[NC Apple coverage] Add tests for CBPeripheral category methods and update GNCFakePeripheral.

PiperOrigin-RevId: 814026340

internal/platform/implementation/apple/Mediums/BLE/Tests/BUILD

@@ -41,6 +41,7 @@ objc_library(
         "GNCMBleUtilsTest.m",
         "GNCMConnectionsTest.m",
         "GNCMFakeConnection.mm",
+        "GNCPeripheralTest.m",
         "NSData+GNCBase85Test.m",
         "NSData+GNCWebSafeBase64Test.m",
     ],
@@ -62,6 +63,7 @@ objc_library(
         "//internal/platform/implementation/apple/Mediums/BLE/Sockets:Shared",
         "//third_party/apple_frameworks:CoreBluetooth",
         "//third_party/apple_frameworks:Foundation",
+        "//third_party/apple_frameworks:ObjectiveC",
         "//third_party/apple_frameworks:XCTest",
     ],
 )

internal/platform/implementation/apple/Mediums/BLE/Tests/GNCFakePeripheral.h

@@ -22,6 +22,9 @@ NS_ASSUME_NONNULL_BEGIN
 /** A fake implementation of @c GNCPeripheral to inject for testing. */
 @interface GNCFakePeripheral : NSObject <GNCPeripheral>
 
+/** The peripheral's delegate. */
+@property(nonatomic, nullable, readwrite) id<CBPeripheralDelegate> delegate;
+
 /**
  * Similates a @c discoverServices: error.
  *

internal/platform/implementation/apple/Mediums/BLE/Tests/GNCFakePeripheral.m

@@ -41,8 +41,6 @@ NS_ASSUME_NONNULL_BEGIN
   NSUUID *_identifier;
 }
 
-@synthesize peripheralDelegate;
-
 - (instancetype)init {
   self = [super init];
   if (self) {
@@ -52,6 +50,14 @@ NS_ASSUME_NONNULL_BEGIN
   return self;
 }
 
+- (void)setPeripheralDelegate:(nullable id<GNCPeripheralDelegate>)peripheralDelegate {
+  self.delegate = peripheralDelegate;
+}
+
+- (nullable id<GNCPeripheralDelegate>)peripheralDelegate {
+  return (id<GNCPeripheralDelegate>)self.delegate;
+}
+
 - (NSUUID *)identifier {
   return _identifier;
 }
@@ -68,7 +74,7 @@ NS_ASSUME_NONNULL_BEGIN
       }
     }
 
-    [peripheralDelegate gnc_peripheral:self didDiscoverServices:_discoverServicesError];
+    [self.peripheralDelegate gnc_peripheral:self didDiscoverServices:_discoverServicesError];
   }];
 }
 
@@ -90,7 +96,7 @@ NS_ASSUME_NONNULL_BEGIN
       service.characteristics = characteristics;
     }
 
-    [peripheralDelegate gnc_peripheral:self
+    [self.peripheralDelegate gnc_peripheral:self
         didDiscoverCharacteristicsForService:service
                                        error:_discoverCharacteristicsForServiceError];
   }];
@@ -102,9 +108,9 @@ NS_ASSUME_NONNULL_BEGIN
       characteristic.value = [NSData data];
     }
 
-    [peripheralDelegate gnc_peripheral:self
-        didUpdateValueForCharacteristic:characteristic
-                                  error:_readValueForCharacteristicError];
+    [self.peripheralDelegate gnc_peripheral:self
+            didUpdateValueForCharacteristic:characteristic
+                                      error:_readValueForCharacteristicError];
   }];
 }
 
@@ -112,11 +118,11 @@ NS_ASSUME_NONNULL_BEGIN
   [self delayDelegateUsingBlock:^() {
     CBL2CAPChannel *channel = [[CBL2CAPChannel alloc] init];
     if (_openL2CAPChannelError) {
-      [peripheralDelegate gnc_peripheral:self
-                     didOpenL2CAPChannel:channel
-                                   error:_openL2CAPChannelError];
+      [self.peripheralDelegate gnc_peripheral:self
+                          didOpenL2CAPChannel:channel
+                                        error:_openL2CAPChannelError];
     } else {
-      [peripheralDelegate gnc_peripheral:self didOpenL2CAPChannel:channel error:nil];
+      [self.peripheralDelegate gnc_peripheral:self didOpenL2CAPChannel:channel error:nil];
     }
   }];
 }

internal/platform/implementation/apple/Mediums/BLE/Tests/GNCPeripheralTest.m

@@ -0,0 +1,68 @@
+// 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/BLE/GNCPeripheral.h"
+
+#import <CoreBluetooth/CoreBluetooth.h>
+#import <XCTest/XCTest.h>
+#import <objc/runtime.h>
+
+#import "internal/platform/implementation/apple/Mediums/BLE/Tests/GNCFakePeripheral.h"
+
+/** Fake delegate of @c GNCPeripheralDelegate */
+@interface GNCFakePeripheralDelegate : NSObject <GNCPeripheralDelegate>
+@end
+
+@implementation GNCFakePeripheralDelegate
+@end
+
+@interface GNCPeripheralTest : XCTestCase
+@end
+
+@implementation GNCPeripheralTest
+
+- (void)testSetPeripheralDelegate_SetsDelegate {
+  GNCFakePeripheral *fakePeripheral = [[GNCFakePeripheral alloc] init];
+  id<GNCPeripheralDelegate> delegate = [[GNCFakePeripheralDelegate alloc] init];
+
+  // Get IMP of the category method.
+  Method setMethod =
+      class_getInstanceMethod([CBPeripheral class], @selector(setPeripheralDelegate:));
+  void (*setImp)(id, SEL, id) = (void (*)(id, SEL, id))method_getImplementation(setMethod);
+
+  // Call the implementation directly on the fake.
+  setImp(fakePeripheral, @selector(setPeripheralDelegate:), delegate);
+
+  // Verify that the underlying delegate setter was called.
+  XCTAssertEqual(fakePeripheral.delegate, delegate);
+}
+
+- (void)testPeripheralDelegate_GetsDelegate {
+  GNCFakePeripheral *fakePeripheral = [[GNCFakePeripheral alloc] init];
+  id<GNCPeripheralDelegate> delegate = [[GNCFakePeripheralDelegate alloc] init];
+
+  // Set the underlying delegate property.
+  fakePeripheral.delegate = delegate;
+
+  // Get IMP of the category method.
+  Method getMethod = class_getInstanceMethod([CBPeripheral class], @selector(peripheralDelegate));
+  id (*getImp)(id, SEL) = (id (*)(id, SEL))method_getImplementation(getMethod);
+
+  // Call the implementation directly and check the result.
+  id result = getImp(fakePeripheral, @selector(peripheralDelegate));
+
+  XCTAssertEqual(result, delegate);
+}
+
+@end