69 lines
2.6 KiB
Java
69 lines
2.6 KiB
Java
/*
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* Copyright (c) 2018, 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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/*
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* @test
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* @bug 8050818
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* @run testng PredicateNotTest
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*/
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import java.util.List;
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import java.util.function.Predicate;
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import org.testng.annotations.Test;
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import static java.util.function.Predicate.not;
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import static java.util.stream.Collectors.joining;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.fail;
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@Test(groups = "unit")
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public class PredicateNotTest {
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static class IsEmptyPredicate implements Predicate<String> {
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@Override
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public boolean test(String s) {
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return s.isEmpty();
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}
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}
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public void test() {
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List<String> test = List.of(
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"A non-empty line",
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"",
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"A non-empty line",
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"",
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"A non-empty line",
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"",
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"A non-empty line",
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""
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);
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String expected = "A non-empty line\nA non-empty line\nA non-empty line\nA non-empty line";
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assertEquals(test.stream().filter(not(String::isEmpty)).collect(joining("\n")), expected);
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assertEquals(test.stream().filter(not(s -> s.isEmpty())).collect(joining("\n")), expected);
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assertEquals(test.stream().filter(not(new IsEmptyPredicate())).collect(joining("\n")), expected);
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assertEquals(test.stream().filter(not(not(not(String::isEmpty)))).collect(joining("\n")), expected);
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assertEquals(test.stream().filter(not(not(not(s -> s.isEmpty())))).collect(joining("\n")), expected);
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assertEquals(test.stream().filter(not(not(not(new IsEmptyPredicate())))).collect(joining("\n")), expected);
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}
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}
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