Fix: Replace assert pkg with the require pkg

[dmigwi]

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Description of the pull request

Use assert package (github.com/stretchr/testify/assert) whose tests outputs are dependent of each other, creates a situation where all tests crash if one of the dependent test output fails.

With require package(github.com/stretchr/testify/require) test fail gracefully without affecting other unrelated tests.

Its is also highlighted in the documentation: https://pkg.go.dev/github.com/stretchr/[email protected]/require#hdr-Assertions

The require package have same global functions as in the assert package, but instead of returning a boolean result they call t.FailNow().