[NC Apple coverage] Refactor: Wrap Network.framework C functions for testability. Part I.

PiperOrigin-RevId: 828308553
2026-09-16 15:36:12 -04:00 · 2025-11-04 23:07:39 -08:00
parent d71b88c3a6
commit cee0b3815e
14 changed files with 657 additions and 0 deletions
@@ -26,6 +26,8 @@ objc_library(
    name = "WiFiCommon",
    srcs = [
        "GNCIPv4Address.m",
+        "GNCNWBrowseResultImpl.m",
+        "GNCNWBrowserImpl.m",
        "GNCNWConnectionImpl.m",
        "GNCNWFramework.m",
        "GNCNWFrameworkError.m",
@@ -36,6 +38,10 @@ objc_library(
    ],
    hdrs = [
        "GNCIPv4Address.h",
+        "GNCNWBrowseResult.h",
+        "GNCNWBrowseResultImpl.h",
+        "GNCNWBrowser.h",
+        "GNCNWBrowserImpl.h",
        "GNCNWConnection.h",
        "GNCNWConnectionImpl.h",
        "GNCNWFramework.h",
@@ -0,0 +1,87 @@
+// Copyright 2025 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.
+
+#import <Foundation/Foundation.h>
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * A protocol to wrap Network.framework C functions to allow for faking in tests.
+ */
+@protocol GNCNWBrowseResult <NSObject>
+
+/**
+ * Enumerates the interfaces associated with a browse result.
+ *
+ * @param browseResult The browse result to enumerate.
+ * @param block The block to apply to each interface.
+ */
+- (void)enumerateInterfaces:(nw_browse_result_t)browseResult
+                 usingBlock:(nw_browse_result_enumerate_interface_t)block;
+
+/**
+ * Returns the type of an interface, such as Wi-Fi or cellular.
+ *
+ * @param interface The interface to get the type of.
+ * @return The type of the interface.
+ */
+- (nw_interface_type_t)interfaceGetType:(nw_interface_t)interface;
+
+/**
+ * Copies the TXT record associated with a browse result.
+ *
+ * @param browseResult The browse result to copy the TXT record from.
+ * @return The TXT record object, or nil if one doesn't exist.
+ */
+- (nullable nw_txt_record_t)copyTXTRecordObject:(nw_browse_result_t)browseResult;
+
+/**
+ * Allows you to inspect the keys and values in a TXT record.
+ *
+ * @param txtRecord The TXT record to apply the block to.
+ * @param block The block to apply to each key-value pair in the TXT record.
+ */
+- (void)applyTXTRecord:(nw_txt_record_t)txtRecord block:(nw_txt_record_applier_t)block;
+
+/**
+ * Compares two browse results to determine if they refer to the same endpoint and if any specific
+ * attributes of the endpoint have changed.
+ *
+ * @param oldResult The older browse result.
+ * @param newResult The newer browse result.
+ * @return The changes between the two browse results.
+ */
+- (nw_browse_result_change_t)getChangesFrom:(nw_browse_result_t)oldResult
+                                         to:(nw_browse_result_t)newResult;
+
+/**
+ * Gets the endpoint associated with a browse result.
+ *
+ * @param result The browse result to get the endpoint from.
+ * @return The endpoint associated with the browse result, or nil if one doesn't exist.
+ */
+- (nullable nw_endpoint_t)copyEndpointFromResult:(nw_browse_result_t)result;
+
+/**
+ * Returns the service name if the endpoint is a Bonjour service endpoint.
+ *
+ * @param endpoint The endpoint to get the Bonjour service name from.
+ * @return The Bonjour service name, or nil if the endpoint is not a Bonjour service endpoint.
