From 9e050cc73a17372d4a824f3de84be56559029d8a Mon Sep 17 00:00:00 2001
From: Edwin Wu <edwinwu@google.com>
Date: Tue, 16 Sep 2025 04:24:35 -0700
Subject: [PATCH] [NC Apple coverage] Add tests for timer.mm.

PiperOrigin-RevId: 807639173
---
 .../platform/implementation/apple/Tests/BUILD |   1 +
 .../apple/Tests/GNCTimerTest.mm               | 116 ++++++++++++++++++
 2 files changed, 117 insertions(+)
 create mode 100644 internal/platform/implementation/apple/Tests/GNCTimerTest.mm

diff --git a/internal/platform/implementation/apple/Tests/BUILD b/internal/platform/implementation/apple/Tests/BUILD
index 98ebae0d..bb164140 100644
--- a/internal/platform/implementation/apple/Tests/BUILD
+++ b/internal/platform/implementation/apple/Tests/BUILD
@@ -32,6 +32,7 @@ objc_library(
         "GNCPreferencesManagerTest.mm",
         "GNCScheduledExecutorTest.mm",
         "GNCSingleThreadExecutorTest.mm",
+        "GNCTimerTest.mm",
         "GNCUtilsTest.m",
         "GNCWifiLanMediumTest.mm",
         "UtilsTest.mm",
diff --git a/internal/platform/implementation/apple/Tests/GNCTimerTest.mm b/internal/platform/implementation/apple/Tests/GNCTimerTest.mm
new file mode 100644
index 00000000..924ef521
--- /dev/null
+++ b/internal/platform/implementation/apple/Tests/GNCTimerTest.mm
@@ -0,0 +1,116 @@
+// 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.
+
+#include "internal/platform/implementation/apple/timer.h"
+
+#import <XCTest/XCTest.h>
+
+#include <memory>
+
+@interface GNCTimerTest : XCTestCase
+@end
+
+@implementation GNCTimerTest
+
+- (void)testCreateTimer {
+  auto timer = std::make_unique<nearby::apple::Timer>();
+  XCTAssertTrue(timer != nullptr);
+}
+
+- (void)testStartAndFire {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"Timer fired"];
+  auto timer = std::make_unique<nearby::apple::Timer>();
+
+  bool fired = false;
+  XCTAssertTrue(timer->Create(10, 0, [&]() {
+    fired = true;
+    [expectation fulfill];
+  }));
+
+  [self waitForExpectationsWithTimeout:1.0 handler:nil];
+  XCTAssertTrue(fired);
+}
+
+- (void)testStop {
+  auto timer = std::make_unique<nearby::apple::Timer>();
+
+  bool fired = false;
+  XCTAssertTrue(timer->Create(1000, 0, [&]() { fired = true; }));
+
+  XCTAssertTrue(timer->Stop());
+
+  // Wait for a second to ensure the timer doesn't fire.
+  [NSRunLoop.currentRunLoop runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1.0]];
+  XCTAssertFalse(fired);
+}
+
+- (void)testPeriodicTimer {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"Timer fired twice"];
+  auto timer = std::make_unique<nearby::apple::Timer>();
+
+  int fireCount = 0;
+  XCTAssertTrue(timer->Create(10, 10, [&]() {
+    fireCount++;
+    if (fireCount == 2) {
+      [expectation fulfill];
+    }
+  }));
+
+  [self waitForExpectationsWithTimeout:1.0 handler:nil];
+  XCTAssertEqual(fireCount, 2);
+  XCTAssertTrue(timer->Stop());
+}
+
+- (void)testRestart {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"Timer fired"];
+  auto timer = std::make_unique<nearby::apple::Timer>();
+
+  bool firstFired = false;
+  XCTAssertTrue(timer->Create(1000, 0, [&]() { firstFired = true; }));
+
+  XCTAssertTrue(timer->Stop());
+
+  bool secondFired = false;
+  XCTAssertTrue(timer->Create(10, 0, [&]() {
+    secondFired = true;
+    [expectation fulfill];
+  }));
+
+  [self waitForExpectationsWithTimeout:1.0 handler:nil];
+  XCTAssertFalse(firstFired);
+  XCTAssertTrue(secondFired);
+}
+
+- (void)testStopWhenNotRunning {
+  auto timer = std::make_unique<nearby::apple::Timer>();
+  XCTAssertTrue(timer->Stop());
+}
+
+- (void)testFireNow {
+  XCTestExpectation* expectation = [self expectationWithDescription:@"Timer fired"];
+  auto timer = std::make_unique<nearby::apple::Timer>();
+
+  bool fired = false;
+  XCTAssertTrue(timer->Create(1000, 0, [&]() {
+    fired = true;
+    [expectation fulfill];
+  }));
+
+  XCTAssertTrue(timer->FireNow());
+
+  [self waitForExpectationsWithTimeout:1.0 handler:nil];
+  XCTAssertTrue(fired);
+}
+
+@end