src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/GraalDebugHandlersFactoryTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.core.test;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Comparator;

import org.graalvm.compiler.debug.DebugOptions;
import org.graalvm.compiler.debug.PathUtilities;
import org.graalvm.compiler.options.OptionKey;
import org.graalvm.compiler.options.OptionValues;
import org.graalvm.compiler.test.AddExports;
import org.junit.Assume;
import org.junit.Test;

@AddExports("jdk.internal.vm.compiler/org.graalvm.compiler.printer")
public class GraalDebugHandlersFactoryTest extends GraalCompilerTest {

    @Test
    public void createUniqueTest() throws Exception {
        Field maxFileNameLengthField = PathUtilities.class.getDeclaredField("MAX_FILE_NAME_LENGTH");
        try {
            maxFileNameLengthField.setAccessible(true);
        } catch (RuntimeException ex) {
            Assume.assumeFalse("If InaccessibleObjectException is thrown, skip the test, we are on JDK9", ex.getClass().getSimpleName().equals("InaccessibleObjectException"));
        }
        int maxFileNameLength = maxFileNameLengthField.getInt(null);
        Method createUniqueMethod = PathUtilities.class.getDeclaredMethod("createUnique", OptionValues.class, OptionKey.class, String.class, String.class, String.class, boolean.class);
        createUniqueMethod.setAccessible(true);
        Path tmpDir = Files.createTempDirectory(Paths.get("."), "createUniqueTest");
        OptionValues options = new OptionValues(OptionValues.asMap(DebugOptions.DumpPath, tmpDir.toString()));
        try {
            for (boolean createDirectory : new boolean[]{true, false}) {
                for (String ext : new String[]{"", ".bgv", ".graph-strings"}) {
                    for (int i = 0; i < maxFileNameLength + 5; i++) {
                        String id = new String(new char[i]).replace('\0', 'i');
                        String label = "";
                        createUniqueMethod.invoke(null, options, null, id, label, ext, createDirectory);

                        id = "";
                        label = new String(new char[i]).replace('\0', 'l');
                        createUniqueMethod.invoke(null, options, null, id, label, ext, createDirectory);
                    }
                }
            }
        } finally {
            deleteTree(tmpDir);
        }
    }

    private static void deleteTree(Path root) throws IOException {
        Files.walk(root).sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
    }
}