No Directionality widget found

Why This Happens

In Flutter, widgets like Text, RichText, and others need to know the text direction (LTR or RTL). MaterialApp provides this automatically. If you use these widgets without a MaterialApp or Directionality ancestor (common in tests), this error occurs.

The Problem

// In a widget test without MaterialApp:
await tester.pumpWidget(Text('Hello')); // No Directionality!

The Fix

// Wrap in MaterialApp or Directionality:
await tester.pumpWidget(
  MaterialApp(home: Scaffold(body: Text('Hello'))),
);

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error: No Directionality widget found. A text-related widget has no text direction context.

2. 2

   Find the cause

   Check if the widget is used without a MaterialApp ancestor, especially in widget tests.

3. 3

   Apply the fix

   Wrap the widget in MaterialApp or Directionality(textDirection: TextDirection.ltr, child: ...).