Java Unit Test Division By Zero

When you divide by zero then you will receive javalangArithmeticExceptionclass. You can create a unit test that will accept this exception.

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If a method is supposed to throw an exception due to bad data we can test for that very easily.

Java unit test division by zero. Run the program multiple times with negative 0 and positive values for number of people. We are seeing that the test has failed because we are supplying 0 as the b value and in the rules of division it will return infinite and in programming terms its a dividing by zero exception. Firstly for integers things are pretty straightforward.

We can write a test where we expect an exception to be thrown. The default Java behavior for decimal numbers would be to return the Infinity value which always isnt what the application user expects. In this Video we are going to discuss the following Topics1 Division by ZERO in Java2 Integer Division by 03 Floating Division by 04 Arithmetic Excepti.

This example uses this to detect integer and real division by 0. Add an if statement to test the value stored in numPeople. Will throw an ArithmeticException because we are not allowed to divide by zero.

For example a divide by 0 triggers an ArithmeticException array index out-of-bound triggers an ArrayIndexOutOfBoundException which are really programming logical errors that shall be been fixed in compiled-time rather than leaving it to runtime exception handling. Add to the class a method called flawedMethod3 that contains a division by zero faults such that every test suite that achieves 100 path coverage reveals the fault and 2 it is possible to create a test suite that achieves 100 branch coverage and does not reveal the fault. Integrating with TestNG Installing the TestNG Listener.

The code float temp 5 0. We will now decorate our test method with the DivideByZero attribute so that the method will know that if the targeted method throws a Divide by zero exception then its our expected exception. Testing exceptions 2 We should add our test.

Test expectedjavalangArithmeticExceptionclass public void testDivideByZero acc acc i. This parameter takes a subclass of Throwable. In our divide method in the DivideMultiply Java class it throws an ArithmeticException if the denominator is zero since we cant divide by zero.

Dividing an integer by zero will result in an ArithmeticException. What is the value of 1 2. Dont forget curly braces around the 4 lines for computing and printing slicesPerPerson and leftoverSlices.

Division by 0 in your program. To do this we put the class file of the expected exception in parentheses right after the Test annotation. The program should no longer result in a.

All the other exception are called checked exceptions. We can verify if this code throws an exception by adding the expected exception to the expected parameter of the Test annotation. AssertThrows ArithmeticExceptionclass - int result 12 0.

If the denominator is zero it throws an Exception public double divide int num int denom if denom 0 throw new ArithmeticExceptionCannot divide by zero. You might think the answer is 05 but its actually 0 because Java truncates the decimal remainder. The only interesting thing about the code is the divide method which throws an exception if we divide by zero.

If this reaches 0 the program crashes. This section outlines how to install the SpiraTest Listener for TestNG onto a workstation so that you can then run automated TestNG unit tests against a Java application and have the results be recorded as test runs inside SpiraTest. A count of the number of times the exception is allowed is decremented each time the exception occurs.

If it is greater than 0 the program continues and XCPNOTED exception returns true. Else return numdoubledenom. AssertThrows ArithmeticExceptionclass - int result 0 0.

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