Make mojom-generated C++ string constants really constant.

mojo/public/cpp/bindings/tests/constant_unittest.cc

 // Copyright 2015 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 <cmath>
+
+#include "base/strings/string_piece.h"
 #include "mojo/public/interfaces/bindings/tests/test_constants.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 
 TEST(ConstantTest, GlobalConstants) {
   // Compile-time constants.
   static_assert(kBoolValue == true, "");
   static_assert(kInt8Value == -2, "");
   static_assert(kUint8Value == 128U, "");
   static_assert(kInt16Value == -233, "");
   static_assert(kUint16Value == 44204U, "");
   static_assert(kInt32Value == -44204, "");
   static_assert(kUint32Value == 4294967295U, "");
   static_assert(kInt64Value == -9223372036854775807, "");
   static_assert(kUint64Value == 9999999999999999999ULL, "");
+  static_assert(kDoubleValue == 3.14159, "");
+  static_assert(kFloatValue == 2.71828f, "");
 
-  EXPECT_DOUBLE_EQ(kDoubleValue, 3.14159);
-  EXPECT_FLOAT_EQ(kFloatValue, 2.71828f);
+  EXPECT_EQ(base::StringPiece(kStringValue), "test string contents");
+  EXPECT_TRUE(std::isnan(kDoubleNaN));
+  EXPECT_TRUE(std::isinf(kDoubleInfinity));
+  EXPECT_TRUE(std::isinf(kDoubleNegativeInfinity));
+  EXPECT_NE(kDoubleInfinity, kDoubleNegativeInfinity);
+  EXPECT_TRUE(std::isnan(kFloatNaN));
+  EXPECT_TRUE(std::isinf(kFloatInfinity));
+  EXPECT_TRUE(std::isinf(kFloatNegativeInfinity));
+  EXPECT_NE(kFloatInfinity, kFloatNegativeInfinity);
 }
 
 TEST(ConstantTest, StructConstants) {
   // Compile-time constants.
   static_assert(StructWithConstants::kInt8Value == 5U, "");
+  static_assert(StructWithConstants::kFloatValue == 765.432f, "");
 
-  EXPECT_FLOAT_EQ(StructWithConstants::kFloatValue, 765.432f);
+  EXPECT_EQ(base::StringPiece(StructWithConstants::kStringValue),
+            "struct test string contents");
 }
 
 TEST(ConstantTest, InterfaceConstants) {
   // Compile-time constants.
   static_assert(InterfaceWithConstants::kUint32Value == 20100722, "");
+  static_assert(InterfaceWithConstants::kDoubleValue == 12.34567, "");
 
-  EXPECT_DOUBLE_EQ(InterfaceWithConstants::kDoubleValue, 12.34567);
+  EXPECT_EQ(base::StringPiece(InterfaceWithConstants::kStringValue),
+            "interface test string contents");
+  EXPECT_EQ(base::StringPiece(InterfaceWithConstants::Name_),
+            "mojo::test::InterfaceWithConstants");
 }
 
 }  // namespace test
 }  // namespace mojo