Write widget tests for all widgets

[shraavv]

Overview

Write widget tests for all the widgets present in the project to ensure that they render and behave correctly.

Acceptance criteria

• Every widget in the project has a corresponding _test.dart file under the test directory
• Each test renders without throwing error, displays correct UI elements, responds correctly to user interactions and handles edge cases
• All test are passed when flutter test is run

Resources

Introduction to widget testing