ApexDelight

Assert vs Verify: What is Difference?

• apexdelight
• March 20, 2025March 20, 2025
• 0

Both assert and verify are used for validation, but they have key differences in behavior and use cases.

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1. assert (Python)

• Used for debugging and checking conditions.
• If the condition is False, it raises an AssertionError and stops execution.
• Can be disabled using the -O (optimize) flag when running Python.
• Typically used for developer debugging and internal checks.

Example:

pythonCopy codex = 10
assert x > 5, "x should be greater than 5"  # No error
assert x < 5, "x should be less than 5"  # Raises AssertionError

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2. verify (Test Automation)

• Not a built-in Python feature but commonly used in testing frameworks like Selenium.
• Unlike assert, verify does not stop execution on failure.
• Used for soft assertions (logging failures but continuing execution).

Example in Selenium (Test Automation)

pythonCopy codefrom selenium import webdriver

driver = webdriver.Chrome()
driver.get("https://example.com")

title = driver.title
if title != "Expected Title":
    print("Verification Failed: Title does not match")  # Execution continues

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Key Differences

Feature	assert (Python)	verify (Testing Frameworks)
Purpose	Debugging & error-checking	Test validation without stopping execution
Failure Handling	Stops execution (AssertionError)	Logs failure but continues execution
Can be Disabled	Yes (-O flag)	No
Common Use Case	Code validation	Automated testing (e.g., Selenium)

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When to Use What?

• Use assert for debugging and enforcing correctness in Python scripts.
• Use verify in test automation (e.g., Selenium) when you want to log failures without stopping the test.

Let me know if you need further clarification! 🚀