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Cоnsider the clаss Cаlculаtiоn belоw. It has 1 static method gcd that returns the greatest common divisor of 2 integers. Also provided is the test class TestCalculation that has all library imports and some of the methods predefined. Add a test method to test the static method of Calculation class. Ensure that your test method tests for all kinds of input combinations (use equivalence partitioning). You can assume that all necessary imports are already provided. public class Calculation { private static int gcd (int a, int b) { while (b > 0) { int temp = b; b = a% b; // % is remainder a = temp; } return a; }}import static org.junit.Assert.assertEquals; import org.junit.After; import org.junit.AfterClass; import org.junit.Before; import org.junit.BeforeClass; import org.junit.Test; public class TestCalculation { @BeforeClass public static void setUpBeforeClass() throws Exception { System.out.println("before class"); } @Before public void setUp() throws Exception { System.out.println("before"); } @After public void tearDown() throws Exception { System.out.println("after"); } @AfterClass public static void tearDownAfterClass() throws Exception { System.out.println("after class"); } }