hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.debug.test/src/org/graalvm/compiler/debug/test/DebugHistogramTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.debug.test;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import org.junit.Assert;
import org.junit.Test;

import org.graalvm.compiler.debug.Debug;
import org.graalvm.compiler.debug.DebugHistogram;
import org.graalvm.compiler.debug.internal.DebugHistogramAsciiPrinter;
import org.graalvm.compiler.debug.internal.DebugHistogramRPrinter;

public class DebugHistogramTest {

    @Test
    public void testEmptyHistogram() {
        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        new DebugHistogramAsciiPrinter(new PrintStream(outputStream)).print(histogram);
        String line = outputStream.toString().split("\r?\n")[0];
        Assert.assertEquals("TestHistogram is empty.", line);

        outputStream.reset();
        new DebugHistogramRPrinter(new PrintStream(outputStream)).print(histogram);
        Assert.assertEquals("", outputStream.toString());
    }

    @Test
    public void testSingleEntryHistogram() {
        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        histogram.add(new Integer(1));
        histogram.add(new Integer(1));
        new DebugHistogramAsciiPrinter(new PrintStream(outputStream)).print(histogram);
        String[] lines = outputStream.toString().split("\r?\n");
        // @formatter:off
        String[] expected = {
            "TestHistogram has 1 unique elements and 2 total elements:",
            "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
            "| 1                                                  | 2          | ==================================================================================================== |",
            "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------"
        };
        // @formatter:on
        Assert.assertArrayEquals(expected, lines);

        outputStream.reset();
        new DebugHistogramRPrinter(new PrintStream(outputStream)).print(histogram);
        lines = outputStream.toString().split("\r?\n");
        // @formatter:off
        expected = new String[] {
            "TestHistogram <- c(2);",
            "names(TestHistogram) <- c(\"1\");"
        };
        // @formatter:on
        Assert.assertArrayEquals(expected, lines);
    }

    @Test
    public void testMultipleEntryHistogram() {
        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        histogram.add(new Integer(1));
        histogram.add(new Integer(2));
        histogram.add(new Integer(2));
        new DebugHistogramAsciiPrinter(new PrintStream(outputStream)).print(histogram);
        String[] lines = outputStream.toString().split("\r?\n");
        // @formatter:off
        String[] expected = new String[] {
            "TestHistogram has 2 unique elements and 3 total elements:",
            "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
            "| 2                                                  | 2          | ==================================================================================================== |",
            "| 1                                                  | 1          | ==================================================                                                   |",
            "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------"
        };
        // @formatter:on
        Assert.assertArrayEquals(expected, lines);

        outputStream.reset();
        new DebugHistogramRPrinter(new PrintStream(outputStream)).print(histogram);
        lines = outputStream.toString().split("\r?\n");
        // @formatter:off
        expected = new String[] {
            "TestHistogram <- c(2, 1);",
            "names(TestHistogram) <- c(\"2\", \"1\");"
        };
        // @formatter:on
        Assert.assertArrayEquals(expected, lines);
    }

    @Test
    public void testTooLongValueString() {
        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        histogram.add("MyCustomValue");
        new DebugHistogramAsciiPrinter(new PrintStream(outputStream), Integer.MAX_VALUE, 10, 10, 1).print(histogram);
        String[] lines = outputStream.toString().split("\r?\n");
        Assert.assertEquals(4, lines.length);
        Assert.assertEquals("TestHistogram has 1 unique elements and 1 total elements:", lines[0]);
        Assert.assertEquals("----------------------------------------", lines[1]);
        Assert.assertEquals("| MyCusto... | 1          | ========== |", lines[2]);
        Assert.assertEquals("----------------------------------------", lines[3]);
    }
}