Use bundled Roboto in all tests (#16218)

* Use bundled Roboto in all tests

Author: yjbanov

lib/web_ui/dev/goldens_lock.yaml

@@ -1,2 +1,2 @@
 repository: https://github.com/flutter/goldens.git
-revision: 3db2bb2329e7277c34389a92507eacaab774c8e8
+revision: 43254f4abddc2542ece540f222545970caf12908

lib/web_ui/lib/src/engine/dom_renderer.dart

@@ -343,7 +343,7 @@ flt-glass-pane * {
     setElementStyle(bodyElement, 'touch-action', 'none');
 
     // These are intentionally outrageous font parameters to make sure that the
-    // apps fully specifies their text styles.
+    // apps fully specify their text styles.
     setElementStyle(bodyElement, 'font', defaultCssFont);
     setElementStyle(bodyElement, 'color', 'red');
 

lib/web_ui/test/golden_tests/engine/canvas_draw_image_golden_test.dart

@@ -12,6 +12,8 @@ import 'package:test/test.dart';
 
 import 'package:web_engine_tester/golden_tester.dart';
 
+import 'scuba.dart';
+
 void main() async {
   const double screenWidth = 600.0;
   const double screenHeight = 800.0;
@@ -39,11 +41,10 @@ void main() async {
 
   setUp(() async {
     debugEmulateFlutterTesterEnvironment = true;
-    await webOnlyInitializePlatform();
-    webOnlyFontCollection.debugRegisterTestFonts();
-    await webOnlyFontCollection.ensureFontsLoaded();
   });
 
+  setUpStableTestFonts();
+
   test('Paints image', () async {
     final RecordingCanvas rc =
         RecordingCanvas(const Rect.fromLTRB(0, 0, 400, 300));

lib/web_ui/test/golden_tests/engine/canvas_golden_test.dart

@@ -10,6 +10,8 @@ import 'package:test/test.dart';
 
 import 'package:web_engine_tester/golden_tester.dart';
 
+import 'scuba.dart';
+
 void main() async {
   final Rect region = Rect.fromLTWH(0, 0, 500, 100);
 
@@ -22,11 +24,7 @@ void main() async {
     html.document.querySelector('flt-scene-host').append(testScene);
   }
 
-  setUp(() async {
-    await webOnlyInitializePlatform();
-    webOnlyFontCollection.debugRegisterTestFonts();
-    await webOnlyFontCollection.ensureFontsLoaded();
-  });
+  setUpStableTestFonts();
 
   tearDown(() {
     html.document.querySelector('flt-scene').remove();

lib/web_ui/test/golden_tests/engine/multiline_text_clipping_golden_test.dart

@@ -17,6 +17,8 @@ void main() async {
     viewportSize: const Size(600, 600),
   );
 
+  setUpStableTestFonts();
+
   void paintTest(EngineCanvas canvas, PaintTest painter) {
     final RecordingCanvas recordingCanvas =
         RecordingCanvas(const Rect.fromLTWH(0, 0, 600, 600));
@@ -116,7 +118,7 @@ void drawQuickBrownFox(RecordingCanvas canvas) {
         textStyle: TextStyle(
           color: const Color(0xFF000000),
           decoration: TextDecoration.none,
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
           background: Paint()..color = const Color.fromRGBO(50, 255, 50, 1.0),
         ),

lib/web_ui/test/golden_tests/engine/scuba.dart

@@ -132,7 +132,7 @@ void testEachCanvas(String description, CanvasTest body,
 
 final ui.TextStyle _defaultTextStyle = ui.TextStyle(
   color: const ui.Color(0xFF000000),
-  fontFamily: 'Arial',
+  fontFamily: 'Roboto',
   fontSize: 14,
 );
 