+ */
+- (nullable NSString *)getBonjourServiceNameFromEndpoint:(nw_endpoint_t)endpoint;
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,24 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowseResult.h"
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface GNCNWBrowseResultImpl : NSObject <GNCNWBrowseResult>
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,56 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowseResultImpl.h"
+
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation GNCNWBrowseResultImpl
+
+- (void)enumerateInterfaces:(nw_browse_result_t)browseResult
+                 usingBlock:(nw_browse_result_enumerate_interface_t)block {
+  nw_browse_result_enumerate_interfaces(browseResult, block);
+}
+
+- (nw_interface_type_t)interfaceGetType:(nw_interface_t)interface {
+  return nw_interface_get_type(interface);
+}
+
+- (nullable nw_txt_record_t)copyTXTRecordObject:(nw_browse_result_t)browseResult {
+  return nw_browse_result_copy_txt_record_object(browseResult);
+}
+
+- (void)applyTXTRecord:(nw_txt_record_t)txtRecord block:(nw_txt_record_applier_t)block {
+  nw_txt_record_apply(txtRecord, block);
+}
+
+- (nw_browse_result_change_t)getChangesFrom:(nw_browse_result_t)oldResult
+                                         to:(nw_browse_result_t)newResult {
+  return nw_browse_result_get_changes(oldResult, newResult);
+}
+
+- (nullable nw_endpoint_t)copyEndpointFromResult:(nw_browse_result_t)result {
+  return nw_browse_result_copy_endpoint(result);
+}
+
+- (nullable NSString *)getBonjourServiceNameFromEndpoint:(nw_endpoint_t)endpoint {
+  const char *name = nw_endpoint_get_bonjour_service_name(endpoint);
+  return name ? @(name) : nil;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,77 @@
+// Copyright 2025 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.
+
+#import <Foundation/Foundation.h>
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * A protocol that wraps nw_browser_t functions for testability.
+ */
+@protocol GNCNWBrowser <NSObject>
+
+/**
+ * Creates a new browser object with a browse descriptor and parameters.
+ *
+ * @param descriptor The descriptor that defines the service to browse for.
+ * @param parameters The parameters to use for browsing
+ * @return An initialized browser object.
+ */
+- (nw_browser_t)createWithDescriptor:(nw_browse_descriptor_t)descriptor
+                          parameters:(nw_parameters_t)parameters;
+
+/**
+ * Sets the dispatch queue on which to deliver browser events.
+ *
+ * @param browser The browser object to modify.
+ * @param queue The dispatch queue to use for browser events.
+ */
+- (void)setQueue:(nw_browser_t)browser queue:(dispatch_queue_t)queue;
+
+/**
+ * Sets a handler that is called when the set of discovered browse results changes.
+ *
+ * @param browser The browser object to modify.
+ * @param handler The handler to call when browse results change.
+ */
+- (void)setBrowseResultsChangedHandler:(nw_browser_t)browser
+                               handler:(nw_browser_browse_results_changed_handler_t)handler;
+
+/**
+ * Sets a handler that is called when the browser state changes.
+ *
+ * @param browser The browser object to modify.
+ * @param handler The handler to call when the browser state changes.
+ */
+- (void)setStateChangedHandler:(nw_browser_t)browser
+                       handler:(nw_browser_state_changed_handler_t)handler;
+
+/**
+ * Starts the browser, which will begin browsing for services.
+ *
+ * @param browser The browser object to start.
+ */
+- (void)start:(nw_browser_t)browser;
+
+/**
+ * Cancels the browser, which will stop browsing for services and invalidate the object.
+ *
+ * @param browser The browser object to cancel.
