E2e UI Fix

UI E2E Bug Fix Command

User Input

$ARGUMENTS

Extract test number (required) from arguments. Example: /e2e-ui:fix 3 to fix bug from Test 3.

Overview

This command implements a systematic bug fix workflow for bugs discovered during E2E testing:

1. Load Bug Report: Read bug report from docs/e2e-ui/bug-report-test-N.md (English version, for AI)
2. Reproduce Bug: Verify bug exists using Playwright MCP
3. Analyze Root Cause: Use Grep, Read, Playwright MCP for analysis
4. Implement Fix: Fix the underlying issue following coding principles
5. Verify Fix: Confirm bug resolved with Playwright MCP
6. Write Test: Create Playwright test to prevent regression
7. Document: Generate bilingual fix summary

Prerequisites

• ✅ Bug report exists: docs/e2e-ui/bug-report-test-N.md (English version required)
• ✅ Playwright MCP server must be running
• ✅ Frontend server must be running

Execution Workflow

Step 1: Preparation

Load Bug Report (English version only, for AI):

• Read docs/e2e-ui/bug-report-test-N.md (English, for AI - NOT ko.md)
• Extract:
  • Reproduction steps
  • Expected vs actual behavior
  • Screenshots/evidence paths
  • Console errors
  • Priority level

Read Project Configuration:

• Read playwright.config.ts (or .js):
  • Extract base URL from webServer.url or use.baseURL
  • Extract test directory from testDir or testMatch
• Read package.json (in same directory):
  • Detect framework from dependencies: next, react, vue, etc.
• Fallback: If config not found, ask user for base URL and test directory

Error Check:

• If bug report not found → ERROR: "Bug report for Test N not found. Please run /e2e-ui:execute N first to discover bugs."

Step 2: Bug Reproduction

Use Playwright MCP to reproduce bug:

// Follow exact steps from bug report
browser_navigate: {base URL + route}
browser_type: {input selector, value}
browser_click: {button selector}
browser_snapshot: {capture state}
browser_take_screenshot: {evidence}

Verify bug exists:

• Follow reproduction steps exactly
• Compare actual behavior with expected behavior
• Take screenshots for before-fix evidence
• Capture console errors
• Document current state

If bug cannot be reproduced:

• Note in summary that bug may be already fixed
• Ask user if they want to continue or skip
• Update bug report status

Step 3: Root Cause Analysis

Analysis Steps:

1. Extract Error Details from Reproduction:

   • Error messages from console output
   • Failed assertions or unexpected behavior
   • DOM state inconsistencies from snapshots

2. Identify Related Components (use Grep):

   • Grep to find components, handlers, or functions related to bug
   • Search for error messages in codebase
   • Identify files mentioned in stack traces
   • Locate UI components involved in the flow

3. Read Source Files (targeted reading):

   • Read relevant source files identified by Grep
   • Use offset/limit for large files (only read necessary sections)
   • Focus on code paths involved in reproduction steps
   • Check state management logic
   • Review event handlers
   • Examine API calls (if applicable)

4. Find Root Cause:

   • JavaScript errors → code bugs (logic errors, typos, wrong API usage)
   • Missing elements → component rendering issues (conditional rendering bugs)
   • Wrong behavior → logic errors (incorrect calculations, state bugs)
   • Network failures → API integration issues (wrong endpoints, data format)

Tools to use:

• Grep: Find relevant code patterns and files
• Read: Examine source files (use offset/limit for efficiency)
• Playwright MCP: Verify assumptions about behavior

Document Findings:

• Record root cause
• Note affected files with line numbers
• Identify fix approach

Step 4: Fix Implementation

Implement Fix:

• Make minimal, focused changes
• Strictly follow coding principles
• Follow project coding standards
• Consider edge cases
• Add defensive checks if needed

Fix Types:

1. UI Component Bugs:

   • Fix rendering logic
   • Correct conditional rendering
   • Fix CSS/styling issues

