russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
79 lines
2.9 KiB
Java
79 lines
2.9 KiB
Java
/*
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* Copyright (c) 2016, 2026, 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 unit tests for java.lang.invoke.MethodHandles
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* @run junit/othervm -ea -esa test.java.lang.invoke.ConstantIdentityMHTest
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*/
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package test.java.lang.invoke;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import static java.lang.invoke.MethodHandles.*;
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import static java.lang.invoke.MethodType.*;
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import static org.junit.jupiter.api.Assertions.*;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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public class ConstantIdentityMHTest {
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private static Object[][] testZeroData() {
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return new Object[][] {
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{void.class, "()void"},
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{int.class, "()int"},
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{byte.class, "()byte"},
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{short.class, "()short"},
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{long.class, "()long"},
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{float.class, "()float"},
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{double.class, "()double"},
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{boolean.class, "()boolean"},
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{char.class, "()char"},
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{Integer.class, "()Integer"}
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};
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}
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@ParameterizedTest
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@MethodSource("testZeroData")
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public void testZero(Class<?> expectedtype, String expected) throws Throwable {
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assertEquals(expected, MethodHandles.zero(expectedtype).type().toString());
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}
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@Test
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public void testZeroNPE() {
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assertThrows(NullPointerException.class, () -> MethodHandles.zero(null));
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}
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@Test
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void testEmpty() throws Throwable {
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MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class));
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assertEquals("xy", (String)cat.invoke("x","y"));
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MethodHandle mhEmpty = MethodHandles.empty(cat.type());
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assertNull((String) mhEmpty.invoke("x", "y"));
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}
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@Test
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void testEmptyNPE() {
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assertThrows(NullPointerException.class, () -> MethodHandles.empty(null));
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}
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}
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