Migrate //testing to nullsafety (#26825)

testing/dart/canvas_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
-
 import 'dart:async';
 import 'dart:io';
 import 'dart:typed_data';
@@ -54,8 +52,6 @@ void testNoCrashes() {
     final Picture picture = recorder.endRecording();
     final Image image = await picture.toImage(1, 1);
 
-    try { Canvas(null, null); } catch (error) { } // ignore: empty_catches
-    try { Canvas(null, rect); } catch (error) { } // ignore: empty_catches
     try { Canvas(PictureRecorder(), null); } catch (error) { } // ignore: empty_catches
     try { Canvas(PictureRecorder(), rect); } catch (error) { } // ignore: empty_catches
 
@@ -88,19 +84,18 @@ void testNoCrashes() {
     testCanvas((Canvas canvas) => canvas.drawRawPoints(PointMode.points, Float32List(0), paint));
     testCanvas((Canvas canvas) => canvas.drawRect(rect, paint));
     testCanvas((Canvas canvas) => canvas.drawRRect(rrect, paint));
-    testCanvas((Canvas canvas) => canvas.drawShadow(path, color, double.nan, null));
     testCanvas((Canvas canvas) => canvas.drawShadow(path, color, double.nan, false));
     testCanvas((Canvas canvas) => canvas.drawShadow(path, color, double.nan, true));
-    testCanvas((Canvas canvas) => canvas.drawVertices(Vertices(VertexMode.triangles, <Offset>[]), null, paint));
+    testCanvas((Canvas canvas) => canvas.drawVertices(Vertices(VertexMode.triangles, <Offset>[]), BlendMode.screen, paint));
     testCanvas((Canvas canvas) => canvas.getSaveCount());
     testCanvas((Canvas canvas) => canvas.restore());
     testCanvas((Canvas canvas) => canvas.rotate(double.nan));
     testCanvas((Canvas canvas) => canvas.save());
     testCanvas((Canvas canvas) => canvas.saveLayer(rect, paint));
-    testCanvas((Canvas canvas) => canvas.saveLayer(null, null));
+    testCanvas((Canvas canvas) => canvas.saveLayer(null, paint));
     testCanvas((Canvas canvas) => canvas.scale(double.nan, double.nan));
     testCanvas((Canvas canvas) => canvas.skew(double.nan, double.nan));
-    testCanvas((Canvas canvas) => canvas.transform(null));
+    testCanvas((Canvas canvas) => canvas.transform(Float64List(16)));
     testCanvas((Canvas canvas) => canvas.translate(double.nan, double.nan));
   });
 }
@@ -112,8 +107,8 @@ Future<bool> fuzzyCompareImages(Image golden, Image img) async {
     return false;
   }
   int getPixel(ByteData data, int x, int y) => data.getUint32((x + y * golden.width) * 4);
-  final ByteData goldenData = await golden.toByteData();
-  final ByteData imgData = await img.toByteData();
+  final ByteData goldenData = (await golden.toByteData())!;
+  final ByteData imgData = (await img.toByteData())!;
   for (int y = 0; y < golden.height; y++) {
     for (int x = 0; x < golden.width; x++) {
       if (getPixel(goldenData, x, y) != getPixel(imgData, x, y)) {
@@ -144,7 +139,7 @@ Future<bool> fuzzyGoldenImageCompare(
   }
 
   if (!areEqual) {
-    final ByteData pngData = await image.toByteData(format: ImageByteFormat.png);
+    final ByteData pngData = (await image.toByteData(format: ImageByteFormat.png))!;
     final String outPath = path.join(imagesPath, 'found_' + goldenImageName);
     File(outPath).writeAsBytesSync(pngData.buffer.asUint8List());
     print('wrote: ' + outPath);
@@ -231,11 +226,7 @@ void main() {
     canvas.drawRawAtlas(image, Float32List(0), Float32List(0), Int32List(0), BlendMode.src, null, paint);
     canvas.drawRawAtlas(image, Float32List(0), Float32List(0), null, null, rect, paint);
 
-    expectAssertion(() => canvas.drawAtlas(image, <RSTransform>[transform], <Rect>[rect], <Color>[color], BlendMode.src, rect, null));
     expectAssertion(() => canvas.drawAtlas(image, <RSTransform>[transform], <Rect>[rect], <Color>[color], null, rect, paint));
-    expectAssertion(() => canvas.drawAtlas(image, <RSTransform>[transform], null, <Color>[color], BlendMode.src, rect, paint));
-    expectAssertion(() => canvas.drawAtlas(image, null, <Rect>[rect], <Color>[color], BlendMode.src, rect, paint));
-    expectAssertion(() => canvas.drawAtlas(null, <RSTransform>[transform], <Rect>[rect], <Color>[color], BlendMode.src, rect, paint));
   });
 
   test('Data lengths must match for drawAtlas methods', () async {

testing/dart/channel_buffers_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
-
 // KEEP THIS SYNCHRONIZED WITH ../../lib/web_ui/test/channel_buffers_test.dart
 
 import 'dart:async';
@@ -29,16 +27,15 @@ void main() {
     final ByteData data = _makeByteData('bar');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
     bool called = false;
-    void callback(ByteData responseData) {
+    void callback(ByteData? responseData) {
       called = true;
     }
     buffers.push(channel, data, callback);
-    await buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) {
+    await buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       expect(drainedData, equals(data));
       assert(!called);
       drainedCallback(drainedData);
       assert(called);
-      return;
     });
   });
 
