Added unit & widget tests for splash_screen.dart.

[ayn-aval]

What kind of change does this PR introduce?

• Added unit & widget tests for canvas_screen.dart.

Issue Number:

• Fixes Add unit & widget tests for splash_screen.dart #158

Summary

• Added tests to increase code coverage.

Does this PR introduce a breaking change?

• No

Have you read the contributing guide , README.md , code of conduct?

• Yes

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[may-tas]

@ayn-aval Looks good, merging.
Thanks for participating in hacktoberfest.
keep contributing.

[ayn-aval]

Thank you for your constant guidance and support ! I truly appreciate how you made my first open-source contribution journey a valuable learning experience and an enjoyable one :) @may-tas