Java

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• cloning Java objects
• creating a proxy objects
• speeding up EJB lookups
• ZIP compressing in Java
• writing a JUnit testcase
• serializing Java objects
• using Java logger
• looking up hostnames by IP in Java
• implementing a Queue in Java
• parsing XML files (DOM)
• reading files in java

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Write a JUnit testcase in Java

JUnit is a popular testing framework. This guide shows how to write a JUnit test.

A class to be tested:

class Calculator {
    public int add(int i, int j) {
        return i + j;
    }
}
	

Rules for writing a JUnit testcase:

• the test case needs to extend junit.framework.TestCase base class
• the name of the Test methods must begin with "test" (eg: testAdd())
• the test methods must not take any arguments (eg: testAdd(String x) is wrong)
• the test methods need to have void return type
• the test methods must not throw any exceptions

Our testcase:

import junit.framework.TestCase;

class CalculatorTestCase extends TestCase {
    public void testAdd() {
        try {
            Calculator calc = new Calculator();
            int result = calc.add(1, 2);
            assertEquals(result, 3);
        } catch(Exception e) {
            fail();
        }
    }
}