2. Logic Errors:

   • Fix calculation errors
   • Correct validation logic
   • Fix state management

3. Integration Issues:

   • Fix API calls
   • Correct data transformations
   • Fix error handling

Quality Checks:

• Ensure fix doesn't break other features
• Check for similar issues elsewhere
• Review code quality

Step 5: Fix Verification

Use Playwright MCP to verify fix:

// Repeat reproduction steps
browser_navigate: {base URL + route}
browser_type: {input selector, value}
browser_click: {button selector}
browser_snapshot: {capture fixed state}
browser_take_screenshot: {after-fix evidence}

Verify Expected Behavior:

• Follow original test steps
• Confirm expected behavior now works
• Check no console errors
• Take screenshots for after-fix evidence
• Test edge cases

If fix verification fails:

• Return to Step 3 (Analysis)
• Document what didn't work
• Adjust fix approach

Step 6: Write Regression Test

Create Playwright Test (only after fix verified):

File Location: Use directory from playwright.config.ts (testDir or testMatch)

File Naming: Follow project pattern from testMatch (e.g., *.spec.ts, *.e2e.ts)

Test Structure:

import { test, expect } from "@playwright/test";

test.describe("Test N: {scenario name}", () => {
  test("should {expected behavior}", async ({ page }) => {
    // Navigate
    await page.goto("/route");

    // Perform actions from bug reproduction steps
    await page.fill('input[name="email"]', "test@example.com");
    await page.click('button[type="submit"]');

    // Assert expected behavior
    await expect(page.locator(".success-message")).toBeVisible();

    // Assert no errors
    // Additional assertions
  });

  // Edge case tests if needed
  test("should handle edge case", async ({ page }) => {
    // Edge case test
  });
});

Test Quality:

• Clear test description
• Follows AAA pattern (Arrange, Act, Assert)
• Includes error cases
• Has meaningful assertions
• Includes comments for clarity

Step 7: Generate Documentation

Create Bilingual Fix Summary:

Files to create:

• docs/e2e-ui/fix-summary-test-N.ko.md (Korean)
• docs/e2e-ui/fix-summary-test-N.md (English)

Update Bug Report Status:

• Add "Fixed" status to bug report
• Link to fix summary
• Add fix date

Key Rules

✅ MUST DO

• Read playwright.config.ts and package.json first for project configuration
• Read English bug report only (.md, NOT ko.md) - saves ~50% tokens
• Reproduce bug first before attempting fix
• Strictly follow coding principles when implementing fix
• Use Playwright MCP for verification (both before and after fix)
• Make minimal, focused fixes
• Verify fix works before writing test
• Write regression test in directory from playwright.config.ts
• Follow naming convention from testMatch pattern
• Create bilingual fix summary (ko.md + md)
• Take screenshots for evidence (before-fix, after-fix)
• Document root cause and solution

❌ NEVER DO

• Skip reading playwright.config.ts (primary source of truth)
• Read Korean bug report (ko.md) for AI analysis (waste of tokens - read .md only)
• Skip bug reproduction step
• Make fixes without understanding root cause
• Violate coding principles when editing code
• Write test code before verifying fix works
• Write tests outside directory specified in playwright.config
• Hardcode base URLs or test directories
• Make broad, sweeping changes
• Skip verification step
• Create single-language documentation
• Ignore edge cases in tests

🎯 Fix Quality Standards

Good Fix:

• Addresses root cause, not symptoms
• Minimal code changes
• Maintains code quality
• Doesn't break existing features
• Includes defensive checks
• Well-documented in code

Good Test:

• Reproduces original bug scenario
• Would fail before fix, pass after fix
• Tests edge cases
• Clear assertions
• Maintainable code

Fix Summary Template

Korean Version: docs/e2e-ui/fix-summary-test-N.ko.md

# 버그 수정 요약: Test N

> **수정일시**: {YYYY-MM-DD HH:mm}
> **원본 버그 리포트**: [bug-report-test-N.ko.md](./bug-report-test-N.ko.md)
> **테스트 파일**: `{path/to/test.spec.ts}`

