a.high < b.high.
+  TestSmallerThanOperator(UnguessableToken::Deserialize(1, 10),
+                          UnguessableToken::Deserialize(10, 1));
+}
+
+TEST(UnguessableTokenTest, VerifyHash) {
+  UnguessableToken token = UnguessableToken::Create();
+
+  uint64_t high, low;
+  token.Serialize(&high, &low);
+
+  EXPECT_EQ(base::HashInts64(high, low), UnguessableTokenHash{}(token));

[danakj, 2016/09/16 22:18:32]

nit: UnguessableTokenHash()(token)

(chromium-dev has asked that we use {} for constructing containers with their
contents, and () for calling other constructors)

[tguilbert, 2016/09/16 22:48:14]

Done.

+}
+
+TEST(UnguessableTokenTest, VerifyBasicUniqueness) {
+  EXPECT_NE(UnguessableToken::Create(), UnguessableToken::Create());
+
+  uint64_t high, low;
+  UnguessableToken::Create().Serialize(&high, &low);
+  EXPECT_NE(high, low);
+}
+}