More refactoring of backend tests

[PardhavMaradani]

Changes made in this Pull Request:

• Moved common methods to utils.py
• Fixed sending frames (InThreadIMDServer) after resume

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (185460b) to head (8b03baf).

Additional details and impacted files

Components	Coverage Δ
frontend	100.00% <ø> (ø)
backend	100.00% <ø> (ø)

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[read-the-docs-community]

Documentation build overview

📚 mdadash | 🛠️ Build #33342499 | 📁 Comparing 8b03baf against latest (185460b)

  🔍 Preview build  

1 file changed

± autosummary/mdadash.backend.kernel.core.html