@@ -46,13 +43,13 @@ void main() {
     const String channel = 'foo';
     final ByteData data = _makeByteData('message');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
-    void callback(ByteData responseData) {}
+    void callback(ByteData? responseData) {}
     buffers.push(channel, data, callback);
     final List<String> log = <String>[];
     final Completer<void> completer = Completer<void>();
     scheduleMicrotask(() { log.add('before drain, microtask'); });
     log.add('before drain');
-    buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
+    buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       log.add('callback');
       completer.complete();
     });
@@ -73,13 +70,12 @@ void main() {
     final ByteData data = _makeByteData('bar');
     final
     ui.ChannelBuffers buffers = ui.ChannelBuffers();
-    void callback(ByteData responseData) {}
+    void callback(ByteData? responseData) {}
     _resize(buffers, channel, 0);
     buffers.push(channel, data, callback);
     bool didCall = false;
-    await buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) {
+    await buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       didCall = true;
-      return;
     });
     expect(didCall, equals(false));
   });
@@ -88,9 +84,8 @@ void main() {
     const String channel = 'foo';
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
     bool didCall = false;
-    await buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) {
+    await buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       didCall = true;
-      return;
     });
     expect(didCall, equals(false));
   });
@@ -102,14 +97,14 @@ void main() {
     final ByteData three = _makeByteData('three');
     final ByteData four = _makeByteData('four');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
-    void callback(ByteData responseData) {}
+    void callback(ByteData? responseData) {}
     _resize(buffers, channel, 3);
     buffers.push(channel, one, callback);
     buffers.push(channel, two, callback);
     buffers.push(channel, three, callback);
     buffers.push(channel, four, callback);
     int counter = 0;
-    await buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) {
+    await buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       switch (counter) {
         case 0:
           expect(drainedData, equals(two));
@@ -122,7 +117,6 @@ void main() {
           break;
       }
       counter += 1;
-      return;
     });
     expect(counter, equals(3));
   });
@@ -133,18 +127,17 @@ void main() {
     final ByteData two = _makeByteData('two');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
     _resize(buffers, channel, 100);
-    void callback(ByteData responseData) {}
+    void callback(ByteData? responseData) {}
     buffers.push(channel, one, callback);
     buffers.push(channel, two, callback);
     _resize(buffers, channel, 1);
     int counter = 0;
-    await buffers.drain(channel, (ByteData drainedData, ui.PlatformMessageResponseCallback drainedCallback) {
+    await buffers.drain(channel, (ByteData? drainedData, ui.PlatformMessageResponseCallback drainedCallback) async {
       switch (counter) {
         case 0:
           expect(drainedData, equals(two));
       }
       counter += 1;
-      return;
     });
     expect(counter, equals(1));
   });
@@ -155,11 +148,11 @@ void main() {
     final ByteData two = _makeByteData('two');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
     bool didCallCallback = false;
-    void oneCallback(ByteData responseData) {
+    void oneCallback(ByteData? responseData) {
       expect(responseData, isNull);
       didCallCallback = true;
     }
-    void twoCallback(ByteData responseData) {
+    void twoCallback(ByteData? responseData) {
       fail('wrong callback called');
     }
     _resize(buffers, channel, 100);
@@ -176,11 +169,11 @@ void main() {
     final ByteData two = _makeByteData('two');
     final ui.ChannelBuffers buffers = ui.ChannelBuffers();
     bool didCallCallback = false;
-    void oneCallback(ByteData responseData) {
+    void oneCallback(ByteData? responseData) {
       expect(responseData, isNull);
       didCallCallback = true;
     }
-    void twoCallback(ByteData responseData) {
+    void twoCallback(ByteData? responseData) {
       fail('wrong callback called');
     }
     _resize(buffers, channel, 1);
@@ -211,37 +204,40 @@ void main() {
     final ByteData five = _makeByteData('five');
     final ByteData six = _makeByteData('six');
     final ByteData seven = _makeByteData('seven');
