Index: base/safe_numerics_unittest.cc |
diff --git a/base/safe_numerics_unittest.cc b/base/safe_numerics_unittest.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..7e4b02a4b61546adf57b28831dbc266c998c0ac9 |
--- /dev/null |
+++ b/base/safe_numerics_unittest.cc |
@@ -0,0 +1,77 @@ |
+// Copyright 2013 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 <gtest/gtest.h> |
+ |
+#include <vector> |
+ |
+#include "base/safe_numerics.h" |
+ |
+namespace base { |
+namespace internal { |
+ |
+TEST(SafeNumerics, NumericCast) { |
+ int small_positive = 1; |
+ int small_negative = -1; |
+ int large_positive = INT_MAX; |
+ int large_negative = INT_MIN; |
+ |
+ // Narrow signed destination. |
+ EXPECT_TRUE(IsValidNumericCast<signed char>(small_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<signed char>(small_negative)); |
+ EXPECT_FALSE(IsValidNumericCast<signed char>(large_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<signed char>(large_negative)); |
+ EXPECT_TRUE(IsValidNumericCast<signed short>(small_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<signed short>(small_negative)); |
+ |
+ // Narrow unsigned destination. |
+ EXPECT_TRUE(IsValidNumericCast<unsigned char>(small_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned char>(small_negative)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned char>(large_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned char>(large_negative)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned short>(small_negative)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned short>(large_negative)); |
+ |
+ // Same width signed destination. |
+ EXPECT_TRUE(IsValidNumericCast<signed int>(small_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<signed int>(small_negative)); |
+ EXPECT_TRUE(IsValidNumericCast<signed int>(large_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<signed int>(large_negative)); |
+ |
+ // Same width unsigned destination. |
+ EXPECT_TRUE(IsValidNumericCast<unsigned int>(small_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned int>(small_negative)); |
+ EXPECT_TRUE(IsValidNumericCast<unsigned int>(large_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned int>(large_negative)); |
+ |
+ // Wider signed destination. |
+ EXPECT_TRUE(IsValidNumericCast<long long>(small_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<long long>(large_negative)); |
+ EXPECT_TRUE(IsValidNumericCast<long long>(small_positive)); |
+ EXPECT_TRUE(IsValidNumericCast<long long>(large_negative)); |
+ |
+ // Wider unsigned destination. |
+ EXPECT_TRUE(IsValidNumericCast<unsigned long long>(small_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned long long>(small_negative)); |
+ EXPECT_TRUE(IsValidNumericCast<unsigned long long>(large_positive)); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned long long>(large_negative)); |
+ |
+ // Negative to size_t. |
+ EXPECT_FALSE(IsValidNumericCast<size_t>(small_negative)); |
+ EXPECT_FALSE(IsValidNumericCast<size_t>(large_negative)); |
+ |
+ // Various edge cases. |
+ EXPECT_TRUE(IsValidNumericCast<int>(static_cast<short>(SHRT_MIN))); |
+ EXPECT_FALSE( |
+ IsValidNumericCast<unsigned short>(static_cast<short>(SHRT_MIN))); |
+ EXPECT_FALSE(IsValidNumericCast<unsigned short>(SHRT_MIN)); |
+ |
+ // Confirm that numeric_cast<> actually compiles. |
+ std::vector<int> v; |
+ unsigned int checked_size = base::numeric_cast<unsigned int>(v.size()); |
+ EXPECT_EQ(0, checked_size); |
+} |
+ |
+} // namespace internal |
+} // namespace base |