78 lines
2.8 KiB
Java
78 lines
2.8 KiB
Java
/*
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* Copyright (c) 2016, 2019, 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 testng/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.testng.Assert.*;
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import org.testng.annotations.*;
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public class ConstantIdentityMHTest {
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@DataProvider(name = "testZeroData")
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private 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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@Test(dataProvider = "testZeroData")
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public void testZero(Class<?> expectedtype, String expected) throws Throwable {
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assertEquals(MethodHandles.zero(expectedtype).type().toString(), expected);
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}
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@Test(expectedExceptions={ NullPointerException.class })
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public void testZeroNPE() {
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MethodHandle mh = 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((String)cat.invoke("x","y"), "xy");
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MethodHandle mhEmpty = MethodHandles.empty(cat.type());
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assertEquals((String)mhEmpty.invoke("x","y"), null);
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}
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@Test(expectedExceptions = { NullPointerException.class })
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void testEmptyNPE() {
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MethodHandle lenEmptyMH = MethodHandles.empty(null);
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}
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}
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