How to fix Pipeline failed: Job 'test' failed in Git

# Example job log showing a test failure:
$ npm test
FAIL  src/utils.test.js
  ✕ should return correct sum (5 ms)

  ● should return correct sum
    expect(received).toBe(expected)
    Expected: 5
    Received: 4

Test Suites: 1 failed, 1 total
ERROR: Job failed: exit code 1

# Pull the latest code
git fetch origin
git checkout your-branch

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

# For build failures:
npm run build
# or
make build

# For lint failures:
npm run lint
# or
eslint .

# Clear caches and reinstall
rm -rf node_modules package-lock.json
npm install
npm test

// Fix the actual code
function add(a, b) {
  return a + b; // was: return a - b;
}

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 your-branch

# Check for TypeScript errors
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';

# Install missing packages
npm install missing-package

# For monorepos, ensure you're in the right directory
cd packages/my-app
npm install

# Ensure base image exists
FROM node:18-alpine  # Use specific version

# Copy package files before code for better caching
COPY package*.json ./
RUN npm ci

COPY . .
RUN npm run build

# Wrong - YAML requires spaces, not tabs
test:
	script: npm test  # Tab character!

# Correct:
test:
  script: npm test

# Wrong:
test:
  - npm test

# Correct:
test:
  script:
    - npm test

# Correct structure:
test:
  before_script:
    - npm ci
  script:
    - npm test

# Must define stages used by jobs
stages:
  - test
  - build
  - deploy

test-job:
  stage: test  # Must be in stages list
  script:
    - npm test

# Define variables in .gitlab-ci.yml
variables:
  NODE_ENV: "test"
  DATABASE_URL: $CI_DATABASE_URL  # Use CI/CD variables

test:
  script:
    - npm test

# Use npm ci for clean installs in CI
install:
  script:
    - npm ci  # Not 'npm install'

# Or with caching:
test:
  cache:
    key:
      files:
        - package-lock.json
    paths:
      - node_modules/
  script:
    - npm ci
    - npm test

# Specify exact image version
test:
  image: node:18.17.0-alpine
  script:
    - npm ci
    - npm test

# For custom registries, authenticate first
before_script:
  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY

test:
  script:
    - npm test
  retry:
    max: 2
    when:
      - runner_system_failure
      - stuck_or_timeout_failure
      - script_failure  # For flaky tests

# Different retry for different failure types:
deploy:
  script:
    - ./deploy.sh
  retry:
    max: 1
    when:
      - runner_system_failure
      - stuck_or_timeout_failure
      # Don't retry script failures for deployment

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

/rebase

test:
  script:
    - npm test
  timeout: 30 minutes  # Default is usually 1 hour

# For very long jobs:
e2e_tests:
  script:
    - npm run test:e2e
  timeout: 2 hours

# Run tests in parallel
test:
  parallel: 4
  script:
    - npm test -- --shard=$CI_NODE_INDEX/$CI_NODE_TOTAL

# Use caching effectively
test:
  cache:
    key: $CI_COMMIT_REF_SLUG
    paths:
      - node_modules/
      - .npm/
  script:
    - npm ci --cache .npm
    - npm test

# Split into multiple jobs
test_unit:
  stage: test
  script:
    - npm run test:unit

test_integration:
  stage: test
  script:
    - npm run test:integration

# Job can fail without failing the pipeline
optional_lint:
  script:
    - npm run lint:experimental
  allow_failure: true

# Allow failure only for specific exit codes
test_new_feature:
  script:
    - npm test -- --experimental
  allow_failure:
    exit_codes:
      - 1
      - 137  # OOM killed

# Allow failure only on specific branches
staging_deploy:
  script:
    - ./deploy.sh staging
  allow_failure: true
  rules:
    - if: $CI_COMMIT_BRANCH != $CI_DEFAULT_BRANCH