jdk-24/test/jdk/tools/launcher/modules/basic/LauncherErrors.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @bug 8221368
 * @library /test/lib
 * @modules jdk.compiler
 * @build LauncherErrors jdk.test.lib.compiler.CompilerUtils
 * @run testng LauncherErrors
 * @summary Test launcher error message when fails to launch main class
 */


import java.nio.file.Path;
import java.nio.file.Paths;

import jdk.test.lib.compiler.CompilerUtils;
import jdk.test.lib.process.ProcessTools;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class LauncherErrors {
    // test source location
    private static final String TEST_SRC = System.getProperty("test.src");
    private static final Path SRC_DIR = Paths.get(TEST_SRC, "src");

    // module path
    private static final Path MODS_DIR = Paths.get("mods");

    // the module name of the test module
    private static final String TEST_MODULE = "test2";
    // the main class of the test module
    private static final String MAIN_CLASS = "jdk.test2.Main";

    @BeforeTest
    public void compileTestModule() throws Exception {

        // javac -d mods/$TESTMODULE src/$TESTMODULE/**
        boolean compiled =
            CompilerUtils.compile(SRC_DIR.resolve(TEST_MODULE),
                                  MODS_DIR.resolve(TEST_MODULE),
                                  "--add-exports", "java.base/com.sun.crypto.provider=" + TEST_MODULE);

        assertTrue(compiled, "test module did not compile");
    }

    /*
     * Launch java using --module and expect the launched main to succeed.
     */
    @Test
    public void testNoFailure() throws Exception {
        String dir = MODS_DIR.toString();
        String mid = TEST_MODULE + "/" + MAIN_CLASS;

        ProcessTools.executeTestJava("--module-path", dir, "--module", mid)
                    .outputTo(System.out)
                    .errorTo(System.out)
                    .shouldHaveExitValue(0);
    }

    /*
     * Launch java using --module but pass a main class name that doesn't
     * belong to the module being launched. Expect the launch to fail
     * with an expected exception.
     */
    @Test
    public void testErrorMessage() throws Exception {
        String dir = MODS_DIR.toString();
        String wrongMainClass = MAIN_CLASS + "IntentionallyWrong";
        String mid = TEST_MODULE + "/" + wrongMainClass;

        ProcessTools.executeTestJava("--module-path", dir, "--module", mid)
                    .outputTo(System.out)
                    .errorTo(System.out)
                    .shouldContain("Error: Could not find or load main class " + wrongMainClass
                            + " in module " + TEST_MODULE)
                    .shouldNotHaveExitValue(0);

    }

}