Test Doctor

Systematically fix test failures using parallel subagents with intelligent coordination, resource-aware execution, and iterative verification.

Supported Test Frameworks:

•Unit Tests: Vitest, Jest (JavaScript/TypeScript)
•E2E Tests: Playwright (browser-based)
•Server-Side Tests: .NET Test (NUnit, xUnit, MSTest for C#)

When to Use

•✅ Multiple test files failing simultaneously
•✅ Type/compilation errors blocking tests
•✅ Lint/format errors causing failures
•✅ After major refactoring or dependency updates
•✅ Pre-commit cleanup needed
•✅ Monorepos with multiple test projects
•✅ Projects with multiple test frameworks

Core Workflow

IMPORTANT: Use the TodoWrite tool throughout this workflow to track progress and ensure ALL steps are completed. Create todos at the start and update them as you progress through each phase.

Initial Task Planning

Before starting, create a comprehensive todo list:

code

TodoWrite:
1. Detect test frameworks (pending)
2. Select framework(s) to fix (pending)
3. Run test discovery (pending)
4. Calculate parallelism (pending)
5. Fix files in parallel (pending)
6. Verify all files processed (pending)
7. Run final validation (pending)
8. Check for skipped tests (pending)

Mark each todo as in_progress when starting, and completed when finished. Add file-specific todos during the fixing phase.

1. Discovery & Analysis

Auto-detect test framework and run discovery:

bash

node scripts/detect-test-environment.mjs  # Detect framework

Output: JSON array of detected frameworks (may contain multiple entries)

2. Framework Selection (if multiple detected)

If multiple test frameworks are detected, prompt the user to select which to fix.

Selection Strategy:

A. If 2-4 frameworks detected - Use AskUserQuestion with multiSelect: true:

code

Which test framework(s) would you like to fix?

Options:

•All frameworks (Recommended) - Fix all test projects sequentially
•
Individual framework entries with details (up to 3):
- •Display name and test type (e.g., ".NET Test (unit)")
- •Project root path
- •Framework variant (e.g., "xunit", "nunit")
- •Project file (if applicable)

B. If >4 frameworks detected - Show grouped, numbered list and ask for text response:

Display frameworks grouped by type:

Detected 6 test frameworks:

.NET Test (4 projects):

•WebSite.Tests.E2E (xunit)
•NTC.Data.EFCore.Tests (nunit)
•WebSite.Tests (xunit)
•WebSite.Tests.E2E (xunit)

JavaScript (2 projects): 5. Vitest (unit tests) 6. Playwright (e2e tests)

Which would you like to fix (or all)?

Store Selection: Keep the selected framework config(s) for the workflow.

Processing:

•If "All" or all selected: Process each framework sequentially (repeat steps 3-8 for each)
•If multiple selected: Process selected frameworks sequentially
•If single selected: Continue with that framework only

3. Run Discovery

Run tests and validation for the selected framework(s):

bash

node scripts/run-discovery.mjs            # Run tests + validation

Parse output to identify files with errors:

bash

node scripts/parse-validate-output.mjs table

Output: List of files sorted by error count (fix high-impact files first)

4. Calculate Parallelism

Determine optimal parallelism based on system resources and test framework:

bash

# Auto-calculates based on:
# - Vitest/Jest: 2GB per agent
# - Playwright: 5GB per agent (browser instances)
# - .NET Test: 3GB per agent
node calculate-parallelism.mjs --mem-per-agent=<framework_value>

Uses calculate-parallelism skill for resource-aware execution (2-6 parallel agents).

5. Parallel File Fixing

CRITICAL: Process ALL files with errors, not just the first one!

TodoWrite Integration: When you receive the file list, create a todo for each file:

code

TodoWrite (add to existing list):
- Fix tests/unit/auth.test.ts (5 failures) (pending)
- Fix tests/integration/api.spec.ts (3 failures) (pending)
- Fix tests/e2e/checkout.spec.ts (2 failures) (pending)
... (one todo per file)

As you spawn subagents, mark files as in_progress. When verified, mark as completed.

