diff --git a/toolchain/check/testdata/interop/cpp/enum/using.carbon b/toolchain/check/testdata/interop/cpp/enum/using.carbon
new file mode 100644
index 000000000000..701e907da17a
--- /dev/null
+++ b/toolchain/check/testdata/interop/cpp/enum/using.carbon
@@ -0,0 +1,138 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/uint.carbon
+//
+// AUTOUPDATE
+// TIP: To test this file alone, run:
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/enum/using.carbon
+// TIP: To dump output, run:
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/enum/using.carbon
+
+// --- enum.h
+
+
+enum class Color {Red, Blue, Green};
+
+using enum Color;
+
+class Zoo {
+public:
+  enum class Animal { Cat, Dog, Horse };
+};
+
+using enum Zoo::Animal;
+
+// --- import_enum.carbon
+
+library "[[@TEST_NAME]]";
+
+// CHECK:STDERR: import_enum.carbon:[[@LINE+10]]:10: in file included here [InCppInclude]
+// CHECK:STDERR: ./enum.h:5:7: warning: using enum declaration is a C++20 extension [CppInteropParseWarning]
+// CHECK:STDERR:     5 | using enum Color;
+// CHECK:STDERR:       |       ^
+// CHECK:STDERR:
+// CHECK:STDERR: import_enum.carbon:[[@LINE+5]]:10: in file included here [InCppInclude]
+// CHECK:STDERR: ./enum.h:12:7: warning: using enum declaration is a C++20 extension [CppInteropParseWarning]
+// CHECK:STDERR:    12 | using enum Zoo::Animal;
+// CHECK:STDERR:       |       ^
+// CHECK:STDERR:
+import Cpp library "enum.h";
+
+//@dump-sem-ir-begin
+fn F() {
+  let col : Cpp.Color = Cpp.Color.Red;
+  let colb : Cpp.Color = Cpp.Blue;
+  let pet : Cpp.Zoo.Animal = Cpp.Zoo.Animal.Cat;
+  let pet2 : Cpp.Zoo.Animal = Cpp.Dog;
+}
+//@dump-sem-ir-end
+
+// CHECK:STDOUT: --- import_enum.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %Color: type = class_type @Color [concrete]
+// CHECK:STDOUT:   %pattern_type.839: type = pattern_type %Color [concrete]
+// CHECK:STDOUT:   %int_0.40a: %Color = int_value 0 [concrete]
+// CHECK:STDOUT:   %int_1.a8e: %Color = int_value 1 [concrete]
+// CHECK:STDOUT:   %Zoo: type = class_type @Zoo [concrete]
+// CHECK:STDOUT:   %Animal: type = class_type @Animal [concrete]
+// CHECK:STDOUT:   %pattern_type.d9d: type = pattern_type %Animal [concrete]
+// CHECK:STDOUT:   %int_0.83f: %Animal = int_value 0 [concrete]
+// CHECK:STDOUT:   %int_1.afa: %Animal = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .Color = %Color.decl
+// CHECK:STDOUT:     .Blue = %int_1.a8e
+// CHECK:STDOUT:     .Zoo = %Zoo.decl
+// CHECK:STDOUT:     .Dog = %int_1.afa
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Color.decl: type = class_decl @Color [concrete = constants.%Color] {} {}
+// CHECK:STDOUT:   %int_0.40a: %Color = int_value 0 [concrete = constants.%int_0.40a]
+// CHECK:STDOUT:   %int_1.a8e: %Color = int_value 1 [concrete = constants.%int_1.a8e]
+// CHECK:STDOUT:   %Zoo.decl: type = class_decl @Zoo [concrete = constants.%Zoo] {} {}
+// CHECK:STDOUT:   %Animal.decl: type = class_decl @Animal [concrete = constants.%Animal] {} {}
+// CHECK:STDOUT:   %int_0.83f: %Animal = int_value 0 [concrete = constants.%int_0.83f]
+// CHECK:STDOUT:   %int_1.afa: %Animal = int_value 1 [concrete = constants.%int_1.afa]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %col.patt: %pattern_type.839 = value_binding_pattern col [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp.ref.loc18_25: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %Color.ref.loc18_28: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
+// CHECK:STDOUT:   %Red.ref: %Color = name_ref Red, imports.%int_0.40a [concrete = constants.%int_0.40a]
+// CHECK:STDOUT:   %.loc18: type = splice_block %Color.ref.loc18_16 [concrete = constants.%Color] {
+// CHECK:STDOUT:     %Cpp.ref.loc18_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:     %Color.ref.loc18_16: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %col: %Color = value_binding col, %Red.ref
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %colb.patt: %pattern_type.839 = value_binding_pattern colb [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp.ref.loc19_26: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %Blue.ref: %Color = name_ref Blue, imports.%int_1.a8e [concrete = constants.%int_1.a8e]
+// CHECK:STDOUT:   %.loc19: type = splice_block %Color.ref.loc19 [concrete = constants.%Color] {
+// CHECK:STDOUT:     %Cpp.ref.loc19_14: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:     %Color.ref.loc19: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %colb: %Color = value_binding colb, %Blue.ref
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %pet.patt: %pattern_type.d9d = value_binding_pattern pet [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp.ref.loc20_30: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %Zoo.ref.loc20_33: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
+// CHECK:STDOUT:   %Animal.ref.loc20_37: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
+// CHECK:STDOUT:   %Cat.ref: %Animal = name_ref Cat, imports.%int_0.83f [concrete = constants.%int_0.83f]
+// CHECK:STDOUT:   %.loc20: type = splice_block %Animal.ref.loc20_20 [concrete = constants.%Animal] {
+// CHECK:STDOUT:     %Cpp.ref.loc20_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:     %Zoo.ref.loc20_16: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
+// CHECK:STDOUT:     %Animal.ref.loc20_20: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %pet: %Animal = value_binding pet, %Cat.ref
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %pet2.patt: %pattern_type.d9d = value_binding_pattern pet2 [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp.ref.loc21_31: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %Dog.ref: %Animal = name_ref Dog, imports.%int_1.afa [concrete = constants.%int_1.afa]
+// CHECK:STDOUT:   %.loc21: type = splice_block %Animal.ref.loc21 [concrete = constants.%Animal] {
+// CHECK:STDOUT:     %Cpp.ref.loc21_14: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:     %Zoo.ref.loc21: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
+// CHECK:STDOUT:     %Animal.ref.loc21: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %pet2: %Animal = value_binding pet2, %Dog.ref
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT: