Vuetify 3 TypeScript Tutorial Series - Part 21- wrote our first Unit Test

#wrote #unit #test ''Wrote'' ''Unit'' ''Test
Vuetify 3 TypeScript Tutorial Series - Part 21- wrote our first Unit Test

In this video, we wrote our first Unit Test.

In this video, we take a significant step forward in our development journey by writing our first unit test. As you may recall from the previous video, we created an empty TypeScript file for testing the formatDate function. Now, it's time to put it to use by implementing unit tests to ensure our function works correctly across different scenarios.

To begin, we define a test suite using the describe function, labeling it as "Unit Tests for formatDate" to provide clear context for ourselves and our teammates. Within this suite, we add multiple test cases using the it function. The first test case checks whether the function correctly formats a valid date. We define test inputs and expected outputs, ensuring that the function rearranges the date into the desired format. For example, if we input a date in the YYYY-MM-DD format, we expect the function to return it in the DD.MM.YYYY format, as commonly used in Europe.

To verify the function’s accuracy, we use the expect function to compare the actual output with the expected result. If they match, the test passes, confirming the function's correctness. However, if discrepancies arise, the test fails, signaling potential issues in our logic. To ensure robustness, we add additional test cases with different date values, including edge cases like the first of February, to confirm consistent formatting.

One of the key advantages of unit testing is identifying logic errors early. While running our tests, we notice a discrepancy between date formats used in the U.S. and Europe, prompting a correction in our implementation. This highlights why unit testing is crucial—not just to validate code functionality but also to uncover underlying logic issues before they cause problems in production.

Beyond testing valid cases, we also handle invalid inputs. We introduce a negative test case to check how the function behaves when given an incorrect date format. When an invalid date is passed, the function should return an empty string rather than producing erroneous output. This defensive programming approach ensures that unexpected inputs don’t break the application.

By running our tests using npx vitest run, we confirm that all cases pass successfully. This validation process reassures us that our function is working as intended and can handle both expected and unexpected scenarios.

Writing unit tests is more than just a best practice—it helps us refine our code, detect errors, and ensure long-term maintainability. As we continue developing this project, unit testing will remain an essential part of our workflow, enabling us to introduce changes confidently without fear of breaking existing functionality. If you found this video helpful, make sure to like, subscribe, and leave a comment with any feedback or suggestions. Stay tuned for the next video, where we’ll continue expanding our test coverage for other functions.
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#wrote #unit #test ''Wrote'' ''Unit'' ''Test

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