1 files changed, 123 insertions, 0 deletions
diff --git a/absl/base/internal/fast_type_id_test.cc b/absl/base/internal/fast_type_id_test.cc
new file mode 100644
index 00000000..16f3c145
--- /dev/null
+++ b/absl/base/internal/fast_type_id_test.cc
@@ -0,0 +1,123 @@
+// Copyright 2020 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/base/internal/fast_type_id.h"
+
+#include <cstdint>
+#include <map>
+#include <vector>
+
+#include "gtest/gtest.h"
+
+namespace {
+namespace bi = absl::base_internal;
+
+// NOLINTNEXTLINE
+#define PRIM_TYPES(A)   \
+  A(bool)               \
+  A(short)              \
+  A(unsigned short)     \
+  A(int)                \
+  A(unsigned int)       \
+  A(long)               \
+  A(unsigned long)      \
+  A(long long)          \
+  A(unsigned long long) \
+  A(float)              \
+  A(double)             \
+  A(long double)
+
+TEST(FastTypeIdTest, PrimitiveTypes) {
+  bi::FastTypeIdType type_ids[] = {
+#define A(T) bi::FastTypeId<T>(),
+    PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const T>(),
+    PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<volatile T>(),
+    PRIM_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const volatile T>(),
+    PRIM_TYPES(A)
+#undef A
+  };
+  size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
+
+  for (int i = 0; i < total_type_ids; ++i) {
+    EXPECT_EQ(type_ids[i], type_ids[i]);
+    for (int j = 0; j < i; ++j) {
+      EXPECT_NE(type_ids[i], type_ids[j]);
+    }
+  }
+}
+
+#define FIXED_WIDTH_TYPES(A) \
+  A(int8_t)                  \
+  A(uint8_t)                 \
+  A(int16_t)                 \
+  A(uint16_t)                \
+  A(int32_t)                 \
+  A(uint32_t)                \
+  A(int64_t)                 \
+  A(uint64_t)
+
+TEST(FastTypeIdTest, FixedWidthTypes) {
+  bi::FastTypeIdType type_ids[] = {
+#define A(T) bi::FastTypeId<T>(),
+    FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const T>(),
+    FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<volatile T>(),
+    FIXED_WIDTH_TYPES(A)
+#undef A
+#define A(T) bi::FastTypeId<const volatile T>(),
+    FIXED_WIDTH_TYPES(A)
+#undef A
+  };
+  size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
+
+  for (int i = 0; i < total_type_ids; ++i) {
+    EXPECT_EQ(type_ids[i], type_ids[i]);
+    for (int j = 0; j < i; ++j) {
+      EXPECT_NE(type_ids[i], type_ids[j]);
+    }
+  }
+}
+
+TEST(FastTypeIdTest, AliasTypes) {
+  using int_alias = int;
+  EXPECT_EQ(bi::FastTypeId<int_alias>(), bi::FastTypeId<int>());
+}
+
+TEST(FastTypeIdTest, TemplateSpecializations) {
+  EXPECT_NE(bi::FastTypeId<std::vector<int>>(),
+            bi::FastTypeId<std::vector<long>>());
+
+  EXPECT_NE((bi::FastTypeId<std::map<int, float>>()),
+            (bi::FastTypeId<std::map<int, double>>()));
+}
+
+struct Base {};
+struct Derived : Base {};
+struct PDerived : private Base {};
+
+TEST(FastTypeIdTest, Inheritance) {
+  EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<Derived>());
+  EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<PDerived>());
+}
+
+}  // namespace