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[Mock Canvas] paints...arc() is missing ability to test start and end arc angles. #162317

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#162572
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[Mock Canvas] paints...arc() is missing ability to test start and end arc angles.#162317
#162572
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P2Important issues not at the top of the work lista: tests"flutter test", flutter_test, or one of our testsc: proposalA detailed proposal for a change to Flutterframeworkflutter/packages/flutter repository. See also f: labels.r: fixedIssue is closed as already fixed in a newer versionteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework team
@TahaTesser

Description

@TahaTesser
TahaTesser
opened on Jan 28, 2025

Use case

The paints..arc() is missing the ability to test start and end arc angles. You can test total arc rect but cannot test where the arc begins and ends. Testing arc drawn path is crucial. As a workaround, golden tests can be used to capture the arc start and end path visually.

flutter/packages/flutter_test/lib/src/mock_canvas.dart

Lines 968 to 987 in 9e273d5

@override
void arc({
Rect? rect,
Color? color,
double? strokeWidth,
bool? hasMaskFilter,
PaintingStyle? style,
StrokeCap? strokeCap,
}) {
_predicates.add(
_ArcPaintPredicate(
rect: rect,
color: color,
strokeWidth: strokeWidth,
hasMaskFilter: hasMaskFilter,
style: style,
strokeCap: strokeCap,
),
);
}

See the arc API for angles parameters :

https://api.flutter.dev/flutter/dart-ui/Canvas/drawArc.html

Proposal

Add ability to test arc start and end angles in paints..arc()

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    P2Important issues not at the top of the work lista: tests"flutter test", flutter_test, or one of our testsc: proposalA detailed proposal for a change to Flutterframeworkflutter/packages/flutter repository. See also f: labels.r: fixedIssue is closed as already fixed in a newer versionteam-frameworkOwned by Framework teamtriaged-frameworkTriaged by Framework team

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