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test/jdk/java/util/Optional/BasicDouble.java

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*** 30,39 **** --- 30,41 ---- */ import java.util.NoSuchElementException; import java.util.OptionalDouble; import java.util.concurrent.atomic.AtomicBoolean; + import java.util.function.DoublePredicate; + import java.util.List; import static org.testng.Assert.*; import org.testng.annotations.Test; public class BasicDouble {
*** 49,58 **** --- 51,61 ---- assertFalse(empty.equals(OptionalDouble.of(UNEXPECTED))); assertFalse(OptionalDouble.of(UNEXPECTED).equals(empty)); assertFalse(empty.equals("unexpected")); assertFalse(empty.isPresent()); + assertTrue(empty.isEmpty()); assertEquals(empty.hashCode(), 0); assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED); assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED); assertThrows(NoSuchElementException.class, () -> empty.getAsDouble());
*** 124,129 **** --- 127,148 ---- @Test(groups = "unit") public void testStreamPresent() { assertEquals(OptionalDouble.of(DOUBLEVAL).stream().toArray(), new double[] { DOUBLEVAL }); } + + @Test(groups = "unit") + public void testIsEmpty() { + OptionalDouble empty = OptionalDouble.empty(); + assertTrue(empty.isEmpty()); + OptionalDouble present = OptionalDouble.of(DOUBLEVAL); + assertFalse(present.isEmpty()); + var doubleList = List.of(1.0,2.0,3.0,4.0,5.0); + DoublePredicate isPositiveNumber = x -> x > 0; + DoublePredicate isNegativeNumber = x -> x < 0; + OptionalDouble positiveNumber = doubleList.stream().mapToDouble(Double::doubleValue).filter(isPositiveNumber).findAny(); + OptionalDouble negativeNumber = doubleList.stream().mapToDouble(Double::doubleValue).filter(isNegativeNumber).findAny(); + assertFalse(positiveNumber.isEmpty()); + assertTrue(negativeNumber.isEmpty()); + } + }
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