Then, we use JUnit's assertEquals method to confirm isLeapYear correctly returns false when provided If we refresh our test report in the browser, Click on Classes , then click on LeapYearTest we see this:.
If a test passes before you implement logic to make it pass, take a very careful look at your code. First, confirm the test itself is written correctly.
How to find leap year or not in android using year API class?
Our test does look correct. There are no syntax errors. We included the correct Test annotation.
We instantiated the required instance of LeapYear. We provided the correct arguments to assertEquals. It looks good. If the test looks good, double-check your logic. Is there anything already present in this that would make this test pass? Right now, our isLeapYear method looks like this:. We're returning either true or false depending on whether year is evenly divisible by 4.
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Alright, we can confirm that this test isn't passing incorrectly. The logic we implemented to pass the previous test simply covers this behavior too. Sometimes this will happen. When it does, just be very careful in confirming the test is passing for the right reasons. Since this behavior was actually already present, and all tests pass, we've completed the following Red, Green, Refactor steps:. Our logic is still contained in a single, DRY line of code. There isn't much room for refactoring quite yet.
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We can move to the next step. Based on the leap year criteria, the next simplest behavior is returning false for numbers divisible by , since those years cannot be leap years. If we look at the stack trace from the test report it reads: java.
This means that the test expected to receive false when running our isLeapYear method with the sample input. But it actually received true instead. Since this was not the anticipated output, the test fails. Next, let's add the minimum amount of code to pass this test. We can simply add to our existing conditional:. If we look at the report from the previous section, we can easily confirm all tests are still passing. Next, we'll double-check if we can refactor. Again, since we've been adding the smallest amount of code possible when implementing each behavior, there isn't much room for refactoring.
Since any year divisible by is a leap year, the application should return true for years divisible by Both our most current and all previous tests pass! We should have a completely green test report, and a fully functional isLeapYear method. Because we've added so little logic for each behavior, our code is already DRY. But always double-check whether you can refactor. If you can, confirm all tests pass after making changes. Now that we've built DRY, well-tested back-end logic, we can add our user interface. Since the back-end code is well-tested, if any errors occur when we launch our program we'll know the bug resides in the user interface logic.
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After all, the back-end logic is already vetted. Doesn't that make tracking down bugs so much easier? Next, add the necessary boilerplate code. We'll also import the Console class and declare an instance of it, because we'll need it to gather user input:. We'll gather the user's input and parse it from a String into an Integer :. Finally, we'll create an instance of the LeapYear class, call our isLeapYear method, and print its results for the user:. Continue to follow the "Red, Green, Refactor" workflow closely as you create Java applications. Using Behavior-Driven Development in this fashion is required for the rest of the course.
Eventually, it will become second nature! Leap Years Almost every 4 years we experience something called a "leap year". These are the 3 criteria that determine whether a year is a leap year: If a year is evenly divisible by 4 it is a leap year. If a year is divisible by it is a leap year.
March 01 2015
If a year is evenly divisible by and not divisible by it is not a leap year. Our program will use these criteria to evaluate a year, and return whether it is a leap year. Setup Before we can write tests we must set up our project. Let's do that now. The Coaching Cards are ideas and activities curated from leading authors, artists, entrepreneurs, and educators. They contain quick tips to get unstuck when on the move, or ways to guide conversation when meeting with a friend or mentor. Each element of the kit is housed in a durable folio made of recycled bonded leather. Step-by-step tools to learn anything through experience Buy Now Starter Lessons.
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