test/langtools/jdk/jshell/ToolEnablePreviewTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8199193
 * @summary Tests for the --enable-preview option
 * @run testng ToolEnablePreviewTest
 */

import java.io.IOException;
import java.io.Writer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.testng.annotations.Test;

import static org.testng.Assert.assertTrue;

public class ToolEnablePreviewTest extends ReplToolTesting {

    @Test
    public void testOptionDebug() {
        String release = System.getProperty("java.specification.version");
        test(
                (a) -> assertCommand(a, "/debug b",
                        "RemoteVM Options: []\n"
                        + "Compiler options: []"),
                (a) -> assertCommand(a, "/env --enable-preview",
                        "|  Setting new options and restoring state."),
                (a) -> assertCommandCheckOutput(a, "/debug b", s -> {
                    assertTrue(s.contains("RemoteVM Options: [--enable-preview]"));
                    assertTrue(s.contains("Compiler options: [-source, " + release + ", --enable-preview]")
                            || s.contains("Compiler options: [--enable-preview, -source, " + release + "]"),
                            "\nExpected -- " + "Compiler options: [-source, " + release + ", --enable-preview]"
                            + "\nOr -- " + "Compiler options: [--enable-preview, -source, " + release + "]"
                            + "\nBut got -- " + s);
                })
        );
    }

    @Test
    public void testCommandLineFlag() {
        String release = System.getProperty("java.specification.version");
        test(new String[] {"--enable-preview"},
                (a) -> assertCommandCheckOutput(a, "/debug b", s -> {
                    assertTrue(s.contains("RemoteVM Options: [--enable-preview]"));
                    assertTrue(s.contains("Compiler options: [-source, " + release + ", --enable-preview]")
                            || s.contains("Compiler options: [--enable-preview, -source, " + release + "]"),
                            "\nExpected -- " + "Compiler options: [-source, " + release + ", --enable-preview]"
                            + "\nOr -- " + "Compiler options: [--enable-preview, -source, " + release + "]"
                            + "\nBut got -- " + s);
                })
        );
    }

    @Test
    public void testCompilerTestFlagEnv() throws IOException {
        Path startupFile = Paths.get("startup.repl");
        try (Writer w = Files.newBufferedWriter(startupFile)) {
            w.write("""
                    import java.util.function.*;
                    """);
        }
        test(new String[] {"-C", "-XDforcePreview", "-startup", startupFile.toString()},
                (a) -> assertCommandOutputContains(a, "Function<Integer,Integer> f = (var i) -> i + i",
                        "Error", "preview feature"),
                (a) -> assertCommand(a, "/env --enable-preview",
                        "|  Setting new options and restoring state."),
                (a) -> assertCommandOutputContains(a, "Function<Integer,Integer> f = (var i) -> i + i",
                        "f ==> ")
        );
    }

    @Test
    public void testCompilerTestFlag() {
        test(new String[] {"-C", "-XDforcePreview", "--enable-preview"},
                (a) -> assertCommandOutputContains(a, "Function<Integer,Integer> f = (var i) -> i + i",
                        "f ==> "),
                (a) -> assertCommandOutputContains(a, "f.apply(2)", "==> 4")
        );
    }

}