-    buffers.push('a', one, (ByteData data) { });
-    buffers.push('b', two, (ByteData data) { });
-    buffers.push('a', three, (ByteData data) { });
+    buffers.push('a', one, (ByteData? data) { });
+    buffers.push('b', two, (ByteData? data) { });
+    buffers.push('a', three, (ByteData? data) { });
     log.add('top');
-    buffers.setListener('a', (ByteData data, ui.PlatformMessageResponseCallback callback) {
-      log.add('a1: ${utf8.decode(data.buffer.asUint8List())}');
+    buffers.setListener('a', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
+      assert(data != null);
+      log.add('a1: ${utf8.decode(data!.buffer.asUint8List())}');
     });
     log.add('-1');
     await null;
     log.add('-2');
-    buffers.setListener('a', (ByteData data, ui.PlatformMessageResponseCallback callback) {
-      log.add('a2: ${utf8.decode(data.buffer.asUint8List())}');
+    buffers.setListener('a', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
+      assert(data != null);
+      log.add('a2: ${utf8.decode(data!.buffer.asUint8List())}');
     });
     log.add('-3');
     await null;
     log.add('-4');
-    buffers.setListener('b', (ByteData data, ui.PlatformMessageResponseCallback callback) {
-      log.add('b: ${utf8.decode(data.buffer.asUint8List())}');
+    buffers.setListener('b', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
+      assert(data != null);
+      log.add('b: ${utf8.decode(data!.buffer.asUint8List())}');
     });
     log.add('-5');
     await null; // first microtask after setting listener drains the first message
     await null; // second microtask ends the draining.
     log.add('-6');
-    buffers.push('b', four, (ByteData data) { });
-    buffers.push('a', five, (ByteData data) { });
+    buffers.push('b', four, (ByteData? data) { });
+    buffers.push('a', five, (ByteData? data) { });
     log.add('-7');
     await null;
     log.add('-8');
     buffers.clearListener('a');
-    buffers.push('a', six, (ByteData data) { });
-    buffers.push('b', seven, (ByteData data) { });
+    buffers.push('a', six, (ByteData? data) { });
+    buffers.push('b', seven, (ByteData? data) { });
     await null;
     log.add('-9');
     expect(log, <String>[
@@ -271,24 +267,26 @@ void main() {
     final ByteData three = _makeByteData('three');
     final ByteData four = _makeByteData('four');
     buffers.handleMessage(_makeByteData('resize\ra\r10'));
-    buffers.push('a', one, (ByteData data) { });
-    buffers.push('a', two, (ByteData data) { });
-    buffers.push('a', three, (ByteData data) { });
+    buffers.push('a', one, (ByteData? data) { });
+    buffers.push('a', two, (ByteData? data) { });
+    buffers.push('a', three, (ByteData? data) { });
     log.add('-1');
-    buffers.setListener('a', (ByteData data, ui.PlatformMessageResponseCallback callback) {
-      log.add('a1: ${utf8.decode(data.buffer.asUint8List())}');
+    buffers.setListener('a', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
+      assert(data != null);
+      log.add('a1: ${utf8.decode(data!.buffer.asUint8List())}');
     });
     await null; // handles one
     log.add('-2');
     buffers.clearListener('a');
     await null;
     log.add('-3');
-    buffers.setListener('a', (ByteData data, ui.PlatformMessageResponseCallback callback) {
-      log.add('a2: ${utf8.decode(data.buffer.asUint8List())}');
+    buffers.setListener('a', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
+      assert(data != null);
+      log.add('a2: ${utf8.decode(data!.buffer.asUint8List())}');
     });
     log.add('-4');
     await null;
-    buffers.push('a', four, (ByteData data) { });
+    buffers.push('a', four, (ByteData? data) { });
     log.add('-5');
     await null;
     log.add('-6');
@@ -337,14 +335,14 @@ void main() {
     final Zone zone2 = Zone.current.fork();
     zone1.run(() {
       log.add('first zone run: ${Zone.current == zone1}');
-      buffers.setListener('a', (ByteData data, ui.PlatformMessageResponseCallback callback) {
+      buffers.setListener('a', (ByteData? data, ui.PlatformMessageResponseCallback callback) {
         log.add('callback1: ${Zone.current == zone1}');
         callback(data);
       });
     });
     zone2.run(() {
       log.add('second zone run: ${Zone.current == zone2}');
-      buffers.push('a', ByteData.sublistView(Uint8List.fromList(<int>[]), 0, 0), (ByteData data) {
+      buffers.push('a', ByteData.sublistView(Uint8List.fromList(<int>[]), 0, 0), (ByteData? data) {
         log.add('callback2: ${Zone.current == zone2}');
       });
     });

