Feat: Add multi-Mostro integration tests (P4)

[grunch]

Add 18 integration tests verifying cross-component flows between MostroNodesNotifier and SettingsNotifier. Tests cover node switching with relay reset, custom node lifecycle, backward compatibility, persistence round-trips, and relay reconnection behavior.

Update MULTI_MOSTRO_SUPPORT.md Phase 4 section with implementation details, test group descriptions, and coverage summary (64 total tests across Phases 1-4).

Summary by CodeRabbit

• Documentation

  • Marked Phase 4 complete and expanded the integration testing doc with a consolidated test plan, key decisions, grouped scenarios, and updated coverage summary.

• Tests

  • Added a comprehensive integration test suite validating node switching, custom-node lifecycle, persistence across restarts, relay reconnection behavior, backwards compatibility, case handling, and multi-step end-to-end flows (coverage now 69 tests).

• Bug Fixes

  • Improved node selection and addition to treat pubkeys case-insensitively, reducing duplicate/selection errors.

[coderabbitai]

Walkthrough

Phase 4 of multi-Mostro integration testing is marked completed; a new comprehensive integration test file for MostroNodesNotifier is added, docs updated with test plans and decisions, and small code tweaks normalize pubkey handling and a comment in SettingsNotifier.

Changes

Cohort / File(s)	Summary
Documentation docs/MULTI_MOSTRO_SUPPORT.md	Phase 4 header changed to "Completed"; expanded goal, detailed test groups (23 integration tests across 7 groups), key decisions, and updated test coverage summary.
Integration Tests test/features/mostro/mostro_integration_test.dart	New comprehensive integration test suite using mocked Settings, NostrService, and in-memory SharedPreferences; covers node switching, custom-node lifecycle, backward-compat/import, relay clearing/reconnect behavior, case-insensitive pubkey handling, multi-session persistence, and robustness scenarios.
Mostro Notifier lib/features/mostro/mostro_nodes_notifier.dart	Normalize input pubkey to lowercase in selectNode and addCustomNode to ensure case-insensitive duplicate detection and selection.
Settings Notifier (minor) lib/features/settings/settings_notifier.dart	Only inline comment around Mostro instance update modified; behavior that resets blacklistedRelays and userRelays and updates mostroPublicKey remains unchanged.

Sequence Diagram(s)

(Skipped — changes are primarily tests, small normalization, and documentation; no new multi-component control flow requiring visualization.)

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

• Feat: Add multi-Mostro node data model and trusted nodes registry (P1) #436: Upstream multi-Mostro implementation and previous MostroNodesNotifier changes that these tests and small fixes build upon.
• fix: comprehensive test suite improvements and fixes #125: Adds/modifies mock/test infrastructure (e.g., MockSettingsNotifier) reused by the new integration tests.
• feat: implement automatic relay synchronization with Mostro instances #272: Changes to relay synchronization and settings persistence that the new tests validate.

Suggested reviewers

• AndreaDiazCorreia
• BraCR10
• Catrya

Poem

🐰 Hopping through mocks and memory bright,
I bind pubkeys, relays, and tests tonight.
Lowercase steps, persistence in tow,
Nodes pick up where past sessions go,
A carrot-coded cheer — hop, tests, go! 🥕

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly matches the main change: adding multi-Mostro integration tests for Phase 4, which comprises the majority of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch phase-4-integration-testing

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No actionable comments were generated in the recent review. 🎉

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@test/features/mostro/mostro_integration_test.dart`:
- Around line 467-489: The addCustomNode and selectNode paths allow case-variant
pubkeys to be treated as distinct because duplicates and selection use direct
string comparison (e.g., state.any((n) => n.pubkey == pubkey) and if (n.pubkey
== pubkey)); fix by normalizing incoming pubkey strings to a canonical form
(lowercase) before validation and before comparisons in addCustomNode and
selectNode (ensure the validator still accepts hex with /^[0-9a-fA-F]{64}$/ but
apply pubkey = pubkey.toLowerCase() at the start of both methods), so all stored
MostroNode.pubkey values and lookup keys are lowercase and
duplicate/preselection logic works correctly.

[mostronator]

Thorough integration test suite! 👏

What I like:

• 23 tests across 7 well-organized groups covering the full multi-Mostro lifecycle
• In-memory SharedPreferences mock for persistence round-trip testing is clever
• Dynamic mock ref pattern ensures state changes from updateMostroInstance() are visible to subsequent reads
• Good edge cases: malformed pubkey, empty pubkey, duplicate rejection, active node removal prevention
• Pubkey lowercase normalization in both addCustomNode and selectNode is a nice defensive fix
• Spanish comments cleaned up in settings_notifier.dart

Minor note:

• The doc says 23 tests but the summary table adds up to 23 (4+4+4+3+4+2+2) ✅ consistent

LGTM! 🚀