+ */
+- (void)cancel:(nw_browser_t)browser;
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,24 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowser.h"
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface GNCNWBrowserImpl : NSObject <GNCNWBrowser>
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,52 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowserImpl.h"
+
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation GNCNWBrowserImpl
+
+- (nw_browser_t)createWithDescriptor:(nw_browse_descriptor_t)descriptor
+                          parameters:(nw_parameters_t)parameters {
+  return nw_browser_create(descriptor, parameters);
+}
+
+- (void)setQueue:(nw_browser_t)browser queue:(dispatch_queue_t)queue {
+  nw_browser_set_queue(browser, queue);
+}
+
+- (void)setBrowseResultsChangedHandler:(nw_browser_t)browser
+                               handler:(nw_browser_browse_results_changed_handler_t)handler {
+  nw_browser_set_browse_results_changed_handler(browser, handler);
+}
+
+- (void)setStateChangedHandler:(nw_browser_t)browser
+                       handler:(nw_browser_state_changed_handler_t)handler {
+  nw_browser_set_state_changed_handler(browser, handler);
+}
+
+- (void)start:(nw_browser_t)browser {
+  nw_browser_start(browser);
+}
+
+- (void)cancel:(nw_browser_t)browser {
+  nw_browser_cancel(browser);
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -24,6 +24,8 @@ objc_library(
    name = "FakeNWFramework",
    testonly = True,
    srcs = [
+        "GNCFakeNWBrowseResult.m",
+        "GNCFakeNWBrowser.m",
        "GNCFakeNWConnection.m",
        "GNCFakeNWFramework.m",
        "GNCFakeNWFrameworkServerSocket.m",
@@ -31,6 +33,8 @@ objc_library(
        "GNCFakeNWListener.m",
    ],
    hdrs = [
+        "GNCFakeNWBrowseResult.h",
+        "GNCFakeNWBrowser.h",
        "GNCFakeNWConnection.h",
        "GNCFakeNWFramework.h",
        "GNCFakeNWFrameworkServerSocket.h",
@@ -49,6 +53,8 @@ objc_library(
    testonly = True,
    srcs = [
        "GNCIPAddressTest.mm",
+        "GNCNWBrowseResultImplTest.m",
+        "GNCNWBrowserImplTest.m",
        "GNCNWConnectionImplTest.m",
        "GNCNWFrameworkServerSocketTest.m",
        "GNCNWFrameworkSocketTest.m",
@@ -0,0 +1,37 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowseResult.h"
+
+#import <Foundation/Foundation.h>
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+// Fake interface for testing
+@interface GNCFakeNWInterface : NSObject <OS_nw_interface>
+@property(nonatomic) nw_interface_type_t type;
+@end
+
+@interface GNCFakeNWBrowseResult : NSObject <GNCNWBrowseResult>
+@property(nonatomic, copy) NSArray<GNCFakeNWInterface *> *interfaces;
+@property(nonatomic, nullable) NSDictionary<NSString *, NSString *> *txtRecord;
+
+@property(nonatomic) nw_browse_result_change_t getChangesFromResult;
+@property(nonatomic, nullable) nw_endpoint_t endpointFromResultResult;
+@property(nonatomic, nullable) NSString *getBonjourServiceNameFromEndpointResult;
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,75 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/Tests/GNCFakeNWBrowseResult.h"
+
+#import <Network/Network.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation GNCFakeNWInterface
+@end
+
+@implementation GNCFakeNWBrowseResult
+
+- (void)enumerateInterfaces:(nw_browse_result_t)browseResult
+                 usingBlock:(nw_browse_result_enumerate_interface_t)block {
+  for (GNCFakeNWInterface *interface in self.interfaces) {
+    if (!block((nw_interface_t)interface)) {
+      break;
+    }
+  }
+}
+
+- (nw_interface_type_t)interfaceGetType:(nw_interface_t)interface {
+  return ((GNCFakeNWInterface *)interface).type;
+}
+
+- (nullable nw_txt_record_t)copyTXTRecordObject:(nw_browse_result_t)browseResult {
+  return (nw_txt_record_t)browseResult;
+}
+
+- (void)applyTXTRecord:(nw_txt_record_t)txtRecord block:(nw_txt_record_applier_t)block {
+  GNCFakeNWBrowseResult *result = (GNCFakeNWBrowseResult *)txtRecord;
+  if (!result.txtRecord) {
+    return;
+  }
+  [result.txtRecord enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *value,
+                                                        BOOL *stop) {
+    const char *keyUTF8 = key.UTF8String;
+    const uint8_t *valueUTF8 = (const uint8_t *)value.UTF8String;
+    size_t valueLen = value.length;
+    block(keyUTF8, nw_txt_record_find_key_non_empty_value, valueUTF8, valueLen);
+  }];
+}
+
+- (nw_browse_result_change_t)getChangesFrom:(nw_browse_result_t)oldResult
+                                         to:(nw_browse_result_t)newResult {
+  return self.getChangesFromResult;
+}
+
+- (nullable nw_endpoint_t)copyEndpointFromResult:(nw_browse_result_t)result {
+  if (self.endpointFromResultResult) {
+    return self.endpointFromResultResult;
+  }
+  return nw_endpoint_create_host("fakehost", "1234");
+}
+
+- (nullable NSString *)getBonjourServiceNameFromEndpoint:(nw_endpoint_t)endpoint {
+  return self.getBonjourServiceNameFromEndpointResult ?: @"FakeService";
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,35 @@
+// Copyright 2025 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.