testing/dart/codec_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:io';
 import 'dart:typed_data';
 import 'dart:ui' as ui;

testing/dart/color_filter_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:typed_data';
 import 'dart:ui';
 
@@ -36,20 +35,12 @@ void main() {
     recorderCanvas.drawPaint(paint);
     final Picture picture = recorder.endRecording();
     final Image image = await picture.toImage(width, height);
-    final ByteData bytes = await image.toByteData();
+    final ByteData bytes = (await image.toByteData())!;
 
     expect(bytes.lengthInBytes, width * height * 4);
     return bytes.buffer.asUint32List();
   }
 
-  test('ColorFilter - nulls', () async {
-    final Paint paint = Paint()..colorFilter = const ColorFilter.mode(null, null);
-    expect(paint.colorFilter, null);
-
-    paint.colorFilter = const ColorFilter.matrix(null);
-    expect(paint.colorFilter, null);
-  });
-
   test('ColorFilter - mode', () async {
     final Paint paint = Paint()
       ..color = green

testing/dart/color_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/compositing_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:typed_data' show Float64List;
 import 'dart:ui';
 
@@ -292,28 +291,28 @@ void main() {
   }
 
   test('SceneBuilder does not share a layer between addRetained and push*', () {
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushOffset(0, 0, oldLayer: oldLayer as OffsetEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushOffset(0, 0, oldLayer: oldLayer as OffsetEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushTransform(Float64List(16), oldLayer: oldLayer as TransformEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushTransform(Float64List(16), oldLayer: oldLayer as TransformEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushClipRect(Rect.zero, oldLayer: oldLayer as ClipRectEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushClipRect(Rect.zero, oldLayer: oldLayer as ClipRectEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushClipRRect(RRect.zero, oldLayer: oldLayer as ClipRRectEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushClipRRect(RRect.zero, oldLayer: oldLayer as ClipRRectEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushClipPath(Path(), oldLayer: oldLayer as ClipPathEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushClipPath(Path(), oldLayer: oldLayer as ClipPathEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushOpacity(100, oldLayer: oldLayer as OpacityEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushOpacity(100, oldLayer: oldLayer as OpacityEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushBackdropFilter(ImageFilter.blur(), oldLayer: oldLayer as BackdropFilterEngineLayer);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushBackdropFilter(ImageFilter.blur(), oldLayer: oldLayer as BackdropFilterEngineLayer?);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushShaderMask(
         Gradient.radial(
           const Offset(0, 0),
@@ -322,22 +321,22 @@ void main() {
         ),
         Rect.zero,
         BlendMode.color,
-        oldLayer: oldLayer as ShaderMaskEngineLayer,
+        oldLayer: oldLayer as ShaderMaskEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
-      return builder.pushPhysicalShape(path: Path(), color: const Color.fromARGB(0, 0, 0, 0), oldLayer: oldLayer as PhysicalShapeEngineLayer, elevation: 0.0);
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
+      return builder.pushPhysicalShape(path: Path(), color: const Color.fromARGB(0, 0, 0, 0), oldLayer: oldLayer as PhysicalShapeEngineLayer?, elevation: 0.0);
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushColorFilter(
         const ColorFilter.mode(
           Color.fromARGB(0, 0, 0, 0),
           BlendMode.color,
         ),
-        oldLayer: oldLayer as ColorFilterEngineLayer,
+        oldLayer: oldLayer as ColorFilterEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushColorFilter(
         const ColorFilter.matrix(<double>[
           1, 0, 0, 0, 0,
@@ -345,28 +344,28 @@ void main() {
           0, 0, 1, 0, 0,
           0, 0, 0, 1, 0,
         ]),
-        oldLayer: oldLayer as ColorFilterEngineLayer,
+        oldLayer: oldLayer as ColorFilterEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushColorFilter(
         const ColorFilter.linearToSrgbGamma(),
-        oldLayer: oldLayer as ColorFilterEngineLayer,
+        oldLayer: oldLayer as ColorFilterEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushColorFilter(
         const ColorFilter.srgbToLinearGamma(),
-        oldLayer: oldLayer as ColorFilterEngineLayer,
+        oldLayer: oldLayer as ColorFilterEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushImageFilter(
         ImageFilter.blur(sigmaX: 10.0, sigmaY: 10.0),
-        oldLayer: oldLayer as ImageFilterEngineLayer,
+        oldLayer: oldLayer as ImageFilterEngineLayer?,
       );
     });
-    testNoSharing((SceneBuilder builder, EngineLayer oldLayer) {
+    testNoSharing((SceneBuilder builder, EngineLayer? oldLayer) {
       return builder.pushImageFilter(
         ImageFilter.matrix(Float64List.fromList(<double>[
           1, 0, 0, 0,
@@ -374,10 +373,10 @@ void main() {
           0, 0, 1, 0,
           0, 0, 0, 1,
         ])),
-        oldLayer: oldLayer as ImageFilterEngineLayer,
+        oldLayer: oldLayer as ImageFilterEngineLayer?,
       );
     });
   });
 }
 
-typedef _TestNoSharingFunction = EngineLayer Function(SceneBuilder builder, EngineLayer oldLayer);
+typedef _TestNoSharingFunction = EngineLayer Function(SceneBuilder builder, EngineLayer? oldLayer);

testing/dart/dart_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 
 import 'package:litetest/litetest.dart';

testing/dart/encoding_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 import 'dart:io';
 import 'dart:typed_data';
@@ -20,13 +19,13 @@ const Color _kGreen = Color.fromRGBO(0, 255, 0, 1.0);
 void main() {
   test('Image.toByteData RGBA format works with simple image', () async {
     final Image image = await Square4x4Image.image;
-    final ByteData data = await image.toByteData();
+    final ByteData data = (await image.toByteData())!;
     expect(Uint8List.view(data.buffer), Square4x4Image.bytes);
   });
 
