Replace `assertEqual` with `assertTupleEqual` in unit tests for verbosity
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['_The documentation is not available anymore as the PR was closed or merged._'
 'FYI I used the following regex to look for the `assertEqual` statements where the assertion was being done over a Tuple: `self.assertEqual(.*, \\(.*,)(\\)\\))$`, hope this is useful!']
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As detailed in #4419 and as suggested by @mariosasko, we could replace the `assertEqual` assertions with `assertTupleEqual` when the assertion is between Tuples, in order to make the tests more verbose.
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