Testing using JUnit in NetBeans

Hi,
I have created a following class.
public class PrintGrades {

`    ` `String strGrade=` `""` `;`

`     ` `String Method(` `int` `iMarks){`

`      ` `if` `(iMarks > ` `93` `){`

`          ` `strGrade =` `"A"` `;`

`         ` `return` `"A"` `;`

`      ` `}`

`      ` `else` `if` `(iMarks >` `83` `){`

`          `  

`          ` `return` `"B"` `;`

`      ` `}  `

`      ` `else` `if` `(iMarks > ` `73` `){`

`         ` `strGrade =` `"B"` `;`

`         ` `return` `"C"` `;`

`      ` `}`

`      ` `return` `strGrade;`

`    ` `}`

`}`

I want to test with JUnit. It develops the following code:
import org.junit.After;

`import` `org.junit.AfterClass;`

`import` `org.junit.Before;`

`import` `org.junit.BeforeClass;`

`import` `org.junit.Test;`

`import` `static` `org.junit.Assert.*;`

 

`/**`

` ` `*`

` ` `* @author HP`

` ` `*/`

`public` `class` `PrintGradesTest {`

`    `  

`    ` `public` `PrintGradesTest() {`

`    ` `}`

`    `  

`    ` `@BeforeClass`

`    ` `public` `static` `void` `setUpClass() {`

`    ` `}`

`    `  

`    ` `@AfterClass`

`    ` `public` `static` `void` `tearDownClass() {`

`    ` `}`

`    `  

`    ` `@Before`

`    ` `public` `void` `setUp() {`

`    ` `}`

`    `  

`    ` `@After`

`    ` `public` `void` `tearDown() {`

`    ` `}`

 

`    ` `/**`

`     ` `* Test of Method method, of class PrintGrades.`

`     ` `*/`

`    ` `@Test`

`    ` `public` `void` `testMethod() {`

`        ` `System.out.println(` `"Method"` `);`

`        ` `int` `iMarks = ` `0` `;`

`        ` `PrintGrades instance = ` `new` `PrintGrades();`

`        ` `String expResult = ` `""` `;`

`        ` `String result = instance.Method(iMarks);`

`        ` `assertEquals(expResult, result);`

`        ` `// TODO review the generated test code and remove the default call to fail.`

`        ` `fail(` `"The test case is a prototype."` `);`

`    ` `}`

`    `  

`}`

However, when I am executing the test, it says test failed. I changed the tester to:

public void testMethod() {

`        ` `System.out.println(` `"Method"` `);`

`        ` `int` `iMarks = ` `95` `;`

`        ` `PrintGrades instance = ` `new` `PrintGrades();`

`        ` `String expResult = ` `"A"` `;`

`        ` `String result = instance.Method(iMarks);`

`        ` `assertEquals(expResult, result);`

`        ` `// TODO review the generated test code and remove the default call to fail.`

`        ` `fail(` `"The test case is a prototype."` `);`

`    ` `}`

Some body please guide me what’s the problem.

Zulfi.