   test('Image.toByteData RGBA format converts grayscale images', () async {
     final Image image = await GrayscaleImage.load();
-    final ByteData data = await image.toByteData();
+    final ByteData data = (await image.toByteData())!;
     final Uint8List bytes = data.buffer.asUint8List();
     expect(bytes, hasLength(16));
     expect(bytes, GrayscaleImage.bytesAsRgba);
@@ -34,13 +33,13 @@ void main() {
 
   test('Image.toByteData Unmodified format works with simple image', () async {
     final Image image = await Square4x4Image.image;
-    final ByteData data = await image.toByteData(format: ImageByteFormat.rawUnmodified);
+    final ByteData data = (await image.toByteData(format: ImageByteFormat.rawUnmodified))!;
     expect(Uint8List.view(data.buffer), Square4x4Image.bytes);
   });
 
   test('Image.toByteData Unmodified format works with grayscale images', () async {
     final Image image = await GrayscaleImage.load();
-    final ByteData data = await image.toByteData(format: ImageByteFormat.rawUnmodified);
+    final ByteData data = (await image.toByteData(format: ImageByteFormat.rawUnmodified))!;
     final Uint8List bytes = data.buffer.asUint8List();
     expect(bytes, hasLength(4));
     expect(bytes, GrayscaleImage.bytesUnmodified);
@@ -48,7 +47,7 @@ void main() {
 
   test('Image.toByteData PNG format works with simple image', () async {
     final Image image = await Square4x4Image.image;
-    final ByteData data = await image.toByteData(format: ImageByteFormat.png);
+    final ByteData data = (await image.toByteData(format: ImageByteFormat.png))!;
     final List<int> expected = await readFile('square.png');
     expect(Uint8List.view(data.buffer), expected);
   });

testing/dart/geometry_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:math' as math show sqrt;
 import 'dart:math' show pi;
 import 'dart:ui';

testing/dart/gradient_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';
@@ -12,7 +11,7 @@ void main() {
     expect(
       Gradient.radial(
           Offset.zero,
-          null,
+          0.0,
           <Color>[const Color(0xFFFFFFFF), const Color(0xFFFFFFFF)],
           <double>[0.0, 1.0],
           TileMode.mirror),

testing/dart/http_allow_http_connections_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.9
-
 import 'dart:async';
 import 'dart:io';
 

testing/dart/http_disallow_http_connections_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.9
-
 // FlutterTesterOptions=--disallow-insecure-connections
 
 import 'dart:async';

testing/dart/image_descriptor_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 import 'dart:io';
 import 'dart:typed_data';

testing/dart/image_dispose_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:io';
 import 'dart:typed_data';
 import 'dart:ui';
@@ -58,9 +57,9 @@ void main() {
     final Picture picture = recorder.endRecording();
 
     final Image rasterizedImage = await picture.toImage(2, 2);
-    final ByteData sourceData = await frame.image.toByteData();
-    final ByteData handleData = await handle1.toByteData();
-    final ByteData rasterizedData = await rasterizedImage.toByteData();
+    final ByteData sourceData = (await frame.image.toByteData())!;
+    final ByteData handleData = (await handle1.toByteData())!;
+    final ByteData rasterizedData = (await rasterizedImage.toByteData())!;
 
     expect(sourceData.buffer.asUint8List(), equals(handleData.buffer.asUint8List()));
     expect(sourceData.buffer.asUint8List(), equals(rasterizedData.buffer.asUint8List()));
@@ -74,17 +73,17 @@ void main() {
     final Image handle1 = frame.image.clone();
     final Image handle2 = handle1.clone();
 
-    List<StackTrace> stackTraces = frame.image.debugGetOpenHandleStackTraces();
+    List<StackTrace> stackTraces = (frame.image.debugGetOpenHandleStackTraces())!;
     expect(stackTraces.length, 3);
     expect(stackTraces, equals(handle1.debugGetOpenHandleStackTraces()));
 
     handle1.dispose();
-    stackTraces = frame.image.debugGetOpenHandleStackTraces();
+    stackTraces = (frame.image.debugGetOpenHandleStackTraces())!;
     expect(stackTraces.length, 2);
     expect(stackTraces, equals(handle2.debugGetOpenHandleStackTraces()));
 
     handle2.dispose();
-    stackTraces = frame.image.debugGetOpenHandleStackTraces();
+    stackTraces = (frame.image.debugGetOpenHandleStackTraces())!;
     expect(stackTraces.length, 1);
     expect(stackTraces, equals(frame.image.debugGetOpenHandleStackTraces()));
 

testing/dart/image_filter_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:typed_data';
 import 'dart:ui';
 
