How to fix Pipeline failed for branch main in Git

# Example log showing a test failure:
+ npm test

> my-app@1.0.0 test
> jest

FAIL  src/__tests__/utils.test.js
  ✕ should calculate correctly (5 ms)

Test Suites: 1 failed, 2 passed, 3 total
Tests:       1 failed, 8 passed, 9 total

error: command failed with exit code 1

# Correct structure:
image: node:18

pipelines:
  default:
    - step:
        name: Build and Test
        caches:
          - node
        script:
          - npm ci
          - npm test

  branches:
    main:
      - step:
          name: Deploy to Production
          script:
            - npm run deploy

# Wrong - branches section needs step(s):
branches:
  main:
    - npm run deploy

# Correct:
branches:
  main:
    - step:
        script:
          - npm run deploy

# Wrong - mixed indentation:
pipelines:
  default:
   - step:  # Only 1 space!
        script:
          - npm test

# Correct - consistent 2-space indentation:
pipelines:
  default:
    - step:
        script:
          - npm test

# Pull the latest code
git fetch origin
git checkout main

# Run the same commands that failed in CI
# For test failures:
npm test
# or
pytest
# or
go test ./...

# For build failures:
npm run build

# For lint failures:
npm run lint

# Run the same Docker image used in pipeline
docker run -it --rm -v $(pwd):/app -w /app node:18 bash

# Inside the container, run your commands
npm ci
npm test

// Fix the actual code
function calculateTotal(items) {
  return items.reduce((sum, item) => sum + item.price, 0); // was missing initial value
}

npm test -- --updateSnapshot
# or
jest --updateSnapshot

test('async operation', async () => {
  jest.setTimeout(10000); // Increase timeout
  const result = await slowOperation();
  expect(result).toBeDefined();
}, 10000);

// Mock API calls that may fail in CI
jest.mock('./api', () => ({
  fetchData: jest.fn().mockResolvedValue({ data: 'test' })
}));

git add .
git commit -m "fix: resolve failing tests"
git push origin main

# Check for TypeScript errors locally
npx tsc --noEmit

# Common fixes:
# - Add missing type definitions
# - Fix type mismatches
# - Install missing @types packages
npm install --save-dev @types/node

// Wrong - named vs default export mismatch
import MyComponent from './MyComponent'; // expects default export
export const MyComponent = () => {}; // but this is named export

// Fix:
export default MyComponent;
// or
import { MyComponent } from './MyComponent';

# Make sure all dependencies are listed in package.json
npm install missing-package --save

# Use npm ci in pipelines for reproducible builds
# bitbucket-pipelines.yml:
script:
  - npm ci  # Not 'npm install'
  - npm run build

# Ensure you're using the right image
image: node:18

# Or specify a custom Docker image
definitions:
  services:
    docker:
      memory: 2048  # Increase memory if needed

image: node:18

pipelines:
  default:
    - step:
        script:
          - echo "Deploying to $ENVIRONMENT"
          - npm run deploy

definitions:
  variables:
    NODE_ENV: &node_env "production"

pipelines:
  default:
    - step:
        script:
          - export NODE_ENV=*node_env
          - npm run build

script:
  # Print available environment variables (be careful not to expose secrets!)
  - printenv | grep -v PASSWORD | grep -v SECRET | grep -v KEY
  - npm run build

error: command failed with exit code 137

pipelines:
  default:
    - step:
        size: 2x  # Doubles memory from 4GB to 8GB
        script:
          - npm ci
          - npm run build

script:
  # For Jest - limit parallel workers
  - npm test -- --maxWorkers=2
  # or run sequentially
  - npm test -- --runInBand

  # For Node.js - increase heap size
  - export NODE_OPTIONS="--max-old-space-size=4096"
  - npm run build

pipelines:
  default:
    - step:
        name: Build
        script:
          - npm ci
          - npm run build
        artifacts:
          - dist/**
    - step:
        name: Test
        script:
          - npm ci
          - npm test

pipelines:
  default:
    - step:
        name: Long Running Tests
        max-time: 60  # Maximum time in minutes (default is 120)
        script:
          - npm run test:e2e

definitions:
  caches:
    npm: ~/.npm
    node: node_modules

pipelines:
  default:
    - step:
        caches:
          - npm
          - node
        script:
          - npm ci
          - npm test

pipelines:
  default:
    - parallel:
        - step:
            name: Unit Tests
            script:
              - npm run test:unit
        - step:
            name: Integration Tests
            script:
              - npm run test:integration

pipelines:
  pull-requests:
    '**':
      - step:
          name: Quick Tests Only
          script:
            - npm ci
            - npm run test:unit  # Skip slow e2e tests for PRs

script:
  # This won't fail even if npm test fails!
  - npm test | tee test-output.log

script:
  - set -o pipefail
  - npm test | tee test-output.log

script:
  # Run test and save output, failing if tests fail
  - npm test 2>&1 | tee test-output.log; test ${PIPESTATUS[0]} -eq 0

script:
  # Wrong - printf intercepts $?
  - failing-command
  - echo "Exit code: $?"  # Always shows 0!

  # Correct - combine on same line
  - set +e
  - failing-command; exit_code=$?; set -e
  - echo "Exit code: $exit_code"
  - if [ $exit_code -ne 0 ]; then exit $exit_code; fi

script:
  # This command can fail without failing the pipeline
  - npm run optional-check || true
  # This one will still fail the pipeline
  - npm test

script:
  # Retry a flaky command up to 3 times
  - |
    for i in 1 2 3; do
      npm run flaky-test && break || {
        if [ $i -lt 3 ]; then
          echo "Attempt $i failed, retrying..."
          sleep 10
        else
          echo "All attempts failed"
          exit 1
        fi
      }
    done

curl -X POST \
  -u "$BITBUCKET_USERNAME:$BITBUCKET_APP_PASSWORD" \
  "https://api.bitbucket.org/2.0/repositories/{workspace}/{repo}/pipelines/" \
  -H "Content-Type: application/json" \
  -d '{
    "target": {
      "ref_type": "branch",
      "type": "pipeline_ref_target",
      "ref_name": "main"
    }
  }'

git commit --allow-empty -m "ci: retry pipeline"
git push origin main