Fix device type to string.

PiperOrigin-RevId: 915051624

internal/platform/implementation/BUILD

@@ -195,3 +195,16 @@ cc_test(
         "@com_google_googletest//:gtest_main",
     ],
 )
+
+cc_test(
+    name = "device_info_test",
+    size = "small",
+    timeout = "moderate",
+    srcs = ["device_info_test.cc"],
+    deps = [
+        ":types",
+        "@com_github_protobuf_matchers//protobuf-matchers",
+        "@com_google_absl//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

internal/platform/implementation/device_info.h

@@ -31,23 +31,6 @@ class DeviceInfo {
  public:
   enum class ScreenStatus { kUndetermined = 0, kLocked, kUnlocked };
   enum class DeviceType { kUnknown = 0, kPhone, kTablet, kLaptop };
-  template <typename Sink>
-  void AbslStringify(Sink& sink, DeviceType device_type) {
-    switch (device_type) {
-      case DeviceType::kUnknown:
-        sink.Append("Unknown");
-        return;
-      case DeviceType::kPhone:
-        sink.Append("Phone");
-        return;
-      case DeviceType::kTablet:
-        sink.Append("Tablet");
-        return;
-      case DeviceType::kLaptop:
-        sink.Append("PC");
-        return;
-    }
-  }
   enum class OsType {
     kUnknown = 0,
     kAndroid,
@@ -88,6 +71,24 @@ class DeviceInfo {
   virtual bool AllowSleep() = 0;
 };
 
+template <typename Sink>
+void AbslStringify(Sink& sink, DeviceInfo::DeviceType device_type) {
+  switch (device_type) {
+    case DeviceInfo::DeviceType::kUnknown:
+      sink.Append("Unknown");
+      return;
+    case DeviceInfo::DeviceType::kPhone:
+      sink.Append("Phone");
+      return;
+    case DeviceInfo::DeviceType::kTablet:
+      sink.Append("Tablet");
+      return;
+    case DeviceInfo::DeviceType::kLaptop:
+      sink.Append("PC");
+      return;
+  }
+}
+
 }  // namespace api
 }  // namespace nearby
 

internal/platform/implementation/device_info_test.cc

@@ -0,0 +1,29 @@
+// Copyright 2026 Google LLC
+//
+// 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 "internal/platform/implementation/device_info.h"
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+
+namespace nearby::api {
+namespace {
+
+TEST(DeviceInfoTest, DeviceTypeToStringTest) {
+  DeviceInfo::DeviceType type = DeviceInfo::DeviceType::kPhone;
+  EXPECT_EQ(absl::StrCat(type), "Phone");
+}
+
+}  // namespace
+}  // namespace nearby::api