Do you know, Unit tests, just like Production code can be subject to bad programming ?

In today's #Python 🐍 daily we look at Test Smells 👃

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🟠 Test smells are defined as bad programming practices in unit test code.

🔵 It's not enough to just write tests, it's important to write good tests. Some of the common test smells are

{ Eager Test }

🟠 Occurs when a test method invokes several methods of the production object

🔵 This smell results in difficulties in test comprehension and maintenance

{ Magic Number Test }

🟠 Occurs when assert stmt in a test contain numeric literals (i.e., magic numbers) as params. Magic nos do not indicate meaning/purpose of the number

🔵 Should be replaced with constants/variables, thereby providing a descriptive name for the input

{ Conditional Test Logic }

🟠 Conditions within the test method will alter behavior of the test & its expected output

🔵 Bugs escape such test because test statements were not executed as a condition(s) was not met

{ Lazy Test }

🟠 Occurs when multiple test methods invoke the same method of the production object.

{ Resource Optimism }

🟠 Occurs when a test method makes an optimistic assumption that the external resource (e.g., File), utilized by the test method, exists or will always be available

{ Assertion Roulette }

🟠Occurs when a test method has multiple non-documented assertions

🔵 Multiple assertion statements without a descriptive message impacts readability/maintainability as it’s not possible to understand the reason for the failure of the test

{ Slow Tests }

🟠Occurs when tests take longer to run

🔵 It's a quality of a good test to run fast and provide instant feedback to code change

This list is compiled from testsmells.org/. Do check them out for more Smells.

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I am Jaydeep from India 🇮🇳

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