What is the use of assertions in automated test scripts?

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Assertions in automated test scripts are used to validate the expected behavior of an application by comparing actual results with expected outcomes. They serve as checkpoints that determine whether a test has passed or failed.

🔍 Purpose of Assertions:

1. Verify Output: Ensure that the application behaves as intended after specific actions.

2. Detect Failures Early: Immediately flag deviations from expected results, helping catch bugs quickly.

3. Automate Validation: Enable tests to run without manual inspection, improving test efficiency and reliability.

4. Maintain Code Quality: Consistent assertion checks help enforce application correctness across builds.

🛠️ How Assertions Work:

An assertion typically takes two values—expected and actual—and checks if they match. If not, the test fails and logs the discrepancy.

✅ Common Assertions:

• assert Equals(expected, actual)

• assert True(condition)

• assert False(condition)

• assert Not Null(object)

• assert Throws(expected Exception, code Block)

💡 Benefits:

• Helps pinpoint where and why a test fails.

• Encourages clear, concise, and goal-oriented test design.

• Integrates with CI/CD pipelines for automated validation.

In summary, assertions are essential for confirming that your application behaves correctly under test conditions, making them a cornerstone of effective automated testing.

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