@@ -149,3 +149,13 @@ ui.Paragraph paragraph(
   builder.pop();
   return builder.build()..layout(ui.ParagraphConstraints(width: maxWidth));
 }
+
+/// Configures the test to use bundled Roboto and Ahem fonts to avoid golden
+/// screenshot differences due to differences in the preinstalled system fonts.
+void setUpStableTestFonts() {
+  setUp(() async {
+    await ui.webOnlyInitializePlatform();
+    ui.webOnlyFontCollection.debugRegisterTestFonts();
+    await ui.webOnlyFontCollection.ensureFontsLoaded();
+  });
+}

lib/web_ui/test/golden_tests/engine/text_overflow_golden_test.dart

@@ -27,10 +27,12 @@ void main() async {
 
   final TextStyle warningStyle = TextStyle(
     color: const Color(0xFFFF0000),
-    fontFamily: 'Arial',
+    fontFamily: 'Roboto',
     fontSize: 10,
   );
 
+  setUpStableTestFonts();
+
   Paragraph warning(String text) {
     return paragraph(text, textStyle: warningStyle);
   }

lib/web_ui/test/golden_tests/engine/text_style_golden_test.dart

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:test/test.dart';
 import 'package:ui/ui.dart';
 import 'package:ui/src/engine.dart';
 
@@ -12,6 +13,8 @@ void main() async {
     viewportSize: const Size(800, 800),
   );
 
+  setUpStableTestFonts();
+
   void drawLetterAndWordSpacing(EngineCanvas canvas) {
     Offset offset = Offset.zero;
 
@@ -21,7 +24,7 @@ void main() async {
             textStyle: TextStyle(
                 color: const Color(0xFF000000),
                 decoration: TextDecoration.none,
-                fontFamily: 'Arial',
+                fontFamily: 'Roboto',
                 fontSize: 30,
                 letterSpacing: spacing)),
         offset,
@@ -32,7 +35,7 @@ void main() async {
       final TextStyle textStyle = TextStyle(
           color: const Color(0xFF00FF00),
           decoration: TextDecoration.none,
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
           wordSpacing: spacing);
       canvas.drawParagraph(
@@ -66,7 +69,7 @@ void main() async {
         decoration: TextDecoration.underline,
         decorationStyle: decorationStyle,
         decorationColor: const Color.fromRGBO(50, 50, 50, 1.0),
-        fontFamily: 'Arial',
+        fontFamily: 'Roboto',
         fontSize: 30,
       );
       canvas.drawParagraph(
@@ -105,7 +108,7 @@ void main() async {
         decoration: decoration,
         decorationStyle: TextDecorationStyle.solid,
         decorationColor: const Color.fromRGBO(255, 160, 0, 1.0),
-        fontFamily: 'Arial',
+        fontFamily: 'Roboto',
         fontSize: 20,
       );
       canvas.drawParagraph(
@@ -135,7 +138,7 @@ void main() async {
         textStyle: TextStyle(
           color: const Color.fromRGBO(0, 0, 0, 1.0),
           background: Paint()..color = const Color.fromRGBO(255, 50, 50, 1.0),
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
         ),
       ),
@@ -150,7 +153,7 @@ void main() async {
         textStyle: TextStyle(
           color: const Color.fromRGBO(0, 0, 0, 1.0),
           background: Paint()..color = const Color.fromRGBO(50, 50, 255, 1.0),
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
         ),
       ),
@@ -167,7 +170,7 @@ void main() async {
         textStyle: TextStyle(
           color: const Color.fromRGBO(0, 0, 0, 1.0),
           background: Paint()..color = const Color.fromRGBO(255, 50, 50, 1.0),
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
           shadows: <Shadow>[
             Shadow(
@@ -189,7 +192,7 @@ void main() async {
         textStyle: TextStyle(
           color: const Color.fromRGBO(0, 0, 0, 1.0),
           background: Paint()..color = const Color.fromRGBO(50, 50, 255, 1.0),
-          fontFamily: 'Arial',
+          fontFamily: 'Roboto',
           fontSize: 30,
           shadows: <Shadow>[
             Shadow(