Function assertContains

scripts/changeset.test.js:29–38

* Test helper to check if content contains expected string

(content, expected, testName)

 * Test helper to check if content contains expected string
 */
function assertContains(content, expected, testName) {
  if (!content.includes(expected)) {
    console.error(`❌ FAIL: ${testName}`);
    console.error(`   Expected to find: "${expected}"`);
    console.error(`   In content: ${content.substring(0, 200)}...`);
    return false;
  }
  console.log(`✓ PASS: ${testName}`);
  return true;
}

/**
 * Test helper to check if content does NOT contain unexpected string