CI-Grundlagen – bei jedem Push Linting und Tests ausführen

Warum CI für Anfänger?

Scripts, die CI ausführt

// Minimal scripts your CI will call
const pkgScripts = {
  lint: "eslint .",
  test: "node test-runner.js"
};

console.log("scripts:", Object.keys(pkgScripts));
console.log("lint ->", pkgScripts.lint);
console.log("test ->", pkgScripts.test);

Pipeline-Schritte

// Simulate CI steps with prints
function runCI() {
  console.log("🔹 Checkout code");
  console.log("🔹 Use Node 20");
  console.log("🔹 Install deps with npm ci");
  console.log("🔹 Run: npm run lint");
  console.log("🔹 Run: npm test");
  console.log("✅ If all pass, mark build green");
}

runCI();

GH Actions (minimal)

// Print a minimal GitHub Actions workflow (as lines)
const gha = [
  "name: ci",
  "on: [push, pull_request]",
  "jobs:",
  "  build:",
  "    runs-on: ubuntu-latest",
  "    steps:",
  "      - uses: actions/checkout@v4",
  "      - uses: actions/setup-node@v4",
  "        with:",
  "          node-version: 20",
  "      - run: npm ci",
  "      - run: npm run lint",
  "      - run: npm test"
];

for (const l of gha) console.log(l);

Geschwindigkeit und Klarheit

// Keep CI snappy: small tests, small logs
function ciTips() {
  console.log("• Keep tests small and fast");
  console.log("• Fail early; print clear messages");
  console.log("• Cache deps (advanced later)");
  console.log("• Lint + unit tests first; more later");
}
ciTips();

Tests, die CI ausführen kann

// A tiny local test runner you can call in CI
function assertEqual(actual, expected, name) {
  if (actual === expected) console.log("✅", name);
  else console.log("❌", name, "expected:", expected, "got:", actual);
}

function add(a, b) { return a + b; }
assertEqual(add(2, 3), 5, "add adds numbers");

function isAdult(age) { return age >= 18; }
assertEqual(isAdult(18), true, "adult boundary");

Quiz zum CI-Installationsbefehl

Zusammenfassung