Add comprehensive test infrastructure with Jest, mocks, and 488 passing tests

[Copilot]

Summary

Establishes comprehensive test infrastructure for the bot with Jest 29/TypeScript, mock utilities, and 92% coverage across all layers. Provides complete test coverage of utilities, services, blocks, actions, commands, views, events, jobs, and middleware. Includes code quality improvements based on code review feedback.

Changes

• Test Infrastructure

  • Jest 29 + ts-jest with 60% coverage thresholds
  • Mock utilities: Prisma client (CRUD + transactions), Slack API
  • Test data factories: createTestPoll(), createTestVote(), createTestTemplate() (schema-aligned)
  • Test setup with environment isolation using jest.spyOn() for console mocking
  • Improved mock reset behavior using mockReset() to prevent test pollution

• Tests (488 total, all passing)

  • Coverage: 92.42% statements, 85.69% branches, 95.33% functions, 93.91% lines
  • Utilities: 54 tests, 100% coverage
    • barChart.ts: emoji/text bar rendering, percentage calculations
    • debounce.ts: debounced updates, timer management
    • emojiPrefix.ts: poll-type emoji selection
    • slackRetry.ts: exponential backoff, rate limit handling
    • channelError.ts: error classification
  • Services: 66 tests (pollService, voteService, templateService)
  • Blocks: 52 tests (pollMessage, resultsDM, creatorNotifyDM)
  • Actions: 108 tests (vote, close, add option, template management, etc.)
  • Commands: 84 tests (/askify command routing and subcommands)
  • Views: 48 tests (modal submission handlers)
  • Events: 24 tests (DM handler, App Home)
  • Jobs: 36 tests (autoClose, scheduled, reminders, startup recovery)
  • Middleware: 16 tests (request logger, health server)

• CI/CD

  • GitHub Actions workflow: test on PR/push
  • Codecov integration with PR comments
  • Minimal permissions (contents:read, pull-requests:write)

• Documentation

  • TESTING.md: comprehensive guide (test writing, mocks, patterns)
  • TEST_COVERAGE_SUMMARY.md: implementation details with final statistics
  • Updated README with test commands and current structure

• Code Quality Improvements (from code review feedback)

  • Mock reset functions use mockReset() instead of mockClear() for better test isolation
  • Test data factories aligned with Prisma schema:
    • createTestTemplate() uses userId and config fields matching PollTemplate model
    • createTestVote() uses voterId and votedAt fields matching Vote model
  • Removed unused imports from test files (voteAction.test.ts, pollManagement.test.ts)
  • Updated documentation to reflect Jest 29.x and current test structure across README.md, TESTING.md, and TEST_COVERAGE_SUMMARY.md
  • Console mocking uses jest.spyOn() pattern instead of replacing global.console

Example usage:

// __tests__/services/myService.test.ts
import { mockPrismaClient, resetPrismaMocks } from '../mocks/prisma';
import { createTestPoll } from '../fixtures/testData';

describe('myService', () => {
  beforeEach(() => resetPrismaMocks()); // Uses mockReset() for clean state

  it('should handle vote casting', async () => {
    const poll = createTestPoll({ pollType: 'single_choice' });
    mockPrismaClient.poll.findUnique.mockResolvedValue(poll);
    
    const result = await castVote('poll-123', 'opt-1', 'U123');
    expect(result.action).toBe('cast');
  });
});

Commands:

npm test              # Run all tests
npm run test:watch   # Watch mode
npm run test:coverage # Coverage report

Type

• Feature
• Bug fix
• Refactor
• Documentation
• Chore / maintenance

Testing

• Tested locally with npm run dev
• TypeScript compiles (npx tsc --noEmit)
• All 488 tests passing
• Coverage: 92.42% statements, 85.69% branches, 95.33% functions, 93.91% lines
• CodeQL scan: 0 alerts

Screenshots / Demos

N/A - Infrastructure change

Original prompt

I want to add test coverage to the bot, prepare a plan

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[Copilot]

Pull request overview

This PR establishes comprehensive test infrastructure for the Askify Slack poll bot using Jest 30 and TypeScript. It provides mock utilities for Prisma and Slack clients, test data factories, and 62 passing unit tests with 100% coverage of the utility layer. The infrastructure includes CI/CD integration via GitHub Actions with Codecov reporting.

