Add unittests to keep InstanceType lists in sync

test/unittests/object-unittest.cc

+// Copyright 2016 the V8 project 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 <iostream>
+#include <limits>
+
+#include "src/objects-inl.h"
+#include "src/objects.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace v8 {
+namespace internal {
+
+TEST(Object, InstanceTypeListOrder) {
+  int current = 0;
+  int last = -1;
+  InstanceType current_type = static_cast<InstanceType>(current);
+  EXPECT_EQ(current_type, InstanceType::FIRST_TYPE);
+  EXPECT_EQ(current_type, InstanceType::INTERNALIZED_STRING_TYPE);
+#define TEST_INSTANCE_TYPE(type)                                           \
+  current_type = InstanceType::type;                                       \
+  current = static_cast<int>(current_type);                                \
+  if (current > static_cast<int>(LAST_NAME_TYPE)) {                        \
+    EXPECT_EQ(last + 1, current);                                          \
+  }                                                                        \
+  EXPECT_LT(last, current) << " INSTANCE_TYPE_LIST is not ordered: "       \
+                           << "last = " << static_cast<InstanceType>(last) \
+                           << " vs. current = " << current_type;           \
+  last = current;
+
+  INSTANCE_TYPE_LIST(TEST_INSTANCE_TYPE)
+#undef TEST_INSTANCE_TYPE
+}
+
+TEST(Object, StructListOrder) {
+  int current = static_cast<int>(InstanceType::ACCESSOR_INFO_TYPE);
+  int last = current - 1;
+  ASSERT_LT(0, last);
+  InstanceType current_type = static_cast<InstanceType>(current);
+#define TEST_STRUCT(type, class, name)                 \
+  current_type = InstanceType::type##_TYPE;            \
+  current = static_cast<int>(current_type);            \
+  EXPECT_EQ(last + 1, current)                         \
+      << " STRUCT_LIST is not ordered: "               \
+      << " last = " << static_cast<InstanceType>(last) \
+      << " vs. current = " << current_type;            \
+  last = current;
+
+  STRUCT_LIST(TEST_STRUCT)
+#undef TEST_STRUCT
+}
+
+}  // namespace internal
+}  // namespace v8