Silences compiler warnings in the Auth test file from #207 . (#219)

Author: XiangtianDai

Example/Auth/Tests/FIRAuthAppDelegateProxyTests.m

@@ -15,6 +15,7 @@
  */
 
 #import <XCTest/XCTest.h>
+#import <UIKit/UIKit.h>
 
 #import <objc/runtime.h>
 
@@ -161,6 +162,11 @@ @implementation FIRAuthAppDelegateProxyTests {
       @brief The fake URL for testing.
    */
   NSURL *_url;
+
+  /** @var _isIOS9orLater
+      @brief Whether the OS version is iOS 9 or later.
+   */
+  BOOL _isIOS9orLater;
 }
 
 - (void)setUp {
@@ -169,6 +175,7 @@ - (void)setUp {
   _deviceToken = [@"asdf" dataUsingEncoding:NSUTF8StringEncoding];
   _notification = @{ @"zxcv" : @1234 };
   _url = [NSURL URLWithString:@"https://abc.def/ghi"];
+  _isIOS9orLater = [[[UIDevice currentDevice] systemVersion] doubleValue] >= 9.0;
 }
 
 - (void)tearDown {
@@ -235,6 +242,10 @@ - (void)testDisabledByBundleEntry {
   imp_removeBlock(method_setImplementation(method, originalImplementation));
 }
 
+// Deprecated methods are call intentionally in tests to verify behaviors on older iOS systems.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+
 /** @fn testEmptyDelegateOneHandler
     @brief Tests that the proxy works against an empty @c UIApplicationDelegate for one handler.
  */
@@ -254,7 +265,7 @@ - (void)testEmptyDelegateOneHandler {
                    @selector(application:didReceiveRemoteNotification:fetchCompletionHandler:)]);
     XCTAssertFalse([delegate respondsToSelector:
                     @selector(application:didReceiveRemoteNotification:)]);
-    if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+    if (_isIOS9orLater) {
       XCTAssertTrue([delegate respondsToSelector:@selector(application:openURL:options:)]);
       XCTAssertFalse([delegate respondsToSelector:
                       @selector(application:openURL:sourceApplication:annotation:)]);
@@ -291,7 +302,7 @@ - (void)testEmptyDelegateOneHandler {
 
       // Verify one of the `application:openURL:...` methods is handled.
       OCMExpect([mockHandler canHandleURL:_url]).andReturn(YES);
-      if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+      if (_isIOS9orLater) {
         // Verify `application:openURL:options:` is handled.
         XCTAssertTrue([delegate application:_mockApplication openURL:_url options:@{}]);
       } else {
@@ -317,7 +328,7 @@ - (void)testEmptyDelegateOneHandler {
               fetchCompletionHandler:^(UIBackgroundFetchResult result) {
       XCTFail(@"Should not call completion handler.");
     }];
-    if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+    if (_isIOS9orLater) {
       XCTAssertFalse([delegate application:_mockApplication openURL:_url options:@{}]);
     } else {
       XCTAssertFalse([delegate application:_mockApplication
@@ -338,7 +349,7 @@ - (void)testEmptyDelegateOneHandler {
             fetchCompletionHandler:^(UIBackgroundFetchResult result) {
     XCTFail(@"Should not call completion handler.");
   }];
-  if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+  if (_isIOS9orLater) {
     XCTAssertFalse([delegate application:_mockApplication openURL:_url options:@{}]);
   } else {
     XCTAssertFalse([delegate application:_mockApplication
@@ -498,7 +509,7 @@ - (void)testModernDelegateWithUnaffectedInstance {
     XCTAssertFalse([delegate respondsToSelector:
                     @selector(application:didReceiveRemoteNotification:)]);
     XCTAssertTrue([delegate respondsToSelector:@selector(application:openURL:options:)]);
-    if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+    if (_isIOS9orLater) {
       XCTAssertFalse([delegate respondsToSelector:
                       @selector(application:openURL:sourceApplication:annotation:)]);
     } else {
@@ -536,7 +547,7 @@ - (void)testModernDelegateWithUnaffectedInstance {
 
       // Verify one of the `application:openURL:...` methods is handled.
       OCMExpect([mockHandler canHandleURL:_url]).andReturn(YES);
-      if (&UIApplicationOpenURLOptionsAnnotationKey) {  // iOS 9+
+      if (_isIOS9orLater) {
         // Verify `application:openURL:options:` is handled.
         XCTAssertTrue([delegate application:_mockApplication openURL:_url options:@{}]);
       } else {
@@ -671,6 +682,8 @@ - (void)testOtherLegacyDelegateHandleOpenURL {
   delegate.urlOpened = nil;
 }
 
+#pragma clang diagnostic pop  // ignored "-Wdeprecated-declarations"
+
 @end
 
 NS_ASSUME_NONNULL_END