jdk-24/test/hotspot/jtreg/runtime/logging/StartupTimeTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8148630
 * @summary -Xlog:startuptime should produce logging from the source code
 * @requires vm.flagless
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver StartupTimeTest
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class StartupTimeTest {
    static void analyzeOutputOn(ProcessBuilder pb) throws Exception {
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldMatch("(Genesis, [0-9]+.[0-9]+ secs)");
        output.shouldMatch("(Start VMThread, [0-9]+.[0-9]+ secs)");
        output.shouldMatch("(Initialize module system, [0-9]+.[0-9]+ secs)");
        output.shouldMatch("(Create VM, [0-9]+.[0-9]+ secs)");
        output.shouldHaveExitValue(0);
    }

    static void analyzeOutputOff(ProcessBuilder pb) throws Exception {
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldNotContain("[startuptime]");
        output.shouldHaveExitValue(0);
    }

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:startuptime",
                                                                             InnerClass.class.getName());
        analyzeOutputOn(pb);

        pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:startuptime=off",
                                                              InnerClass.class.getName());
        analyzeOutputOff(pb);
    }

    public static class InnerClass {
        public static void main(String[] args) throws Exception {
            System.out.println("Testing startuptime.");
        }
    }
}