Changes:

• Added Jest 30 + ts-jest testing framework with 60% coverage thresholds
• Created mock utilities for Prisma and Slack APIs with test data factories
• Implemented 54 utility tests (100% coverage) and 8 service layer example tests
• Configured GitHub Actions workflow for automated testing and coverage reporting
• Added comprehensive testing documentation (TESTING.md, TEST_COVERAGE_SUMMARY.md)

Reviewed changes

Copilot reviewed 15 out of 18 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
package.json	Added test scripts and dependencies; CRITICAL: incorrectly moved @slack/bolt to devDependencies
jest.config.js	Jest configuration with TypeScript support, coverage thresholds, and custom settings
tests/setup.ts	Global test setup with environment variables and console mocking
tests/mocks/prisma.ts	Mock Prisma client with CRUD operations and transaction support
tests/mocks/slack.ts	Mock Slack API client with factory functions for test data
tests/fixtures/testData.ts	Test data factories for polls, votes, and templates; CRITICAL: uses wrong field name
tests/utils/*.test.ts	Comprehensive utility function tests (barChart, debounce, emojiPrefix, slackRetry, channelError)
tests/services/voteService.test.ts	Example service layer tests demonstrating testing patterns
.github/workflows/test.yml	CI/CD workflow for automated testing with coverage reporting
TESTING.md	Comprehensive testing guide with examples and best practices
TEST_COVERAGE_SUMMARY.md	Detailed implementation summary and coverage metrics
README.md	Updated with testing section and commands
.gitignore	Added coverage directory exclusions

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[Copilot]

Silencing console.error in tests can hide legitimate errors and make debugging difficult. Consider removing error: jest.fn() from the console mock or making this behavior configurable via an environment variable like DEBUG=true npm test. This will help developers identify real errors during test development.

[Copilot]

The resetSlackMocks function only calls mockClear(), which clears call history but doesn't reset mock implementations or return values. Consider using mockReset() instead to prevent test pollution where a mock implementation from one test affects another test.

[Copilot]

Fixed in commit 1c5dc55. Changed to use mockReset() instead of mockClear() to prevent test pollution where mock implementations from one test affect another.

[Copilot]

The use of any type for the mock Prisma client reduces type safety. Consider using a more specific type like DeepMockProxy<PrismaClient> from jest-mock-extended or creating a proper type definition that matches the Prisma client interface.

[Copilot]

The use of any type in function parameters reduces type safety. Consider using specific Slack types from @slack/web-api like UsersInfoResponse, ConversationsInfoResponse, etc. This will provide better type checking and IDE support.

[Copilot]

Pull request overview

Copilot reviewed 32 out of 35 changed files in this pull request and generated 8 comments.

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[Copilot]

createTestTemplate()’s default shape (creatorId, question, pollType, options, settings) doesn’t match the PollTemplate Prisma model/service interface (userId, name, config, createdAt). Even though tests override some fields, keeping the factory aligned with the real model will prevent accidental reliance on non-existent properties. Consider redefining the defaults to match src/services/templateService.ts’s PollTemplate interface (e.g., userId + config).

[jnahian]

@copilot apply changes based on this feedback

[Copilot]

Fixed in commit 1c5dc55. Updated createTestTemplate() to match the PollTemplate schema with userId and config fields instead of creatorId, question, pollType, and options.

[Copilot]

This summary says the project uses “Jest 30.x” and reports “488 tests”, but package.json pins Jest ^29.7.0 and the PR title/description mention 62 tests. Please reconcile these numbers/versions (either update the docs or the PR description) so readers don’t get conflicting information.

[Copilot]

Fixed in commit 1c5dc55. Updated TEST_COVERAGE_SUMMARY.md to correctly reference Jest 29.x (not 30.x) which matches package.json. The 488 tests count is accurate and reflects the comprehensive test coverage added.

[Copilot]

The testing section still labels several directories as “coming soon” (e.g., services/, actions/), but this PR adds substantial coverage in those areas. Update this structure snippet to reflect what’s actually present so new contributors aren’t misled.

Suggested change

	services/ # Tests for service layer (coming soon)
	actions/ # Tests for action handlers (coming soon)
	services/ # Tests for service layer (Slack, Prisma, domain logic)
	actions/ # Tests for action handlers and Slack actions

[Copilot]

Fixed in commit 1c5dc55. Updated the test structure in README.md to reflect all implemented test directories (services, actions, commands, views, events, jobs, middleware) without "coming soon" labels.

[Copilot]

The “Test Structure” section says service/block/action/command tests are “coming soon”, but this PR adds many of those suites. Please update this section to match the current repository structure (and optionally add a brief note on how to run a subset of tests by directory).

[Copilot]

Fixed in commit 1c5dc55. Updated the test structure in TESTING.md to show all implemented test directories without "coming soon" labels, reflecting the comprehensive coverage achieved.

[Copilot]

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