Cover integrations tests for all app

We need to create integrations tests for all the commons scenarios of the app, with intergraiton_test package: https://github.com/flutter/flutter/tree/master/packages/integration_test.

More information here: https://docs.flutter.dev/testing/integration-tests

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This package seems to be very interresting, have to dig: https://pub.dev/packages/convenient_test

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