Write tests for access_request_screen_test.dart

[SatwikMohan]

What kind of change does this PR introduce?

This change included the Unittest for access_request_screen.dart

Issue Number: #2151

Fixes #2151

Did you add tests for your changes?

Yes I have added tests for SendAccessRequest Widget in the access_request_screen.dart file

Snapshots/Videos: Test coverage

Summary

Tests for access_request_screen are created for which files access_request_screen_test.dart, test_helper.dart and test_helper.mocks.dart are created and updated respectively.
The test_helper is updated for AccessRequestScreenViewModel class and correspondingly the test_helper.mocks.dart is updated on calling the build_runner command.

Does this PR introduce a breaking change?

No, this does not introduce any major changes to the codebase.

Have you read the contributing guide?

Yes, I have followed the guidelines.

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[palisadoes]

You have added a package that we don't use for mocks.

• mocktail: ^1.0.1

Use our existing standard which is mockito

Please resubmit with no changes to the packages.

Closing.