diff --git a/packages/flutter/lib/src/painting/alignment.dart b/packages/flutter/lib/src/painting/alignment.dart
index 6f3903406e62d..2a1365b6721a6 100644
--- a/packages/flutter/lib/src/painting/alignment.dart
+++ b/packages/flutter/lib/src/painting/alignment.dart
@@ -11,6 +11,7 @@ import 'dart:ui' as ui show lerpDouble;
import 'package:flutter/foundation.dart';
import 'basic_types.dart';
+import 'debug.dart';
/// Base class for [Alignment] that allows for text-direction aware
/// resolution.
@@ -584,7 +585,7 @@ class AlignmentDirectional extends AlignmentGeometry {
@override
Alignment resolve(TextDirection? direction) {
- assert(direction != null, 'Cannot resolve $runtimeType without a TextDirection.');
+ assert(debugCheckCanResolveTextDirection(direction, '$AlignmentDirectional'));
return switch (direction!) {
TextDirection.rtl => Alignment(-start, y),
TextDirection.ltr => Alignment(start, y),
@@ -653,7 +654,7 @@ class _MixedAlignment extends AlignmentGeometry {
@override
Alignment resolve(TextDirection? direction) {
- assert(direction != null, 'Cannot resolve $runtimeType without a TextDirection.');
+ assert(debugCheckCanResolveTextDirection(direction, '$_MixedAlignment'));
return switch (direction!) {
TextDirection.rtl => Alignment(_x - _start, _y),
TextDirection.ltr => Alignment(_x + _start, _y),
diff --git a/packages/flutter/test/painting/alignment_test.dart b/packages/flutter/test/painting/alignment_test.dart
index 815723b1934d7..e8c63f6fd3b6d 100644
--- a/packages/flutter/test/painting/alignment_test.dart
+++ b/packages/flutter/test/painting/alignment_test.dart
@@ -4,6 +4,7 @@
import 'dart:math' as math;
+import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';
@@ -350,4 +351,35 @@ void main() {
expect(AlignmentGeometry.bottomCenter, Alignment.bottomCenter);
expect(AlignmentGeometry.bottomRight, Alignment.bottomRight);
});
+
+ test('AlignmentDirectional.resolve with null TextDirection asserts', () {
+ const AlignmentDirectional alignmentDirectional = AlignmentDirectional(1.0, 2.0);
+
+ expect(
+ () => alignmentDirectional.resolve(null),
+ throwsA(
+ isFlutterError.having(
+ (FlutterError e) => e.message,
+ 'message',
+ allOf(contains('No TextDirection found.'), contains('without a Directionality ancestor')),
+ ),
+ ),
+ );
+ });
+
+ test('AlignmentDirectional.resolve with null TextDirection asserts', () {
+ const Alignment a = Alignment(5.0, 6.0);
+ const AlignmentDirectional b = AlignmentDirectional(15.0, 16.0);
+
+ expect(
+ () => a.add(b).resolve(null),
+ throwsA(
+ isFlutterError.having(
+ (FlutterError e) => e.message,
+ 'message',
+ allOf(contains('No TextDirection found.'), contains('without a Directionality ancestor')),
+ ),
+ ),
+ );
+ });
}
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