---

## 📋 버그 요약

**우선순위**: {Critical/High/Medium}

**원본 이슈**: {버그 한 줄 설명}

---

## 🔍 재현 결과

**재현 성공 여부**: ✅ 재현됨 / ❌ 재현 안됨

**재현 단계**:

1. {단계 1}
2. {단계 2}
3. {버그 발생 지점}

**수정 전 증거**:

- 스크린샷: `{path/to/before-fix-screenshot.png}`
- 콘솔 에러:

{콘솔 에러 메시지}

---

## 🔬 근본 원인 분석

**분석 방법**: {Manual Analysis / Agent: debugger / Agent: error-detective}

**근본 원인**:

{근본 원인 상세 설명}

**영향받은 파일**:

- `{file1}`: {어떤 문제}
- `{file2}`: {어떤 문제}

**원인 카테고리**: {UI Component / Logic Error / Integration Issue / etc}

---

## 🛠️ 수정 내용

**수정 접근법**: {접근 방식 설명}

**변경된 파일**:

- `{file1}`: {변경 내용}
- `{file2}`: {변경 내용}

**주요 변경사항**:

```typescript
// Before
{코드 변경 전}

// After
{코드 변경 후}

수정 이유: {왜 이렇게 수정했는지}

✅ 수정 검증

검증 방법: Playwright MCP 브라우저 테스트

검증 단계:

1. {검증 단계 1} - ✅ 통과
2. {검증 단계 2} - ✅ 통과
3. {검증 단계 3} - ✅ 통과

수정 후 증거:

• 스크린샷: {path/to/after-fix-screenshot.png}
• 콘솔 출력: {정상 출력 확인}

예상 동작 확인: ✅ 정상 동작 확인됨

엣지 케이스 테스트:

• {엣지 케이스 1}: ✅ 통과
• {엣지 케이스 2}: ✅ 통과

🧪 회귀 테스트 작성

테스트 파일: {path/to/test.spec.ts}

테스트 커버리지:

• 원본 버그 시나리오
• 예상 동작 검증
• 엣지 케이스 {n}개

주요 assertion:

• {assertion 1}
• {assertion 2}

테스트 실행 결과: {✅ 통과 / 실행 예정}

📊 영향 범위

수정 영향 범위:

• {영향받는 기능 1}
• {영향받는 기능 2}

부작용 확인: {없음 / 다음 사항 확인 필요}

추가 테스트 권장사항:

• {권장 테스트 1}
• {권장 테스트 2}

🔑 배운 점

기술적 인사이트:

• {인사이트 1}
• {인사이트 2}

향후 예방 방법:

• {예방 방법 1}
• {예방 방법 2}

📝 메모

{추가 메모나 고려사항}

### English Version: `docs/e2e-ui/fix-summary-test-N.md`

```markdown
# Bug Fix Summary: Test N

> **Fixed**: {YYYY-MM-DD HH:mm}
> **Original Bug Report**: [bug-report-test-N.md](./bug-report-test-N.md)
> **Test File**: `{path/to/test.spec.ts}`

---

## 📋 Bug Summary

**Priority**: {Critical/High/Medium}

**Original Issue**: {one line bug description}

---

## 🔍 Reproduction Results

**Reproduced Successfully**: ✅ Yes / ❌ No

**Reproduction Steps**:

1. {step 1}
2. {step 2}
3. {bug occurs here}

**Before-Fix Evidence**:

- Screenshot: `{path/to/before-fix-screenshot.png}`
- Console Errors:

