233 lines
7.9 KiB
Java
233 lines
7.9 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @summary Basic functional test of Optional
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* @author Mike Duigou
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* @run testng Basic
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*/
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import java.util.NoSuchElementException;
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import java.util.Optional;
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import static org.testng.Assert.*;
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import org.testng.annotations.Test;
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public class Basic {
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@Test(groups = "unit")
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public void testEmpty() {
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Optional<Boolean> empty = Optional.empty();
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Optional<String> presentEmptyString = Optional.of("");
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Optional<Boolean> present = Optional.of(Boolean.TRUE);
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// empty
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assertTrue(empty.equals(empty));
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assertTrue(empty.equals(Optional.empty()));
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assertTrue(!empty.equals(present));
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assertTrue(0 == empty.hashCode());
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assertTrue(!empty.toString().isEmpty());
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assertTrue(!empty.toString().equals(presentEmptyString.toString()));
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assertTrue(!empty.isPresent());
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empty.ifPresent(v -> { fail(); });
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assertSame(null, empty.orElse(null));
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RuntimeException orElse = new RuntimeException() { };
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assertSame(Boolean.FALSE, empty.orElse(Boolean.FALSE));
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assertSame(null, empty.orElseGet(()-> null));
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assertSame(Boolean.FALSE, empty.orElseGet(()-> Boolean.FALSE));
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}
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@Test(expectedExceptions=NoSuchElementException.class)
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public void testEmptyGet() {
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Optional<Boolean> empty = Optional.empty();
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Boolean got = empty.get();
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void testEmptyOrElseGetNull() {
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Optional<Boolean> empty = Optional.empty();
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Boolean got = empty.orElseGet(null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void testEmptyOrElseThrowNull() throws Throwable {
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Optional<Boolean> empty = Optional.empty();
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Boolean got = empty.orElseThrow(null);
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}
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@Test(expectedExceptions=ObscureException.class)
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public void testEmptyOrElseThrow() throws Exception {
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Optional<Boolean> empty = Optional.empty();
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Boolean got = empty.orElseThrow(ObscureException::new);
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}
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@Test(groups = "unit")
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public void testPresent() {
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Optional<Boolean> empty = Optional.empty();
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Optional<String> presentEmptyString = Optional.of("");
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Optional<Boolean> present = Optional.of(Boolean.TRUE);
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// present
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assertTrue(present.equals(present));
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assertTrue(present.equals(Optional.of(Boolean.TRUE)));
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assertTrue(!present.equals(empty));
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assertTrue(Boolean.TRUE.hashCode() == present.hashCode());
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assertTrue(!present.toString().isEmpty());
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assertTrue(!present.toString().equals(presentEmptyString.toString()));
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assertTrue(-1 != present.toString().indexOf(Boolean.TRUE.toString()));
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assertSame(Boolean.TRUE, present.get());
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try {
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present.ifPresent(v -> { throw new ObscureException(); });
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fail();
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} catch(ObscureException expected) {
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}
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assertSame(Boolean.TRUE, present.orElse(null));
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assertSame(Boolean.TRUE, present.orElse(Boolean.FALSE));
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assertSame(Boolean.TRUE, present.orElseGet(null));
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assertSame(Boolean.TRUE, present.orElseGet(()-> null));
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assertSame(Boolean.TRUE, present.orElseGet(()-> Boolean.FALSE));
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assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow( null));
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assertSame(Boolean.TRUE, present.<RuntimeException>orElseThrow(ObscureException::new));
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}
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@Test(groups = "unit")
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public void testOfNullable() {
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Optional<String> instance = Optional.ofNullable(null);
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assertFalse(instance.isPresent());
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instance = Optional.ofNullable("Duke");
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assertTrue(instance.isPresent());
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assertEquals(instance.get(), "Duke");
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}
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@Test(groups = "unit")
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public void testFilter() {
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// Null mapper function
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Optional<String> empty = Optional.empty();
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Optional<String> duke = Optional.of("Duke");
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try {
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Optional<String> result = empty.filter(null);
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fail("Should throw NPE on null mapping function");
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} catch (NullPointerException npe) {
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// expected
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}
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Optional<String> result = empty.filter(String::isEmpty);
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assertFalse(result.isPresent());
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result = duke.filter(String::isEmpty);
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assertFalse(result.isPresent());
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result = duke.filter(s -> s.startsWith("D"));
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assertTrue(result.isPresent());
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assertEquals(result.get(), "Duke");
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Optional<String> emptyString = Optional.of("");
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result = emptyString.filter(String::isEmpty);
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assertTrue(result.isPresent());
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assertEquals(result.get(), "");
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}
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@Test(groups = "unit")
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public void testMap() {
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Optional<String> empty = Optional.empty();
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Optional<String> duke = Optional.of("Duke");
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// Null mapper function
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try {
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Optional<Boolean> b = empty.map(null);
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fail("Should throw NPE on null mapping function");
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} catch (NullPointerException npe) {
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// expected
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}
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// Map an empty value
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Optional<Boolean> b = empty.map(String::isEmpty);
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assertFalse(b.isPresent());
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// Map into null
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b = empty.map(n -> null);
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assertFalse(b.isPresent());
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b = duke.map(s -> null);
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assertFalse(b.isPresent());
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// Map to value
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Optional<Integer> l = duke.map(String::length);
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assertEquals(l.get().intValue(), 4);
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}
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@Test(groups = "unit")
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public void testFlatMap() {
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Optional<String> empty = Optional.empty();
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Optional<String> duke = Optional.of("Duke");
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// Null mapper function
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try {
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Optional<Boolean> b = empty.flatMap(null);
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fail("Should throw NPE on null mapping function");
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} catch (NullPointerException npe) {
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// expected
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}
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// Map into null
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try {
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Optional<Boolean> b = duke.flatMap(s -> null);
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fail("Should throw NPE when mapper return null");
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} catch (NullPointerException npe) {
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// expected
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}
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// Empty won't invoke mapper function
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try {
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Optional<Boolean> b = empty.flatMap(s -> null);
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assertFalse(b.isPresent());
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} catch (NullPointerException npe) {
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fail("Mapper function should not be invoked");
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}
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// Map an empty value
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Optional<Integer> l = empty.flatMap(s -> Optional.of(s.length()));
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assertFalse(l.isPresent());
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// Map to value
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Optional<Integer> fixture = Optional.of(Integer.MAX_VALUE);
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l = duke.flatMap(s -> Optional.of(s.length()));
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assertTrue(l.isPresent());
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assertEquals(l.get().intValue(), 4);
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// Verify same instance
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l = duke.flatMap(s -> fixture);
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assertSame(l, fixture);
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}
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private static class ObscureException extends RuntimeException {
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}
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}
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