/*

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import org.testng.annotations.Test;

import java.util.regex.Pattern;

import jdk.test.lib.OutputAnalyzer;

import jdk.test.lib.dcmd.CommandExecutor;

import jdk.test.lib.dcmd.JMXExecutor;

/*

 * @test

 * @summary Test of diagnostic command GC.class_histogram

 * @library /testlibrary

 * @modules java.base/jdk.internal.misc

 *          java.compiler

 *          java.management

 *          jdk.jvmstat/sun.jvmstat.monitor

 * @build jdk.test.lib.*

 * @build jdk.test.lib.dcmd.*

 * @run testng ClassHistogramTest

 */

public class ClassHistogramTest {

    public static class TestClass {}

    public static TestClass[] instances = new TestClass[1024];

    protected String classHistogramArgs = "";

    static {

        for (int i = 0; i < instances.length; ++i) {

            instances[i] = new TestClass();

        }

    }

    public void run(CommandExecutor executor) {

        OutputAnalyzer output = executor.execute("GC.class_histogram " + classHistogramArgs);

        /*

         * example output:

         * ...

         */

        /* Require at least one java.lang.Class */

        /* Require at least one java.lang.String */

        /* Require at least one java.lang.Object */

        /* Require at exactly one TestClass[] */

        output.shouldMatch("^\\s+\\d+:\\s+1\\s+\\d+\\s+" +

        /* Require at exactly 1024 TestClass */

        output.shouldMatch("^\\s+\\d+:\\s+1024\\s+\\d+\\s+" +

    }

    @Test

    public void jmx() {

        run(new JMXExecutor());

    }

}