Add focused unit tests for the MikroTik parser helpers

[Robinlee0929]

Context

parsers/mikrotik_parser.py provides pure helpers for output normalization, key/value parsing, ping results, NTP state, and clock state. The repository currently has no dedicated unit-test module for these helpers.

Focused tests will protect local parsing behavior without requiring RouterOS hardware, SSH, credentials, or private lab data.

Newcomer snapshot

• Difficulty: Beginner / Intermediate
• Scope: Small
• Primary area: Python / pytest parser unit tests
• Likely files: primarily a new tests/test_mikrotik_parser.py; parser changes require a separately documented defect
• Python required: Yes
• Node/npm required: No
• Physical hardware required: No
• Live device access required: No
• Credentials required: No
• External API/provider required: No
• Task-time network access required: No, after local dependencies are installed
• Start with: python -m pytest tests/test_mikrotik_parser.py
• Before completion: run the focused parser tests, full pytest, and python network_lab.py --task report-index
• Do not change: adapters, runners, SSH/device access, credentials handling, or parser implementation unless a separate clearly documented parser defect is discovered

Dependency installation may require internet access; the access fields above describe the task after local prerequisites are installed.

Scope

Add tests/test_mikrotik_parser.py using small, synthetic RouterOS-style strings.

This issue is test-only unless a separate, clearly documented parser defect is discovered during implementation.

Acceptance criteria

• normalize_output() is covered for extra spaces, line breaks, and case normalization.
• parse_key_value_output() is covered for multiple keys and blank lines.
• parse_ping() is covered for successful, fully lost, malformed, and empty output.
• parse_ntp() is covered for synchronized and unsynchronized states.
• parse_clock() is covered for complete and missing timezone data.
• Assertions verify the existing PASS, FAIL, and WARNING contracts.
• Every fixture is synthetic and contains no credentials or private infrastructure.
• Tests import only the parser module and do not invoke adapters, runners, SSH, or device access.

Suggested starting points

• parsers/mikrotik_parser.py
• tests/test_cisco_topology_validation.py as an example of parser-oriented assertions
• New tests/test_mikrotik_parser.py

Validation

Run:

• python -m pytest tests/test_mikrotik_parser.py
• python -m pytest
• python network_lab.py --task report-index

Safety boundary

Use inline or committed synthetic text only. The tests must not read credentials, contact a device, import an execution adapter, open SSH, or require a physical MikroTik router.