@@ -54,7 +53,7 @@ void main() {
     recorderCanvas.drawRect(const Rect.fromLTRB(1.0, 1.0, 2.0, 2.0), paint);
     final Picture picture = recorder.endRecording();
     final Image image = await picture.toImage(width, height);
-    final ByteData bytes = await image.toByteData();
+    final ByteData bytes = (await image.toByteData())!;
 
     expect(bytes.lengthInBytes, equals(width * height * 4));
     return bytes.buffer.asUint32List();
@@ -66,7 +65,7 @@ void main() {
     recorderCanvas.drawPaint(paint);
     final Picture picture = recorder.endRecording();
     final Image image = await picture.toImage(width, height);
-    final ByteData bytes = await image.toByteData();
+    final ByteData bytes = (await image.toByteData())!;
 
     expect(bytes.lengthInBytes, width * height * 4);
     return bytes.buffer.asUint32List();
@@ -91,11 +90,9 @@ void main() {
   List<ColorFilter> colorFilters() {
     // Create new color filter instances on each invocation.
     return <ColorFilter> [                        // ignore: prefer_const_constructors
-      ColorFilter.mode(null, null),               // ignore: prefer_const_constructors
       ColorFilter.mode(green, BlendMode.color),   // ignore: prefer_const_constructors
       ColorFilter.mode(red, BlendMode.color),     // ignore: prefer_const_constructors
       ColorFilter.mode(red, BlendMode.screen),    // ignore: prefer_const_constructors
-      ColorFilter.matrix(null),                   // ignore: prefer_const_constructors
       ColorFilter.matrix(grayscaleColorMatrix),   // ignore: prefer_const_constructors
       ColorFilter.linearToSrgbGamma(),            // ignore: prefer_const_constructors
       ColorFilter.srgbToLinearGamma(),            // ignore: prefer_const_constructors
@@ -199,20 +196,6 @@ void main() {
     expect(filter.toString(), originalDescription);
   });
 
-  test('ImageFilter - null color filters do not throw', () {
-    dynamic error;
-    final Paint paint = Paint();
-    try {
-      paint
-        ..color = green
-        ..imageFilter = const ColorFilter.mode(null, null);
-    } catch (e) {
-      error = e;
-    }
-
-    expect(error, isNull);
-  });
-
   test('ImageFilter - from color filters', () async {
     final Paint paint = Paint()
       ..color = green
@@ -222,30 +205,6 @@ void main() {
     expect(bytes[0], 0xFF020202);
   });
 
-  test('ImageFilter - null filter composition', () async {
-    const ImageFilter nullFilter = ColorFilter.mode(null, null);
-    const ImageFilter identityFilter = ColorFilter.matrix(identityColorMatrix);
-
-    // Verify that null filter == identity.
-    Future<void> verifyAgainst(ImageFilter filter) async {
-      final ImageFilter comp0 = ImageFilter.compose(outer: filter, inner: identityFilter);
-      final ImageFilter comp1 = ImageFilter.compose(outer: filter, inner: nullFilter);
-      final ImageFilter comp2 = ImageFilter.compose(outer: nullFilter, inner: filter);
-      final Paint paint = Paint()..color = green;
-
-      paint.imageFilter = comp0;
-      final Uint32List bytes = await getBytesForColorPaint(paint);
-
-      paint.imageFilter = comp1;
-      expect(bytes, equals(await getBytesForColorPaint(paint)));
-
-      paint.imageFilter = comp2;
-      expect(bytes, equals(await getBytesForColorPaint(paint)));
-    }
-
-    makeList().forEach(verifyAgainst);
-  });
-
   test('ImageFilter - color filter composition', () async {
     final ImageFilter compOrder1 = ImageFilter.compose(
       outer: const ColorFilter.matrix(halvesBrightnessColorMatrix),
@@ -282,13 +241,13 @@ void main() {
       ImageFilter.compose(
         outer: ImageFilter.compose(outer: makeBlur(30.0, 30.0, TileMode.mirror), inner: makeBlur(20.0, 20.0, TileMode.repeated)),
         inner: ImageFilter.compose(
-          outer: const ColorFilter.mode(null, null),
+          outer: const ColorFilter.mode(Color(0xFFABCDEF), BlendMode.color),
           inner: makeScale(10.0, 10.0),
         ),
       ).toString(),
       contains(
         'matrix([10.0, 0.0, 0.0, 0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, -0.0, -0.0, 0.0, 1.0], FilterQuality.low) -> '
-        'ColorFilter.mode(null, null) -> '
+        'ColorFilter.mode(Color(0xffabcdef), BlendMode.color) -> '
         'blur(20.0, 20.0, repeated) -> '
         'blur(30.0, 30.0, mirror)'
       ),

testing/dart/image_resize_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 import 'dart:io';
 import 'dart:typed_data';
@@ -127,7 +126,7 @@ void main() {
         blackSquare.width,
         blackSquare.height,
         PixelFormat.rgba8888,
-        (Image image) => null,
+        (Image image) {},
         targetHeight: 10,
         allowUpscaling: false,
       );
@@ -155,7 +154,7 @@ void main() {
         blackSquare.width,
         blackSquare.height,
         PixelFormat.rgba8888,
-        (Image image) => null,
+        (Image image) {},
         targetHeight: 10,
         targetWidth: 1,
         allowUpscaling: false,
@@ -184,7 +183,7 @@ class BlackSquare {
     return BlackSquare._(width, height, pixels);
   }
 