{console error messages}

---

## 🔬 Root Cause Analysis

**Analysis Method**: Direct Tools (Grep + Read + Playwright MCP)

**Root Cause**:

{detailed root cause explanation}

**Affected Files**:

- `{file1}`: {what issue}
- `{file2}`: {what issue}

**Cause Category**: {UI Component / Logic Error / Integration Issue / etc}

---

## 🛠️ Fix Implementation

**Fix Approach**: {approach explanation}

**Changed Files**:

- `{file1}`: {what changed}
- `{file2}`: {what changed}

**Key Changes**:

```typescript
// Before
{code before change}

// After
{code after change}

Rationale: {why fixed this way}

✅ Fix Verification

Verification Method: Playwright MCP Browser Testing

Verification Steps:

1. {verification step 1} - ✅ Pass
2. {verification step 2} - ✅ Pass
3. {verification step 3} - ✅ Pass

After-Fix Evidence:

• Screenshot: {path/to/after-fix-screenshot.png}
• Console Output: {clean output confirmed}

Expected Behavior Confirmed: ✅ Working as expected

Edge Cases Tested:

• {edge case 1}: ✅ Pass
• {edge case 2}: ✅ Pass

🧪 Regression Test

Test File: {path/to/test.spec.ts}

Test Coverage:

• Original bug scenario
• Expected behavior validation
• {n} edge cases

Main Assertions:

• {assertion 1}
• {assertion 2}

Test Execution Result: {✅ Pass / Pending}

📊 Impact Scope

Fix Impact:

• {affected feature 1}
• {affected feature 2}

Side Effects Check: {None / Following needs verification}

Additional Testing Recommendations:

• {recommended test 1}
• {recommended test 2}

🔑 Learnings

Technical Insights:

• {insight 1}
• {insight 2}

Prevention for Future:

• {prevention method 1}
• {prevention method 2}

📝 Notes

{additional notes or considerations}

---

## Execution Flow Summary

┌─────────────────────────────────────────┐ │ 1. Preparation │ │ - Load bug report │ │ - Read playwright.config.ts │ │ - Read package.json │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 2. Bug Reproduction │ │ - Use Playwright MCP │ │ - Follow reproduction steps │ │ - Take before-fix screenshots │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 3. Root Cause Analysis │ │ - Use Grep to find related code │ │ - Read source files (offset/limit) │ │ - Identify root cause │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 4. Fix Implementation │ │ - Make minimal changes │ │ - Follow coding principles │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 5. Fix Verification │ │ - Use Playwright MCP │ │ - Verify expected behavior │ │ - Take after-fix screenshots │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 6. Write Regression Test │ │ - Create test in testDir │ │ - Follow testMatch pattern │ │ - Include edge cases │ └────────────────┬────────────────────────┘ │ ▼ ┌─────────────────────────────────────────┐ │ 7. Documentation │ │ - Generate bilingual fix summary │ │ - Update bug report status │ │ - Report to user │ └─────────────────────────────────────────┘

---

## Completion Report Format

After fix completion, provide summary to user:

```markdown
## Bug Fix Complete: Test N

### 🐛 Original Bug

- **Priority**: {priority}
- **Issue**: {one line description}
- **Bug Report**: docs/e2e-ui/bug-report-test-N.md

### ✅ Fix Summary

- **Root Cause**: {root cause}
- **Fix Approach**: {approach}
- **Files Changed**: {count} files
  - {file1}
  - {file2}

### 🧪 Verification

- **Reproduction**: ✅ Bug reproduced successfully
- **Fix Verified**: ✅ Expected behavior now works
- **Test Written**: ✅ Regression test created

### 📝 Generated Files

- **Fix Summary**:
  - `docs/e2e-ui/fix-summary-test-N.ko.md` (Korean)
  - `docs/e2e-ui/fix-summary-test-N.md` (English)
- **Test File**: `{path/to/test.spec.ts}`

### 📸 Evidence

- Before-fix: `{screenshot-before.png}`
- After-fix: `{screenshot-after.png}`

### 🔄 Next Steps

1. Review fix implementation
2. Run full test suite to verify no regressions
3. Continue with next bug or test: `/e2e-ui:execute {N+1}`

Execute

Start working according to the guidelines above.