jdk/test/langtools/tools/javac/patterns/InstanceOfModelTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8348906
 * @summary Verify the InstanceOfTree model
 */

import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.InstanceOfTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreeScanner;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.ToolProvider;

public class InstanceOfModelTest {
    private final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

    public static void main(String... args) throws Exception {
        new InstanceOfModelTest().run();
    }

    private void run() throws Exception {
        JavaFileObject input =
                SimpleJavaFileObject.forSource(URI.create("mem://Test.java"),
                                               """
                                               public class Test {
                                                   void test(Object o) {
                                                       boolean _ = o instanceof R;
                                                       boolean _ = o instanceof R r;
                                                       boolean _ = o instanceof R(var v);
                                                   }
                                                   record R(int i) {}
                                               }
                                               """);
        JavacTask task =
                (JavacTask) compiler.getTask(null, null, null, null, null, List.of(input));
        CompilationUnitTree cut = task.parse().iterator().next();

        task.analyze();

        List<String> instanceOf = new ArrayList<>();

        new TreeScanner<Void, Void>() {
            @Override
            public Void visitInstanceOf(InstanceOfTree node, Void p) {
                instanceOf.add(node.getPattern() + ":" + node.getType());
                return super.visitInstanceOf(node, p);
            }
        }.scan(cut, null);

        List<String> expectedInstanceOf = List.of(
            "null:R",
            "R r:R",
            "R(int v):null"
        );

        if (!Objects.equals(expectedInstanceOf, instanceOf)) {
            throw new AssertionError("Expected: " + expectedInstanceOf + ",\n" +
                                     "got: " + instanceOf);
        }
    }
}