-  Future<Image> resize({int targetWidth, int targetHeight, bool allowUpscaling = false}) async {
+  Future<Image> resize({int? targetWidth, int? targetHeight, bool allowUpscaling = false}) async {
     final Completer<Image> imageCompleter = Completer<Image>();
     decodeImageFromPixels(
       pixels,

testing/dart/isolate_name_server_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 import 'dart:isolate';
 import 'dart:ui';
@@ -28,7 +27,7 @@ void isolateSpawnEntrypoint(IsolateSpawnInfo info) {
     port.send(<dynamic>[code, message]);
   }
 
-  final SendPort shared = IsolateNameServer.lookupPortByName(portName);
+  final SendPort? shared = IsolateNameServer.lookupPortByName(portName);
   if (shared == null) {
     sendHelper(kErrorCode, 'Could not find port: $portName');
     return;

testing/dart/lerp_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.10
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/locale_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/observatory/skp_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart=2.12
-
 import 'dart:async';
 import 'dart:convert';
 import 'dart:developer' as developer;

testing/dart/paragraph_builder_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/paragraph_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/path_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:typed_data' show Float64List;
 import 'dart:ui';
 
@@ -130,8 +129,7 @@ void main() {
     expect(simpleHorizontalMetrics.iterator.current.isClosed, isFalse);
     final Path simpleExtract = simpleHorizontalMetrics.iterator.current.extractPath(1.0, 9.0);
     expect(simpleExtract.getBounds(), equals(const Rect.fromLTRB(1.0, 0.0, 9.0, 0.0)));
-    final Tangent posTan = simpleHorizontalMetrics.iterator.current.getTangentForOffset(1.0);
-    expect(posTan, isNotNull);
+    final Tangent posTan = simpleHorizontalMetrics.iterator.current.getTangentForOffset(1.0)!;
     expect(posTan.position, equals(const Offset(1.0, 0.0)));
     expect(posTan.angle, equals(0.0));
 
@@ -152,7 +150,7 @@ void main() {
     // test getTangentForOffset with vertical line
     final Path simpleVerticalLine = Path()..lineTo(0.0, 10.0);
     final PathMetrics simpleMetricsVertical = simpleVerticalLine.computeMetrics()..iterator.moveNext();
-    final Tangent posTanVertical = simpleMetricsVertical.iterator.current.getTangentForOffset(5.0);
+    final Tangent posTanVertical = simpleMetricsVertical.iterator.current.getTangentForOffset(5.0)!;
     expect(posTanVertical.position, equals(const Offset(0.0, 5.0)));
     expect(posTanVertical.angle, closeTo(-1.5708, .0001)); // 90 degrees
 
@@ -160,7 +158,7 @@ void main() {
     final Path simpleDiagonalLine = Path()..lineTo(10.0, 10.0);
     final PathMetrics simpleMetricsDiagonal = simpleDiagonalLine.computeMetrics()..iterator.moveNext();
     final double midPoint = simpleMetricsDiagonal.iterator.current.length / 2;
-    final Tangent posTanDiagonal = simpleMetricsDiagonal.iterator.current.getTangentForOffset(midPoint);
+    final Tangent posTanDiagonal = simpleMetricsDiagonal.iterator.current.getTangentForOffset(midPoint)!;
     expect(posTanDiagonal.position, equals(const Offset(5.0, 5.0)));
     expect(posTanDiagonal.angle, closeTo(-0.7853981633974483, .00001)); // ~45 degrees
 
@@ -191,11 +189,11 @@ void main() {
     expect(metrics.length, 2);
     expect(metrics[0].length, 20);
     expect(metrics[0].isClosed, true);
-    expect(metrics[0].getTangentForOffset(4.0).vector, const Offset(0.0, 1.0));
+    expect(metrics[0].getTangentForOffset(4.0)!.vector, const Offset(0.0, 1.0));
     expect(metrics[0].extractPath(4.0, 10.0).computeMetrics().first.length, 6.0);
     expect(metrics[1].length, 10);
     expect(metrics[1].isClosed, false);
-    expect(metrics[1].getTangentForOffset(4.0).vector, const Offset(1.0, 0.0));
+    expect(metrics[1].getTangentForOffset(4.0)!.vector, const Offset(1.0, 0.0));
     expect(metrics[1].extractPath(4.0, 6.0).computeMetrics().first.length, 2.0);
   });
 
@@ -207,7 +205,7 @@ void main() {
     expect(metrics, isEmpty);
     expect(firstMetric.length, 10);
     expect(firstMetric.isClosed, false);
-    expect(firstMetric.getTangentForOffset(4.0).vector, const Offset(0.0, 1.0));
+    expect(firstMetric.getTangentForOffset(4.0)!.vector, const Offset(0.0, 1.0));
     expect(firstMetric.extractPath(4.0, 10.0).computeMetrics().first.length, 6.0);
 
     path..lineTo(10, 10)..lineTo(10, 0)..close();
@@ -215,7 +213,7 @@ void main() {
     expect(metrics, isEmpty);
     expect(firstMetric.length, 10);
     expect(firstMetric.isClosed, false);
-    expect(firstMetric.getTangentForOffset(4.0).vector, const Offset(0.0, 1.0));
+    expect(firstMetric.getTangentForOffset(4.0)!.vector, const Offset(0.0, 1.0));
     expect(firstMetric.extractPath(4.0, 10.0).computeMetrics().first.length, 6.0);
 
