test/langtools/tools/javac/ImplicitClass/ErrorRecovery.java

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/**
 * @test
 * @bug 8338301 8344706
 * @summary Verify error recovery and reporting related to implicitly declared classes
 * @library /tools/lib
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 *          jdk.compiler/com.sun.tools.javac.util
 * @build toolbox.ToolBox toolbox.JavacTask
 * @run main ErrorRecovery
*/

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.Objects;

import toolbox.TestRunner;
import toolbox.JavacTask;
import toolbox.JavaTask;
import toolbox.Task;
import toolbox.Task.OutputKind;
import toolbox.ToolBox;

public class ErrorRecovery extends TestRunner {

    private static final String SOURCE_VERSION = System.getProperty("java.specification.version");
    private ToolBox tb;

    public static void main(String... args) throws Exception {
        new ErrorRecovery().runTests();
    }

    ErrorRecovery() {
        super(System.err);
        tb = new ToolBox();
    }

    public void runTests() throws Exception {
        runTests(m -> new Object[] { Paths.get(m.getName()) });
    }

    @Test
    public void testMethodNoReturnType(Path base) throws Exception {
        Path current = base.resolve(".");
        Path src = current.resolve("src");
        Path classes = current.resolve("classes");
        tb.writeFile(src.resolve("Test.java"),
                     """
                     main() {}
                     """);

        Files.createDirectories(classes);

        List<String> log = new JavacTask(tb)
            .options("-XDrawDiagnostics")
            .outdir(classes)
            .files(tb.findJavaFiles(src))
            .run(Task.Expect.FAIL)
            .writeAll()
            .getOutputLines(OutputKind.DIRECT);
        List<String> expected = List.of(
            "Test.java:1:1: compiler.err.invalid.meth.decl.ret.type.req",
            "1 error"
        );
        if (!Objects.equals(expected, log)) {
            throw new AssertionError("Unexpected output: " + log +
                                     ", while expecting: " + expected);
        }
    }

    @Test
    public void testStatement(Path base) throws Exception {
        Path current = base.resolve(".");
        Path src = current.resolve("src");
        Path classes = current.resolve("classes");
        tb.writeFile(src.resolve("Test.java"),
                     """
                     if (true) {int var = 0;}
                     """);

        Files.createDirectories(classes);

        List<String> log = new JavacTask(tb)
            .options("-XDrawDiagnostics",
                     "-XDshould-stop.at=FLOW")
            .outdir(classes)
            .files(tb.findJavaFiles(src))
            .run(Task.Expect.FAIL)
            .writeAll()
            .getOutputLines(OutputKind.DIRECT);
        List<String> expected = List.of(
            "Test.java:1:1: compiler.err.statement.not.expected",
            "1 error"
        );
        if (!Objects.equals(expected, log)) {
            throw new AssertionError("Unexpected output: " + log +
                                     ", while expecting: " + expected);
        }
    }

    @Test
    public void testExtraSemi(Path base) throws Exception {
        Path current = base.resolve(".");
        Path src = current.resolve("src");
        Path classes = current.resolve("classes");
        tb.writeFile(src.resolve("Test.java"),
                     """
                     class C {};
                     void main() {};
                     """);

        Files.createDirectories(classes);

        new JavacTask(tb)
            .options("-XDrawDiagnostics")
            .outdir(classes)
            .files(tb.findJavaFiles(src))
            .run(Task.Expect.SUCCESS)
            .writeAll();
    }

    @Test
    public void testVeryBroken(Path base) throws Exception {
        Path current = base.resolve(".");
        Path src = current.resolve("src");
        Path classes = current.resolve("classes");
        tb.writeFile(src.resolve("Test.java"),
                     """
                     "neither-of-class-method-file-statement"
                     """);

        Files.createDirectories(classes);

        List<String> log;
        List<String> expected;

        log = new JavacTask(tb)
                .options("-XDrawDiagnostics")
                .outdir(classes)
                .files(tb.findJavaFiles(src))
                .run(Task.Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);
        expected = List.of(
                "Test.java:1:1: compiler.err.class.method.or.field.expected",
                "1 error"
        );

        if (!Objects.equals(expected, log)) {
            throw new AssertionError("Unexpected output: " + log +
                                     ", while expecting: " + expected);
        }

        log = new JavacTask(tb)
                .options("-XDrawDiagnostics")
                .outdir(classes)
                .files(tb.findJavaFiles(src))
                .run(Task.Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);
        expected = List.of(
                "Test.java:1:1: compiler.err.class.method.or.field.expected",
                "1 error"
        );

        if (!Objects.equals(expected, log)) {
            throw new AssertionError("Unexpected output: " + log +
                                     ", while expecting: " + expected);
        }

        log = new JavacTask(tb)
                .options("-XDrawDiagnostics",
                         "--release", "17")
                .outdir(classes)
                .files(tb.findJavaFiles(src))
                .run(Task.Expect.FAIL)
                .writeAll()
                .getOutputLines(OutputKind.DIRECT);
        expected = List.of(
                "Test.java:1:1: compiler.err.expected4: class, interface, enum, record",
                "1 error"
        );

        if (!Objects.equals(expected, log)) {
            throw new AssertionError("Unexpected output: " + log +
                                     ", while expecting: " + expected);
        }
    }

}