+
+#import <Network/Network.h>
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowser.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface GNCFakeNWBrowser : NSObject <GNCNWBrowser>
+
+@property(nonatomic, nullable) nw_browser_t createWithDescriptorResult;
+@property(nonatomic) BOOL simulateTimeout;
+@property(nonatomic) nw_browser_state_t stateForStart;
+@property(nonatomic, nullable) dispatch_queue_t setQueueQueue;
+@property(nonatomic, nullable)
+    nw_browser_browse_results_changed_handler_t browseResultsChangedHandler;
+@property(nonatomic, nullable) nw_browser_state_changed_handler_t stateChangedHandler;
+@property(nonatomic, readonly) BOOL cancelCalled;
+@property(nonatomic, nullable, readonly) nw_browser_t cancelledBrowser;
+
+@end
+
+NS_ASSUME_NONNULL_END
@@ -0,0 +1,72 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/Tests/GNCFakeNWBrowser.h"
+
+@implementation GNCFakeNWBrowser
+
+@synthesize createWithDescriptorResult = _createWithDescriptorResult;
+@synthesize setQueueQueue = _setQueueQueue;
+@synthesize browseResultsChangedHandler = _browseResultsChangedHandler;
+@synthesize stateChangedHandler = _stateChangedHandler;
+@synthesize cancelCalled = _cancelCalled;
+@synthesize cancelledBrowser = _cancelledBrowser;
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _stateForStart = nw_browser_state_ready;
+  }
+  return self;
+}
+
+- (nw_browser_t)createWithDescriptor:(nw_browse_descriptor_t)descriptor
+                          parameters:(nw_parameters_t)parameters {
+  // Return a unique object to represent the browser
+  _createWithDescriptorResult = (nw_browser_t)[[NSObject alloc] init];
+  return _createWithDescriptorResult;
+}
+
+- (void)setQueue:(nw_browser_t)browser queue:(dispatch_queue_t)queue {
+  self.setQueueQueue = queue;
+}
+
+- (void)setBrowseResultsChangedHandler:(nw_browser_t)browser
+                               handler:(nw_browser_browse_results_changed_handler_t)handler {
+  self.browseResultsChangedHandler = handler;
+}
+
+- (void)setStateChangedHandler:(nw_browser_t)browser
+                       handler:(nw_browser_state_changed_handler_t)handler {
+  self.stateChangedHandler = handler;
+}
+
+- (void)start:(nw_browser_t)browser {
+  if (_simulateTimeout) {
+    return;
+  }
+  // Simulate state change
+  if (self.stateChangedHandler) {
+    dispatch_async(self.setQueueQueue ?: dispatch_get_main_queue(), ^{
+      self.stateChangedHandler(self.stateForStart, nil);
+    });
+  }
+}
+
+- (void)cancel:(nw_browser_t)browser {
+  _cancelCalled = YES;
+  _cancelledBrowser = browser;
+}
+
+@end
@@ -0,0 +1,70 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowseResultImpl.h"
+
+#import <Network/Network.h>
+#import <XCTest/XCTest.h>
+
+@interface GNCNWBrowseResultImplTest : XCTestCase
+@end
+
+@implementation GNCNWBrowseResultImplTest
+
+- (void)testInit {
+  GNCNWBrowseResultImpl *browseResult = [[GNCNWBrowseResultImpl alloc] init];
+  XCTAssertNotNil(browseResult);
+}
+
+- (void)testGetBonjourServiceName {
