--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mlir/unittests/TableGen/EnumsGenTest.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,114 @@
+//===- EnumsGenTest.cpp - TableGen EnumsGen Tests -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "gmock/gmock.h"
+#include <type_traits>
+
+// Pull in generated enum utility declarations
+#include "EnumsGenTest.h.inc"
+// And definitions
+#include "EnumsGenTest.cpp.inc"
+
+// Test namespaces and enum class/utility names
+using Outer::Inner::ConvertToEnum;
+using Outer::Inner::ConvertToString;
+using Outer::Inner::StrEnum;
+
+TEST(EnumsGenTest, GeneratedStrEnumDefinition) {
+  EXPECT_EQ(0u, static_cast<uint64_t>(StrEnum::CaseA));
+  EXPECT_EQ(10u, static_cast<uint64_t>(StrEnum::CaseB));
+}
+
+TEST(EnumsGenTest, GeneratedI32EnumDefinition) {
+  EXPECT_EQ(5u, static_cast<uint64_t>(I32Enum::Case5));
+  EXPECT_EQ(10u, static_cast<uint64_t>(I32Enum::Case10));
+}
+
+TEST(EnumsGenTest, GeneratedDenseMapInfo) {
+  llvm::DenseMap<StrEnum, std::string> myMap;
+
+  myMap[StrEnum::CaseA] = "zero";
+  myMap[StrEnum::CaseB] = "one";
+
+  EXPECT_EQ(myMap[StrEnum::CaseA], "zero");
+  EXPECT_EQ(myMap[StrEnum::CaseB], "one");
+}
+
+TEST(EnumsGenTest, GeneratedSymbolToStringFn) {
+  EXPECT_EQ(ConvertToString(StrEnum::CaseA), "CaseA");
+  EXPECT_EQ(ConvertToString(StrEnum::CaseB), "CaseB");
+}
+
+TEST(EnumsGenTest, GeneratedStringToSymbolFn) {
+  EXPECT_EQ(llvm::Optional<StrEnum>(StrEnum::CaseA), ConvertToEnum("CaseA"));
+  EXPECT_EQ(llvm::Optional<StrEnum>(StrEnum::CaseB), ConvertToEnum("CaseB"));
+  EXPECT_EQ(llvm::None, ConvertToEnum("X"));
+}
+
+TEST(EnumsGenTest, GeneratedUnderlyingType) {
+  bool v = std::is_same<uint32_t, std::underlying_type<I32Enum>::type>::value;
+  EXPECT_TRUE(v);
+}
+
+TEST(EnumsGenTest, GeneratedBitEnumDefinition) {
+  EXPECT_EQ(0u, static_cast<uint32_t>(BitEnumWithNone::None));
+  EXPECT_EQ(1u, static_cast<uint32_t>(BitEnumWithNone::Bit1));
+  EXPECT_EQ(4u, static_cast<uint32_t>(BitEnumWithNone::Bit3));
+}
+
+TEST(EnumsGenTest, GeneratedSymbolToStringFnForBitEnum) {
+  EXPECT_EQ(stringifyBitEnumWithNone(BitEnumWithNone::None), "None");
+  EXPECT_EQ(stringifyBitEnumWithNone(BitEnumWithNone::Bit1), "Bit1");
+  EXPECT_EQ(stringifyBitEnumWithNone(BitEnumWithNone::Bit3), "Bit3");
+  EXPECT_EQ(
+      stringifyBitEnumWithNone(BitEnumWithNone::Bit1 | BitEnumWithNone::Bit3),
+      "Bit1|Bit3");
+}
+
+TEST(EnumsGenTest, GeneratedStringToSymbolForBitEnum) {
+  EXPECT_EQ(symbolizeBitEnumWithNone("None"), BitEnumWithNone::None);
+  EXPECT_EQ(symbolizeBitEnumWithNone("Bit1"), BitEnumWithNone::Bit1);
+  EXPECT_EQ(symbolizeBitEnumWithNone("Bit3"), BitEnumWithNone::Bit3);
+  EXPECT_EQ(symbolizeBitEnumWithNone("Bit3|Bit1"),
+            BitEnumWithNone::Bit3 | BitEnumWithNone::Bit1);
+
+  EXPECT_EQ(symbolizeBitEnumWithNone("Bit2"), llvm::None);
+  EXPECT_EQ(symbolizeBitEnumWithNone("Bit3|Bit4"), llvm::None);
+
+  EXPECT_EQ(symbolizeBitEnumWithoutNone("None"), llvm::None);
+}
+
+TEST(EnumsGenTest, GeneratedOperator) {
+  EXPECT_TRUE(bitEnumContains(BitEnumWithNone::Bit1 | BitEnumWithNone::Bit3,
+                              BitEnumWithNone::Bit1));
+  EXPECT_FALSE(bitEnumContains(BitEnumWithNone::Bit1 & BitEnumWithNone::Bit3,
+                               BitEnumWithNone::Bit1));
+}
+
+TEST(EnumsGenTest, GeneratedSymbolToCustomStringFn) {
+  EXPECT_EQ(stringifyPrettyIntEnum(PrettyIntEnum::Case1), "case_one");
+  EXPECT_EQ(stringifyPrettyIntEnum(PrettyIntEnum::Case2), "case_two");
+}
+
+TEST(EnumsGenTest, GeneratedCustomStringToSymbolFn) {
+  auto one = symbolizePrettyIntEnum("case_one");
+  EXPECT_TRUE(one);
+  EXPECT_EQ(*one, PrettyIntEnum::Case1);
+
+  auto two = symbolizePrettyIntEnum("case_two");
+  EXPECT_TRUE(two);
+  EXPECT_EQ(*two, PrettyIntEnum::Case2);
+
+  auto none = symbolizePrettyIntEnum("Case1");
+  EXPECT_FALSE(none);
+}