Add boundary test case to StringToDouble

base/strings/string_number_conversions_unittest.cc

 // Copyright (c) 2012 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/strings/string_number_conversions.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 727 matching lines @@
 
     // Test different forms of representation.
     {"2.99792458e8", 299792458.0, true},
     {"149597870.691E+3", 149597870691.0, true},
     {"6.", 6.0, true},
 
     // Test around the largest/smallest value that a double can represent.
     {"9e307", 9e307, true},
     {"1.7976e308", 1.7976e308, true},
     {"1.7977e308", HUGE_VAL, false},
+    {"1.797693134862315807e+308", HUGE_VAL, true},
+    {"1.797693134862315808e+308", HUGE_VAL, false},
     {"9e308", HUGE_VAL, false},
     {"9e309", HUGE_VAL, false},
     {"9e999", HUGE_VAL, false},
     {"9e1999", HUGE_VAL, false},
     {"9e19999", HUGE_VAL, false},
     {"9e99999999999999999999", HUGE_VAL, false},
     {"-9e307", -9e307, true},
     {"-1.7976e308", -1.7976e308, true},
     {"-1.7977e308", -HUGE_VAL, false},
+    {"-1.797693134862315807e+308", -HUGE_VAL, true},
+    {"-1.797693134862315808e+308", -HUGE_VAL, false},
     {"-9e308", -HUGE_VAL, false},
     {"-9e309", -HUGE_VAL, false},
     {"-9e999", -HUGE_VAL, false},
     {"-9e1999", -HUGE_VAL, false},
     {"-9e19999", -HUGE_VAL, false},
     {"-9e99999999999999999999", -HUGE_VAL, false},
 
     // Test more exponents.
     {"1e-2", 0.01, true},
     {"42 ", 42.0, false},
@@ skipping 121 matching lines @@
   };
 
   for (const auto& test : cases) {
     double output;
     EXPECT_TRUE(StringToDouble(test.input, &output));
     EXPECT_EQ(bit_cast<uint64_t>(output), test.expected);
   }
 }
 
 }  // namespace base