Classes related to Unit testing with TestNG

TestNG1.1.java

/**
 * 
 * @author Krishna
 *
 */
public class BusinessClass {

	private int offset;

	public void init(int offset) {
		this.offset = offset;
	}

	/**
	 * Method to perform complicated add operation
	 * 
	 * @param a
	 * @param b
	 * @return
	 */
	public Integer complicatedAddOp(Integer a, Integer b) {
		// Just throw an exception if either of them are null
		if (null == a || null == b) {
			throw new IllegalArgumentException("Variables cannot be null");
		}
		return a + b;
	}

	/**
	 * Method that performs some complicated Math Op
	 * 
	 * @param a
	 * @param b
	 * @return
	 */
	public Integer complicatedMathOpBasedOnAddOp(Integer a, Integer b) {

		return complicatedAddOp(offset, complicatedAddOp(a, b));

	}
}

TestNG1.2.java

	/**
	 * Initializes suite level stuff
	 */
	@BeforeSuite
	public void initSuite() {
		// This is one time operation
		System.setProperty("addOffset", "10");
	}

	/**
	 * Init all test class level stuff
	 */
	@BeforeClass
	public void init() {
		businessClass = new BusinessClass(20);
	}

TestNG1.3.java

         /**
	 * This method tests if the business method
	 * {@link BusinessClass#complicatedAddOp(Integer, Integer)} throws an error
	 * when invoked with null in first argument
	 */
	@Test(expectedExceptions = { IllegalArgumentException.class }, groups = { "complicatedAddOp" })
	public void compliAddOpWithErrorInFirstArgTest() {
		// This method should throw an error
		businessClass.complicatedAddOp(null, 23);

	}

TestNG1.4.java

/**
	 * Tests if the method returns correct value and it only runs if the method
	 * compliAddOpWithErrorInSecondArgTest returns positive
	 */
	@Test(groups = { "complicatedAddOp" }, dependsOnMethods = "compliAddOpWithErrorInFirstArgTest")
	public void myFirstCompliAddOpTest() {
		// Invoke actual Business method and get the result
		int actual = businessClass.complicatedAddOp(10, 23);
		// Check if the returned by the actual is equal to what is expected
		Assert.assertEquals(actual, 43);
	}

TestNG1.5.java

/**
	 * This tests run only if all tests related to "complicatedAddOp" group are
	 * positive
	 */
	@Test(expectedExceptions = { IllegalArgumentException.class }, groups = "complicatedMathOp", dependsOnGroups = "complicatedAddOp")
	public void complicatedMathOpWithErrorInFirstArg() {
		// This method should throw an error
		businessClass.complicatedMathOpBasedOnAddOp(null, 23);
	}