Wallet Setup

Set up MetaMask wallet extension for Web3 DApp testing.

Updated for MetaMask v13 with new UI support.

When to Use This Skill

This skill should be executed automatically at the start of testing when:

# In tests/config.yaml
web3:
  enabled: true  # <-- If this is true, run wallet-setup FIRST

Execution timing:

• Run once at test start - Before any test cases are executed
• NOT between tests - Setup only needs to run once per test session
• Automatic by web-test - The web-test skill checks config.yaml and calls this automatically

Prerequisites

1. tests/.test-env file with WALLET_PRIVATE_KEY already exists
2. tests/config.yaml exists with web3.enabled: true
3. Project research completed (web-test-research)

Quick Start

SKILL_DIR="<path-to-this-skill>"

# Step 1: Download wallet extension
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-setup

# Step 2: Initialize wallet (reads WALLET_PRIVATE_KEY from .test-env, writes WALLET_PASSWORD)
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-init --wallet --headed

How It Works

• Reads WALLET_PRIVATE_KEY from tests/.test-env
• Converts private key to 24-word mnemonic using BIP-39 algorithm
• Imports wallet using the generated mnemonic (first account = your private key's address)
• Writes WALLET_PASSWORD to tests/.test-env (auto-generated if not set)
• Private key is only used locally in Playwright browser, never exposed to AI APIs

Technical Note: The private key (256 bits) is used as entropy to generate a 24-word BIP-39 mnemonic. This mnemonic, when imported into MetaMask, creates a wallet where the first derived account corresponds exactly to the original private key.

Instructions

Step 1: Download Wallet Extension

SKILL_DIR="<path-to-this-skill>"

# Download and install MetaMask wallet extension
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-setup

What this does:

• Downloads MetaMask wallet from GitHub releases
• Extracts to ./test-output/extensions/metamask/
• Prepares extension for browser loading

Expected Output:

{
  "success": true,
  "message": "MetaMask Wallet v13.13.1 installed successfully",
  "extensionPath": "./test-output/extensions/metamask"
}

Step 2: Initialize Wallet

SKILL_DIR="<path-to-this-skill>"

# Initialize wallet (reads from .test-env automatically)
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-init --wallet --headed

What this does:

• Reads WALLET_PRIVATE_KEY from tests/.test-env
• Launches browser with wallet extension
• Imports wallet using private key
• Generates and saves WALLET_PASSWORD to .test-env
• Verifies wallet is ready

Expected Output:

{
  "success": true,
  "message": "Wallet initialization completed successfully",
  "nextStep": "Use web-test-wallet-connect to connect wallet to DApp"
}

Troubleshooting

"WALLET_PRIVATE_KEY not found in .test-env file"

The .test-env file does not exist or does not contain the private key. Ensure tests/.test-env exists with WALLET_PRIVATE_KEY before running this skill.

"Extension download failed"

Check network connection. The script downloads from GitHub releases.

"Wallet initialization failed"

1. Check if headed mode is working (display available)
2. Verify private key format (should start with 0x)
3. Check ./test-output/screenshots/ for error screenshots

"Wallet already initialized"

If wallet was previously set up, it will be unlocked automatically using the password from .test-env.

To reset:

rm -rf ./test-output/chrome-profile/
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-setup
node $SKILL_DIR/scripts/wallet-setup-helper.js wallet-init --wallet --headed

Data Storage

<project-root>/
├── tests/
│   └── .test-env        # Reads WALLET_PRIVATE_KEY, writes WALLET_PASSWORD
└── test-output/
    ├── extensions/
    │   └── metamask/    # MetaMask extension files
    ├── chrome-profile/  # Browser profile with wallet state
    └── screenshots/     # Setup screenshots for debugging

Related Skills

• web-test-research - Analyze project, detect Web3 features
• web-test-case-gen - Generates config.yaml with web3.enabled setting
• web-test-wallet-connect - Called as test case or precondition (not mandatory after setup)
• web-test - Orchestrates test execution, calls wallet-setup if web3.enabled
• web-test-cleanup - Clean up wallet data when done

Next Steps

After wallet setup is complete:

1. web-test will execute test cases from tests/test-cases.yaml
2. web-test-wallet-connect will be invoked when needed by test cases (as a test or precondition)

Notes

• Wallet setup only needs to run once per test-output directory
• Wallet state persists in chrome-profile between test runs
• Use web-test-cleanup without --keep-data to reset wallet
• Always use a test wallet with minimal funds for testing

Technical Details (MetaMask v13)

The script supports both the new MetaMask v13 UI and older versions:

New UI Flow (v13+):

1. Welcome Page: Click "I have an existing wallet"
2. Sign-in Options: Click "Import using Secret Recovery Phrase"
3. SRP Input: Single textarea (use keyboard.type() for proper event handling)
4. Password: "Create new password" + "Confirm password" + checkbox
5. Complete: Click through "Got it" / "Done" dialogs

Key Selectors (v13):

• Welcome: button:has-text("I have an existing wallet")
• Import SRP: button:has-text("Import using Secret Recovery Phrase")
• SRP Input: textarea (NOT 12 separate inputs)
• Continue: button:has-text("Continue")
• Password: input[type="password"] (2 inputs)
• Create: button:has-text("Create password")
• Account menu: [data-testid="account-menu-icon"]
• Add account: [data-testid="multichain-account-menu-popover-action-button"]
• Import account: [data-testid="multichain-account-menu-popover-add-imported-account"]
• Private key: #private-key-box