Unit Tests for Server App

[Rubinskiy]

Comprehensive coverage of the server app MessageProcessor's class with 25+ test cases:

• Isolation using mocks: Mocked the config module to avoid real dependencies
• Tests all methods: filterMessage, validateMessage, processChatMessage, createSystemMessage, createHistoryEndMessage, formatHistoryMessage
• Edge cases covered: Invalid inputs, boundary conditions, profanity filtering, message length limits

[Copilot]

Pull request overview

This PR introduces comprehensive unit testing for the server's MessageProcessor class and restructures the codebase into a modular architecture.

Changes:

• Added 25+ test cases for MessageProcessor covering validation, filtering, message processing, and edge cases
• Refactored server and consumer into modular architecture with separate services, utilities, and configuration
• Added performance testing infrastructure, documentation, and CI/CD improvements

Reviewed changes

Copilot reviewed 52 out of 55 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
server/tests/messageProcessor.test.js	New comprehensive test suite for MessageProcessor with 25+ test cases
server/services/messageProcessor.js	New modular MessageProcessor service extracted from monolithic code
server/services/redis.js	New Redis service with connection management and stream operations
server/services/database.js	New database service with connection pooling and message queries
server/services/chatService.js	New chat service orchestrating message handling across services
server/utils/logger.js	New centralized logging utility with color-coded output
server/config/index.js	New configuration management with environment validation
consumer/consumer.js	Refactored consumer with modular architecture and graceful shutdown
consumer/services/*	New modular consumer services (redis, database, batchProcessor)
tests/*	New performance and load testing infrastructure
package.json	Updated dependencies including Jest, Socket.io, and p-limit

Comments suppressed due to low confidence (3)

server/tests/messageProcessor.test.js:1

• This assertion will fail intermittently due to timing differences. Date.now() is called twice - once inside formatHistoryMessage and once in the test assertion - resulting in different values. Use a range check or mock Date.now() instead.
  server/services/redis.js:1
• The deprecation notice should specify which newer method to use instead. Add a reference to the recommended alternative method.
  server/package.json:1
• Using set for environment variables is Windows-specific and will fail on Unix-based systems. Use the cross-env package (already listed in devDependencies) to make the commands cross-platform: cross-env NODE_OPTIONS=--experimental-vm-modules npx jest

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[Copilot]

Pull request overview

Copilot reviewed 52 out of 55 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

sonar-project.properties:1

• Duplicate 'sonar.sources' property on lines 3 and 7. Remove the duplicate definition to avoid configuration ambiguity.

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[Copilot]

Pull request overview

Copilot reviewed 53 out of 57 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

sonar-project.properties:1

• The sonar.sources property is defined twice (lines 3 and 7). Remove the duplicate definition to avoid potential configuration conflicts.

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[Copilot]

Pull request overview

Copilot reviewed 53 out of 57 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

sonar-project.properties:1

• The sonar.sources property is duplicated on lines 3 and 7. Remove the duplicate on line 7 to avoid configuration conflicts.
  server/tests/messageProcessor.test.js:1
• This test assertion will fail due to timing issues. Date.now() will return a different value when the expectation runs compared to when the timestamp was set. Use a range check or mock Date.now() instead.

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[Copilot]

Pull request overview

Copilot reviewed 53 out of 57 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

server/tests/messageProcessor.test.js:1

• The test compares result.timestamp to Date.now() directly, which will fail due to timing differences. Use a range check or mock Date.now() instead.
  sonar-project.properties:1
• The sonar.sources property is defined twice (lines 3 and 7). Remove the duplicate declaration on line 7.

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[Copilot]

The version string is hardcoded. Consider moving it to the configuration file for easier version management.

Suggested change

	const welcomeMessage = messageProcessor.createSystemMessage('Welcome to the chat! Version 1.0.2');
	const appVersion = SERVER_CONFIG.VERSION ?? '1.0.2';
	const welcomeMessage = messageProcessor.createSystemMessage(`Welcome to the chat! Version ${appVersion}`);

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Copilot reviewed 53 out of 57 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

sonar-project.properties:1

• Duplicate sonar.sources property on lines 3 and 7. Remove the duplicate declaration to avoid configuration conflicts.

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[Copilot]

Inconsistent dependency specification format. Line 17 uses github: prefix while other dependencies use standard npm registry format. Consider using consistent format throughout.

[Copilot]

Changed workflow trigger from workflow_dispatch to automatic push on main branch. This will trigger builds on every push to main, which may increase CI costs and could deploy untested changes. Consider adding a manual approval step or keeping workflow_dispatch for production deployments.

Suggested change

	push:
	branches:
	- main
	workflow_dispatch:

[Copilot]

Pull request overview

Copilot reviewed 53 out of 57 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (4)

server/services/redis.js:1

• The deprecation warning should include information about what method should be used instead. Add a recommendation for the replacement method to help developers migrate away from this deprecated functionality.
  sonar-project.properties:1
• The sonar.sources property is duplicated on lines 3 and 7. Remove the duplicate declaration to avoid potential configuration conflicts.
  sonar-project.properties:1
• The sonar.sources property is duplicated on lines 3 and 7. Remove the duplicate declaration to avoid potential configuration conflicts.
  server/tests/messageProcessor.test.js:1
• This assertion will be flaky because Date.now() is called at test definition time, not when the method executes. The values will almost never match exactly. Use expect.any(Number) or check that the timestamp is within a reasonable range instead.

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[Copilot]

The default blockMs value of 10 milliseconds is very low and may cause excessive CPU usage from rapid polling. Consider increasing this to at least 1000ms (1 second) for better efficiency, or make it configurable based on workload requirements.

Suggested change

	async readMessages(count = 500, blockMs = 10) {
	async readMessages(count = 500, blockMs = 1000) {