Update test font (#121306)

Update test font

Author: LongCatIsLooong

packages/flutter/test/cupertino/button_test.dart

@@ -12,7 +12,6 @@ import 'package:flutter_test/flutter_test.dart';
 import '../widgets/semantics_tester.dart';
 
 const TextStyle testStyle = TextStyle(
-  fontFamily: 'Ahem',
   fontSize: 10.0,
   letterSpacing: 0.0,
 );

packages/flutter/test/cupertino/route_test.dart

@@ -160,7 +160,7 @@ void main() {
 
     // Also shows the previous page's title next to the back button.
     expect(find.widgetWithText(CupertinoButton, 'An iPod'), findsOneWidget);
-    // 3 paddings + 1 ahem character at font size 34.0.
+    // 3 paddings + 1 test font character at font size 34.0.
     expect(tester.getTopLeft(find.text('An iPod')).dx, 8.0 + 4.0 + 34.0 + 6.0);
   });
 

packages/flutter/test/cupertino/text_field_test.dart

@@ -3496,10 +3496,7 @@ void main() {
           child: CupertinoTextField(
             dragStartBehavior: DragStartBehavior.down,
             controller: controller,
-            style: const TextStyle(
-              fontFamily: 'Ahem',
-              fontSize: 10.0,
-            ),
+            style: const TextStyle(fontSize: 10.0),
           ),
         ),
       ),
@@ -4045,10 +4042,7 @@ void main() {
           child: CupertinoTextField(
             dragStartBehavior: DragStartBehavior.down,
             controller: controller,
-            style: const TextStyle(
-              fontFamily: 'Ahem',
-              fontSize: 10.0,
-            ),
+            style: const TextStyle(fontSize: 10.0),
           ),
         ),
       ),
@@ -4180,10 +4174,7 @@ void main() {
           child: CupertinoTextField(
             dragStartBehavior: DragStartBehavior.down,
             controller: controller,
-            style: const TextStyle(
-              fontFamily: 'Ahem',
-              fontSize: 10.0,
-            ),
+            style: const TextStyle(fontSize: 10.0),
           ),
         ),
       ),
@@ -7858,7 +7849,6 @@ void main() {
   testWidgets('placeholder style overflow works', (WidgetTester tester) async {
     final String placeholder = 'hint text' * 20;
     const TextStyle placeholderStyle = TextStyle(
-      fontFamily: 'Ahem',
       fontSize: 14.0,
       overflow: TextOverflow.fade,
     );

packages/flutter/test/material/chip_test.dart

@@ -576,7 +576,7 @@ void main() {
   );
 
   testWidgets('Chip in row works ok', (WidgetTester tester) async {
-    const TextStyle style = TextStyle(fontFamily: 'Ahem', fontSize: 10.0);
+    const TextStyle style = TextStyle(fontSize: 10.0);
     await tester.pumpWidget(
       wrapForChip(
         child: const Row(