For each file in error list:

•

Spawn Fix Subagent (respecting MAX_PARALLEL limit):

code

Task: Fix all issues in {filename}

Context:
- File: {path}
- Framework: {detected_framework}
- Issues: {test failures, type errors, lint errors}

Requirements:
- Fix ALL issues in this file only
- Do NOT modify other files
- Follow project standards (check CLAUDE.md)
- Maintain test coverage
- Verify with: node scripts/verify-fix.mjs {file}
- Do NOT run whole-project commands (eslint ., eslint src, tsc)

Success: Zero test failures, type errors, and lint errors

•
Verify Fix:
bash
```
node scripts/verify-fix.mjs {file}
```
•
Evaluate Result:
- •✅ Success (zero errors): Mark fixed, move to next
- •⚠️ Partial (fewer errors): Retry with remaining issues (max 3 attempts)
- •❌ Failed: Escalate to user

6. Progress Verification

Verify ALL files were processed:

bash

node scripts/verify-progress.mjs initial-files.txt fixed-files.txt

If files remain, spawn subagents for remaining files.

7. Final Validation

IMPORTANT: Run this as a single sequential command directly in the main agent. Do NOT spawn subagents or use the Task tool for this step.

Run complete validation after ALL files processed:

bash

node scripts/run-final-validation.mjs

Expected: All tests passing, zero type/lint errors.

If issues remain: Identify regressions, spawn fix subagents for the specific failing files, then re-run this validation step (max 2 cycles).

8. Skipped Tests Check

After all errors fixed, check for skipped tests:

bash

node scripts/find-skipped-tests.mjs

If found, ask user if they want to fix and re-enable them.

Resource Management

Subagent Lifecycle

•Do NOT use run_in_background: true when spawning fix subagents. Always use foreground Task calls so you know exactly when each agent completes.
•Wait for ALL subagents to complete before proceeding to the next phase (e.g., all fix agents must finish before running Progress Verification or Final Validation).
•Track active agents: When spawning parallel agents, send all Task calls in a single message. The response will contain all results, confirming they are complete.
•No orphaned agents: Never move to Final Validation while fix subagents are still running.

Key Constraints

•Never exceed MAX_PARALLEL concurrent subagents
•Queue remaining files if limit reached
•
Monitor resources during execution:
- •Memory < 2GB: Pause new spawns
- •CPU load > 150%: Reduce MAX_PARALLEL by 1
- •I/O saturated: Stagger launches (10s delay)

Framework-Specific Resources

•Vitest/Jest: 2GB per agent (standard unit tests)
•Playwright: 5GB per agent (browser instances + execution)
•.NET Test: 3GB per agent (compilation + execution)

Test Framework Detection

Auto-detection via detect-test-environment.mjs:

Vitest/Jest:

•Detection: vitest, jest, or vite in package.json
•Test Command: pnpm/npm/yarn exec vitest run
•Validation: prettier (optional), eslint, tsc
•Patterns: **/*.test.ts, **/*.spec.tsx

Playwright:

•Detection: @playwright/test in package.json or playwright.config.ts
•Test Command: npx playwright test
•Validation: prettier (optional), eslint, tsc
•Patterns: **/*.spec.ts, e2e/**/*.test.ts
•Special: Higher resource usage, reduced parallelism

.NET Test:

•Detection: Microsoft.NET.Test.Sdk, NUnit3, xunit, MSTest in .csproj
•Test Command: dotnet test <project>.csproj
•Validation: dotnet format, dotnet build
•Patterns: **/*Test.cs, **/*Tests.cs

Preview Mode

Before running the full skill, preview what would be detected and fixed:

bash

# From skill directory
node preview.mjs [target-directory]

# Uses Git repository root if no directory specified
node preview.mjs

What it does:

•Detects all test frameworks in the target directory
•Runs discovery (tests + validation) - read-only analysis
•Shows files that would be fixed (sorted by error count)
•Finds skipped tests that could be re-enabled

Perfect for:

•Understanding what the skill will do before running it
•Checking if your project is supported
•Seeing which files have the most issues

Tool Coordination

•TodoWrite: Track workflow progress and file-level fixes (REQUIRED - use throughout)
•Task: Spawn parallel fix subagents with subagent_type="general-purpose"
•Bash: Run detection, test, verification scripts
•Read/Grep/Glob: Gather context before fixing

