How would you write a good test case? Can you give an example?

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A good test case is clear, concise, and comprehensive, ensuring that a specific functionality of the application is validated. It should be easy to understand, repeatable, and traceable to requirements. Here's how to write one effectively:

✅ Key Components of a Good Test Case:

1. Test Case ID – Unique identifier (e.g., TC_001).

2. Title – A brief summary of what is being tested.

3. Preconditions – Any setup or requirements before execution.

4. Test Steps – Clear, step-by-step instructions.

5. Test Data – Inputs required for the test.

6. Expected Result – The desired outcome of the test.

7. Actual Result – Captured during execution (filled during testing).

8. Status – Pass/Fail.

9. Priority/Severity – Indicates the importance.

📝 Example Test Case:

• Test Case ID: TC_001

• Title: Login with valid credentials

• Preconditions: User is registered and the login page is accessible

• Test Steps:

  1. Navigate to the login page

  2. Enter valid username and password

  3. Click the "Login" button

• Test Data:

  • Username: testuser

  • Password: Test@123

• Expected Result:

  • User is redirected to the dashboard/home page

  • Welcome message is displayed

• Actual Result: (To be filled after execution)

• Status: (Pass/Fail)

• Priority: High

🧠 Tips:

• Use simple language.

• Avoid ambiguity.

• Make it independent — one test case per scenario.

• Reuse steps when applicable.

• Keep it maintainable and modular.

Well-written test cases help ensure effective test coverage, faster onboarding, and easier debugging.

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