chore: format node unit tests with black

[Subhrasameerdash]

Description:
Format node unit tests with Black for consistent style.

Run Black on tests/unit/node*.py

Related issue(s):

Fixes #1545

Notes for reviewer:

Checklist

[coderabbitai]

Walkthrough

This pull request applies Black code formatter standardization to four test files in the test suite (node_address_test.py, node_create_transaction_test.py, node_tls_test.py, node_update_transaction_test.py) to improve code consistency. No functional or behavioral changes are introduced.

Changes

Cohort / File(s)	Summary
Black formatting applied to test files tests/unit/node_address_test.py, tests/unit/node_create_transaction_test.py, tests/unit/node_tls_test.py, tests/unit/node_update_transaction_test.py	Formatting standardization: multiline import restructuring, string literal quote normalization (single to double quotes), addition of trailing commas, reflowing of constructor calls and assertions across multiple lines, indentation adjustments, and whitespace consistency. No changes to test logic or assertions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: formatting node unit tests using Black, which matches the changeset.
Description check	✅ Passed	The description is related to the changeset, explaining the purpose of running Black on node test files and referencing the linked issue.
Linked Issues check	✅ Passed	The PR implements the core requirement from issue #1545: formatting tests/unit/node*.py files with Black. All four affected test files show only formatting changes with no functional modifications.
Out of Scope Changes check	✅ Passed	All changes are within scope—only formatting modifications to node unit test files as specified in issue #1545. No unrelated code changes detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[Copilot]

Pull request overview

This PR applies Black code formatting to node-related unit test files to ensure consistent code style across the test suite.

Changes:

• Formatted tests/unit/node*.py files with Black formatter
• Applied line breaking, quote normalization, trailing commas, and whitespace cleanup
• No logic or functionality changes

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/unit/node_update_transaction_test.py	Applied Black formatting: line breaks for long assert statements, trailing commas
tests/unit/node_tls_test.py	Applied Black formatting: quote normalization, whitespace cleanup, line breaks, parenthesized context managers
tests/unit/node_create_transaction_test.py	Applied Black formatting: line breaks for long assert statements
tests/unit/node_address_test.py	Applied Black formatting: quote normalization, line breaks, trailing commas, blank lines

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[coderabbitai]

Actionable comments posted: 1

[manishdait]

Thanks for the PR, @Subhrasameerdash. Please add a corresponding entry to CHANGELOG.md under ## Test.