+  GNCNWBrowseResultImpl *browseResult = [[GNCNWBrowseResultImpl alloc] init];
+  nw_endpoint_t endpoint =
+      nw_endpoint_create_bonjour_service("MyService", "_servicetype._tcp", "local.");
+  NSString *serviceName = [browseResult getBonjourServiceNameFromEndpoint:endpoint];
+  XCTAssertEqualObjects(serviceName, @"MyService");
+}
+
+- (void)testGetBonjourServiceName_NonBonjour {
+  GNCNWBrowseResultImpl *browseResult = [[GNCNWBrowseResultImpl alloc] init];
+  nw_endpoint_t endpoint = nw_endpoint_create_host("google.com", "443");
+  NSString *serviceName = [browseResult getBonjourServiceNameFromEndpoint:endpoint];
+  XCTAssertNil(serviceName);
+}
+
+- (void)testApplyTXTRecord {
+  GNCNWBrowseResultImpl *browseResult = [[GNCNWBrowseResultImpl alloc] init];
+  nw_txt_record_t txtRecord = nw_txt_record_create_dictionary();
+  NSData *value1Data = [@"value1" dataUsingEncoding:NSUTF8StringEncoding];
+  NSData *value2Data = [@"value2" dataUsingEncoding:NSUTF8StringEncoding];
+  nw_txt_record_set_key(txtRecord, "key1", value1Data.bytes, value1Data.length);
+  nw_txt_record_set_key(txtRecord, "key2", value2Data.bytes, value2Data.length);
+  NSMutableDictionary<NSString *, NSString *> *results = [[NSMutableDictionary alloc] init];
+  [browseResult applyTXTRecord:txtRecord
+                         block:^bool(const char *key, nw_txt_record_find_key_t found,
+                                     const uint8_t *value, size_t value_len) {
+                           if (found == nw_txt_record_find_key_non_empty_value) {
+                             NSString *valueString =
+                                 [[NSString alloc] initWithBytes:value
+                                                          length:value_len
+                                                        encoding:NSUTF8StringEncoding];
+                             [results setObject:valueString forKey:@(key)];
+                           }
+                           return YES;
+                         }];
+  XCTAssertEqual(results.count, 2);
+  XCTAssertEqualObjects(results[@"key1"], @"value1");
+  XCTAssertEqualObjects(results[@"key2"], @"value2");
+}
+
+@end
@@ -0,0 +1,36 @@
+// Copyright 2025 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.
+
+#import "internal/platform/implementation/apple/Mediums/WiFiCommon/GNCNWBrowserImpl.h"
+
+#import <Network/Network.h>
+#import <XCTest/XCTest.h>
+
+@interface GNCNWBrowserImplTest : XCTestCase
+@end
+
+@implementation GNCNWBrowserImplTest
+
+- (void)testInit {
+  GNCNWBrowserImpl *browser = [[GNCNWBrowserImpl alloc] init];
+  XCTAssertNotNil(browser);
+}
+
+// NOTE: The methods in GNCNWBrowserImpl call C functions from the Network.framework
+// (e.g., nw_browser_create, nw_browser_start, nw_browser_cancel).
+// OCMock cannot directly mock these C functions. To test these interactions,
+// a lower-level interception method or a different testing strategy would be required.
+// We can only test the basic initialization here.
+
+@end