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Java example source code file (DetectLoggerNameMismatchTest.java)

This example Java source code file (DetectLoggerNameMismatchTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

actual, after, before, bytearrayoutputstream, detected, detectloggernamemismatchtest, given, logger, mismatch_string, printstream, shapebase, square, string, test

The DetectLoggerNameMismatchTest.java Java example source code

/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

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

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * Tests that detecting logger name mismatches works and doesn't cause problems
 * or trigger if disabled.
 * <p>
 * This test can't live inside slf4j-api because the NOP Logger doesn't
 * remember its name.
 *
 * @author Alexander Dorokhine
 * @author Ceki Gülcü
 */
public class DetectLoggerNameMismatchTest {

    private static final String MISMATCH_STRING = "Detected logger name mismatch";

    private final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    private final PrintStream oldErr = System.err;

    @Before
    public void setUp() {
        System.setErr(new PrintStream(byteArrayOutputStream));
    }

    @After
    public void tearDown() {
        setTrialEnabled(false);
        System.setErr(oldErr);
    }

    /*
     * Pass in the wrong class to the Logger with the check disabled, and make sure there are no errors.
     */
    @Test
    public void testNoTriggerWithoutProperty() {
        setTrialEnabled(false);
        Logger logger = LoggerFactory.getLogger(String.class);
        assertEquals("java.lang.String", logger.getName());
        assertMismatchDetected(false);
    }

    /*
     * Pass in the wrong class to the Logger with the check enabled, and make sure there ARE errors.
     */
    @Test
    public void testTriggerWithProperty() {
        setTrialEnabled(true);
        LoggerFactory.getLogger(String.class);
        String s = String.valueOf(byteArrayOutputStream);
        assertMismatchDetected(true);
    }

    /*
     * Checks the whole error message to ensure all the names show up correctly.
     */
    @Test
    public void testTriggerWholeMessage() {
        setTrialEnabled(true);
        LoggerFactory.getLogger(String.class);
        boolean success = String.valueOf(byteArrayOutputStream).contains(
                        "Detected logger name mismatch. Given name: \"java.lang.String\"; " + "computed name: \"org.slf4j.DetectLoggerNameMismatchTest\".");
        assertTrue("Actual value of byteArrayOutputStream: " + String.valueOf(byteArrayOutputStream), success);
    }

    /*
     * Checks that there are no errors with the check enabled if the class matches.
     */
    @Test
    public void testPassIfMatch() {
        setTrialEnabled(true);
        Logger logger = LoggerFactory.getLogger(DetectLoggerNameMismatchTest.class);
        assertEquals("org.slf4j.DetectLoggerNameMismatchTest", logger.getName());
        assertMismatchDetected(false);
    }

    private void assertMismatchDetected(boolean mismatchDetected) {
        assertEquals(mismatchDetected, String.valueOf(byteArrayOutputStream).contains(MISMATCH_STRING));
    }

    @Test
    public void verifyLoggerDefinedInBaseWithOverridenGetClassMethod() {
        setTrialEnabled(true);
        Square square = new Square();
        assertEquals("org.slf4j.Square", square.logger.getName());
        assertMismatchDetected(false);
    }

    private static void setTrialEnabled(boolean enabled) {
        // The system property is read into a static variable at initialization time
        // so we cannot just reset the system property to test this feature.
        // Therefore we set the variable directly.
        LoggerFactory.DETECT_LOGGER_NAME_MISMATCH = enabled;
    }
}

// Used for testing that inheritance is ignored by the checker.
class ShapeBase {
    public Logger logger = LoggerFactory.getLogger(getClass());
}

class Square extends ShapeBase {
}

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