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Writing Testable Code - Testing JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

Open in Course

Writing Testable Code

Design code that's easy to test

Write code that can be tested:

// Hard to test (hidden dependency)
function getPrice() {
  return fetchBasePrice() * 1.1;
}

// Testable (explicit dependency)
function getPrice(basePrice) {
  return basePrice * 1.1;
}

Pass dependencies as parameters. Avoid global state. Keep functions focused on one task.