test(all): substitude assert.Nil by assert.NoError if useful

[gen2thomas]

Solved issues and/or description of the change

test for no error has the advantage of print out an existing error by default

Checklist

• The PR's target branch is 'hybridgroup:dev'
• New and existing unit tests pass locally with my changes (e.g. by run make test)
• No linter errors exist locally (e.g. by run make fmt_check)
• I have performed a self-review of my own code (no productive code affected)