"SimpleTest" is a testing framework for PHP, not Java. If you are looking for a simple testing framework for Java, JUnit is a popular choice. JUnit is a widely used testing framework for Java that provides a simple and easy-to-use API for writing unit tests. It is built on top of the Java programming language and can be easily integrated with popular build tools like Maven and Gradle. With JUnit, you can write test cases for individual methods or classes, and then run them to ensure that your code behaves as expected.

Here is an example of a simple JUnit test case:

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class MyTest {
    @Test
    public void testAddition() {
        int result = 2 + 2;
        assertEquals(4, result);
    }
}

In this example, the MyTest class contains a single test case called testAddition(). The test case verifies that adding 2 + 2 equals 4 by using the assertEquals() method provided by JUnit. When you run this test case, JUnit will check if the actual result of the addition is equal to the expected result (which is 4), and report a failure if the result is different.

Overall, JUnit provides a simple and powerful way to write and run unit tests for your Java code, and is a good starting point for testing in Java.