<dependencies> <!-- JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13.2</version> <scope>test</scope> </dependency> </dependencies> public interface Calculator { int sum(int a, int b); } public class SimpleCalculator implements Calculator { public int sum(int a, int b) { return a + b; } } import org.junit.Test; import static org.junit.Assert.assertEquals; public class CalculatorTest { private Calculator calculator = new SimpleCalculator(); @Test public void testSum() { int result = calculator.sum(2, 3); assertEquals(5, result); } @Test public void testZeroSum() { int result = calculator.sum(0, 0); assertEquals(0, result); } @Test public void testNegativeSum() { int result = calculator.sum(-2, -3); assertEquals(-5, result); } }


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