src/test/java/com/android/tools/r8/desugar/LambdaMissingInterfaceTest.java

// Copyright (c) 2021, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.desugar;

import static com.android.tools.r8.DiagnosticsMatcher.diagnosticMessage;
import static com.android.tools.r8.DiagnosticsMatcher.diagnosticType;
import static org.hamcrest.CoreMatchers.allOf;
import static org.hamcrest.CoreMatchers.containsString;

import com.android.tools.r8.NeverInline;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.utils.UnverifiableCfCodeDiagnostic;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class LambdaMissingInterfaceTest extends TestBase {

  private final TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withDexRuntimes().withAllApiLevels().build();
  }

  public LambdaMissingInterfaceTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramClasses(ClassWithLambda.class, Main.class)
        .addKeepMainRule(Main.class)
        .setMinApi(parameters.getApiLevel())
        .addDontWarn(MissingInterface.class)
        .allowDiagnosticWarningMessages()
        .enableInliningAnnotations()
        .compileWithExpectedDiagnostics(
            diagnostics ->
                diagnostics.assertWarningsMatch(
                    allOf(
                        diagnosticType(UnverifiableCfCodeDiagnostic.class),
                        diagnosticMessage(
                            containsString(
                                "Unverifiable code in `void "
                                    + ClassWithLambda.class.getTypeName()
                                    + ".callWithLambda()`")))))
        .addRunClasspathClasses(MissingInterface.class)
        .run(parameters.getRuntime(), Main.class)
        // We allow for renaming if the class is missing
        .assertFailureWithErrorThatMatchesIf(
            parameters.getDexRuntimeVersion().isDalvik(),
            containsString(descriptor(MissingInterface.class) + "' is not accessible"))
        .assertFailureWithErrorThatThrowsIf(
            !parameters.getDexRuntimeVersion().isDalvik(), IllegalAccessError.class);
  }

  interface MissingInterface {

    void bar(int x);
  }

  public static class ClassWithLambda {

    @NeverInline
    public static void callWithLambda() {
      Main.foo(System.out::println);
    }
  }

  public static class Main {

    private static int argCount;

    @NeverInline
    public static void foo(MissingInterface i) {
      i.bar(argCount);
    }

    public static void main(String[] args) {
      argCount = args.length;
      ClassWithLambda.callWithLambda();
    }
  }
}