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base/template_util_unittest.cc

Index: base/template_util_unittest.cc
diff --git a/base/template_util_unittest.cc b/base/template_util_unittest.cc
index 921596474b6d9a38991506396a1c64148025885d..31808bbde88aa0e4ed4d6ba347ea4b4d9e91bee4 100644
--- a/base/template_util_unittest.cc
+++ b/base/template_util_unittest.cc
@@ -30,6 +30,22 @@ static_assert(!is_non_const_reference<const int&>::value,
               "IsNonConstReference");
 static_assert(is_non_const_reference<int&>::value, "IsNonConstReference");
 
+// underlying_number
+enum ClassicEnum : int { CLASSIC_ENUM_A };
+enum class ClassyEnum : int { A };
+
+static_assert(
+    std::is_same<decltype(underlying_number(int64_t(10))), int64_t>::value,
+    "underlying_number: failed to return an integer as its own type.");
+
+static_assert(
+    std::is_integral<decltype(underlying_number(CLASSIC_ENUM_A))>::value,
+    "underlying_number: failed to return an unscoped enum as an integer.");
+
+static_assert(
+    std::is_integral<decltype(underlying_number(ClassyEnum::A))>::value,
+    "underlying_number: failed to return a scoped enum as an integer.");
+
 class AssignParent {};
 class AssignChild : AssignParent {};