10. Best Practices | MASTERING UNIT TESTING USING MOCKITO AND JUNIT

Handling exceptions

Exception handling is an important part of Java coding. The Java community follows a set of best practices about exception handling. The following are the exception handling best practices for unit testing:

Do not write catch blocks to pass a unit test. Consider the following example where a Calculator program has a divide method. It takes two integers, divides, and returns a result. When divide encounters a divide by zero, the program should throw an exception. The following is the code:
```
public class Calculator {

  public int divide(int op1, int op2)  {
    return op1/op2;
  }
}
```
The following is the test:
```
@Test
public void divideByZero_throws_exception() throws Exception {
  try {
    calc.divide(1, 0);
    fail("Should not reach here");
  } catch (ArithmeticException e) {

  }
}
```
Instead of catching ArithmeticException, we can apply the JUnit 4 pattern as follows:
```
  @Test(expected = ArithmeticException.class)
  public void divideByZero_throws_exception() throws Exception...
```

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MASTERING UNIT TESTING USING MOCKITO AND JUNIT

By : Acharya

MASTERING UNIT TESTING USING MOCKITO AND JUNIT

By: Acharya

Overview of this book

Handling exceptions

MASTERING UNIT TESTING USING MOCKITO AND JUNIT

By : Acharya

MASTERING UNIT TESTING USING MOCKITO AND JUNIT

By: Acharya

Overview of this book

Handling exceptions

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