Fix(nodegen): test generation for sequence outputs

[TsBauer]

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

In cases where the operator returns a sequence, nodegen uses the assert_eq function instead of assert_seq_eq. This causes a compilation error.

Issue Number: #336

What is the new behavior?

nodegen generates now valid tests for those cases.

Does this introduce a breaking change?

• Yes
• No

Other information

[raphaelDkhn]

LGTM!