test/jdk/java/lang/ProcessBuilder/InheritIOTest.java

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/*
 * @test
 * @bug 8023130 8166026
 * @summary Unit test for java.lang.ProcessBuilder inheritance of standard output and standard error streams
 * @requires vm.flagless
 * @library /test/lib
 * @build jdk.test.lib.process.*
 * @run testng InheritIOTest
 */

import java.util.List;
import static java.lang.ProcessBuilder.Redirect.INHERIT;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class InheritIOTest {

    private static final String EXIT_VALUE_TEMPLATE = "exit value: %d";
    private static final String EXPECTED_RESULT_STDOUT = "message";
    private static final String EXPECTED_RESULT_STDERR = EXIT_VALUE_TEMPLATE.formatted(0);

    @DataProvider
    public Object[][] testCases() {
        return new Object[][]{
             new Object[] { List.of("InheritIOTest$TestInheritIO", "printf", EXPECTED_RESULT_STDOUT) },
             new Object[] { List.of("InheritIOTest$TestRedirectInherit", "printf", EXPECTED_RESULT_STDOUT) }
        };
    }

    @Test(dataProvider = "testCases")
    public void testInheritWithoutRedirect(List<String> arguments) throws Throwable {
        ProcessBuilder processBuilder = ProcessTools.createLimitedTestJavaProcessBuilder(arguments);
        OutputAnalyzer outputAnalyzer = ProcessTools.executeCommand(processBuilder);
        outputAnalyzer.shouldHaveExitValue(0);
        assertEquals(outputAnalyzer.getStdout(), EXPECTED_RESULT_STDOUT);
        assertEquals(outputAnalyzer.getStderr(), EXPECTED_RESULT_STDERR);
    }

    public static class TestInheritIO {
        public static void main(String args[]) throws Throwable {
            int err = new ProcessBuilder(args).inheritIO().start().waitFor();
            System.err.printf(EXIT_VALUE_TEMPLATE, err);
            System.exit(err);
        }
    }

    public static class TestRedirectInherit {
        public static void main(String args[]) throws Throwable {
            int err = new ProcessBuilder(args)
                    .redirectInput(INHERIT)
                    .redirectOutput(INHERIT)
                    .redirectError(INHERIT)
                    .start().waitFor();
            System.err.printf(EXIT_VALUE_TEMPLATE, err);
            System.exit(err);
        }
    }

}