     // getting a new iterator should update us.
@@ -224,7 +222,7 @@ void main() {
     expect(newMetrics, isEmpty);
     expect(newFirstMetric.length, 40);
     expect(newFirstMetric.isClosed, true);
-    expect(newFirstMetric.getTangentForOffset(4.0).vector, const Offset(0.0, 1.0));
+    expect(newFirstMetric.getTangentForOffset(4.0)!.vector, const Offset(0.0, 1.0));
     expect(newFirstMetric.extractPath(4.0, 10.0).computeMetrics().first.length, 6.0);
   });
 }

testing/dart/plugin_utilities_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';
@@ -20,21 +19,17 @@ const Foo foo = Foo();
 void main() {
   test('PluginUtilities Callback Handles', () {
     // Top level callback.
-    final CallbackHandle hTop = PluginUtilities.getCallbackHandle(top);
-    expect(hTop, isNotNull);
+    final CallbackHandle hTop = PluginUtilities.getCallbackHandle(top)!;
     expect(hTop, notEquals(0));
     expect(PluginUtilities.getCallbackHandle(top), hTop);
-    final Function topClosure = PluginUtilities.getCallbackFromHandle(hTop);
-    expect(topClosure, isNotNull);
+    final Function topClosure = PluginUtilities.getCallbackFromHandle(hTop)!;
     expect(topClosure(), 'top');
 
     // Static method callback.
-    final CallbackHandle hGetInt = PluginUtilities.getCallbackHandle(Foo.getInt);
-    expect(hGetInt, isNotNull);
+    final CallbackHandle hGetInt = PluginUtilities.getCallbackHandle(Foo.getInt)!;
     expect(hGetInt, notEquals(0));
     expect(PluginUtilities.getCallbackHandle(Foo.getInt), hGetInt);
-    final Function getIntClosure = PluginUtilities.getCallbackFromHandle(hGetInt);
-    expect(getIntClosure, isNotNull);
+    final Function getIntClosure = PluginUtilities.getCallbackFromHandle(hGetInt)!;
     expect(getIntClosure(), 1);
 
     // Instance method callbacks cannot be looked up.

testing/dart/pubspec.yaml

@@ -14,7 +14,7 @@ publish_to: none
 # relative to this directory into //third_party/dart
 
 environment:
-  sdk: '>=2.8.0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   litetest: any

testing/dart/semantics_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:ui';
 
 import 'package:litetest/litetest.dart';

testing/dart/spirv_exception_test.dart

@@ -45,7 +45,7 @@ Stream<Uint8List> exceptionShaders() async* {
     if (entry is! File) {
       continue;
     }
-    final File file = entry as File;
+    final File file = entry;
     if (path.extension(file.path) != '.spv') {
       continue;
     }

testing/dart/task_order_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 
 import 'package:litetest/litetest.dart';

testing/dart/text_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:convert';
 import 'dart:typed_data';
 import 'dart:ui';
@@ -173,12 +172,13 @@ void testTextRange() {
 
 void testLoadFontFromList() {
   test('loadFontFromList will send platform message after font is loaded', () async {
-    final PlatformMessageCallback oldHandler = window.onPlatformMessage;
-    String actualName;
-    String message;
-    window.onPlatformMessage = (String name, ByteData data, PlatformMessageResponseCallback callback) {
+    final PlatformMessageCallback? oldHandler = window.onPlatformMessage;
+    late String actualName;
+    late String message;
+    window.onPlatformMessage = (String name, ByteData? data, PlatformMessageResponseCallback? callback) {
+      assert(data != null);
       actualName = name;
-      final Uint8List list = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
+      final Uint8List list = data!.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
       message = utf8.decode(list);
     };
     final Uint8List fontData = Uint8List(0);

testing/dart/window_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.6
 import 'dart:async';
 import 'dart:typed_data';
 import 'dart:ui';
@@ -13,7 +12,7 @@ void main() {
   test('window.sendPlatformMessage preserves callback zone', () {
     runZoned(() {
       final Zone innerZone = Zone.current;
-      window.sendPlatformMessage('test', ByteData.view(Uint8List(0).buffer), expectAsync1((ByteData data) {
+      window.sendPlatformMessage('test', ByteData.view(Uint8List(0).buffer), expectAsync1((ByteData? data) {
         final Zone runZone = Zone.current;
         expect(runZone, isNotNull);
         expect(runZone, same(innerZone));
@@ -41,7 +40,7 @@ void main() {
       const Locale.fromSubtags(languageCode: 'en'),
     ];
     // The default implementation returns null due to lack of a real platform.
-    final Locale result = window.computePlatformResolvedLocale(supportedLocales);
+    final Locale? result = window.computePlatformResolvedLocale(supportedLocales);
     expect(result, null);
   });
 }

testing/smoke_test_failure/fail_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.12
-
 import 'package:litetest/litetest.dart';
 
 void main() {