TodoWrite Examples

Phase 1 - Initial Planning:

code

1. Detect test frameworks (in_progress)
2. Select framework(s) to fix (pending)
3. Run test discovery (pending)
4. Calculate parallelism (pending)
5. Fix files in parallel (pending)
6. Verify all files processed (pending)
7. Run final validation (pending)
8. Check for skipped tests (pending)

Phase 2 - During Parallel Fixing:

code

1. Detect test frameworks (completed)
2. Select framework(s) to fix (completed)
3. Run test discovery (completed)
4. Calculate parallelism (completed)
5. Fix tests/unit/auth.test.ts (5 failures) (in_progress)
6. Fix tests/integration/api.spec.ts (3 failures) (in_progress)
7. Fix tests/e2e/checkout.spec.ts (2 failures) (pending)
8. Fix tests/unit/validation.test.ts (1 failure) (pending)
9. Verify all files processed (pending)
10. Run final validation (pending)
11. Check for skipped tests (pending)

Phase 3 - Near Completion:

code

1-8. [All file fixes] (completed)
9. Verify all files processed (completed)
10. Run final validation (in_progress)
11. Check for skipped tests (pending)

Supporting Scripts

All scripts are in scripts/ directory and work cross-platform:

Core Scripts

detect-test-environment.mjs - Auto-detect framework and config

bash

node scripts/detect-test-environment.mjs [directory]
# Outputs JSON with framework, projectRoot, config

run-discovery.mjs - Run tests + validation for discovery

bash

node scripts/run-discovery.mjs
# Saves to test-output.txt and validate-output.txt

parse-validate-output.mjs - Parse and group errors by file

bash

cat test-output.txt validate-output.txt | node scripts/parse-validate-output.mjs

verify-fix.mjs - Verify single file fix

bash

node scripts/verify-fix.mjs <file> [--json]
# Exit 0: fixed, 1: errors remain

verify-progress.mjs - Check all files processed

bash

node scripts/verify-progress.mjs initial.txt fixed.txt

run-final-validation.mjs - Final validation after all fixes

bash

node scripts/run-final-validation.mjs

find-skipped-tests.mjs - Find skipped tests

bash

node scripts/find-skipped-tests.mjs [--json]

Subagent Requirements

Each fix subagent MUST:

•Read Context: Source file, test file, related components
•Apply Standards: Check CLAUDE.md, follow best practices
•Fix Systematically: Test failures → Type errors → Lint errors
•Verify Using verify-fix.mjs: Run node scripts/verify-fix.mjs {file} to validate the fix. Do NOT run eslint ., eslint src, or any whole-project validation commands. Always target the specific file being fixed.
•Report Status: Issues fixed, issues remaining, blockers

Best Practices

DO

•✅ Calculate MAX_PARALLEL based on resources
•✅ Process ALL files in error list (not just first!)
•✅ Fix files in priority order (most issues first)
•✅ Spawn subagents in parallel (up to MAX_PARALLEL)
•✅ Verify each file individually
•✅ Run full validation at end

DON'T

•❌ Stop after fixing ONE file (process ALL!)
•❌ Exceed MAX_PARALLEL limit
•❌ Skip file-level verification
•❌ Run whole-project commands in subagents (eslint ., eslint src, tsc) — always target the specific file
•❌ Delete tests to "fix" failures
•❌ Modify multiple files per subagent

Error Handling

•Subagent Timeout: Kill, log, retry once at end of queue
•Persistent Failures: After 3 attempts, mark for manual review
•Regression Detected: Spawn targeted fix subagents (max 2 cycles)
•Memory Exhaustion: Wait for current subagents, reduce MAX_PARALLEL

Success Criteria

Skill succeeds when BOTH pass (framework-specific):

Vitest/Jest: vitest run passes + prettier + eslint + tsc passes Playwright: playwright test passes + prettier + eslint + tsc passes .NET Test: dotnet test passes + dotnet format + dotnet build passes

After success, check for skipped tests and offer to fix them.

Dependencies

•calculate-parallelism - Determines optimal parallelism based on system resources

Remember: Process ALL files with errors, not just the first one! Resource-aware execution ensures optimal performance without overwhelming the system.

Version: 1.0.0 License: MIT Author: Wayne Brantley