src/test/java/com/android/tools/r8/desugar/desugaredlibrary/conversiontests/DuplicateAPIDesugaredLibTest.java

// Copyright (c) 2019, 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.desugaredlibrary.conversiontests;

import static junit.framework.TestCase.assertEquals;

import com.android.tools.r8.TestRuntime.DexRuntime;
import com.android.tools.r8.ToolHelper.DexVm;
import com.android.tools.r8.desugar.desugaredlibrary.DesugaredLibraryTestBase;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.Box;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import java.nio.file.Path;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiConsumer;
import org.junit.Test;

public class DuplicateAPIDesugaredLibTest extends DesugaredLibraryTestBase {

  @Test
  public void testLib() throws Exception {
    Box<Path> desugaredLibBox = new Box<>();
    Path customLib =
        testForD8()
            .addProgramClasses(CustomLibClass.class)
            .setMinApi(AndroidApiLevel.B)
            .compile()
            .writeToZip();
    String stdOut =
        testForD8()
            .setMinApi(AndroidApiLevel.B)
            .addProgramClasses(Executor.class)
            .addLibraryClasses(CustomLibClass.class)
            .enableCoreLibraryDesugaring(AndroidApiLevel.B)
            .compile()
            .addDesugaredCoreLibraryRunClassPath(
                (AndroidApiLevel api) -> {
                  desugaredLibBox.set(this.buildDesugaredLibrary(api));
                  return desugaredLibBox.get();
                },
                AndroidApiLevel.B)
            .addRunClasspathFiles(customLib)
            .run(new DexRuntime(DexVm.ART_9_0_0_HOST), Executor.class)
            .assertSuccess()
            .getStdOut();
    assertDupMethod(new CodeInspector(desugaredLibBox.get()));
    assertLines2By2Correct(stdOut);
  }

  private void assertDupMethod(CodeInspector inspector) {
    ClassSubject clazz = inspector.clazz("j$.util.concurrent.ConcurrentHashMap");
    assertEquals(
        2,
        clazz.virtualMethods().stream().filter(m -> m.getOriginalName().equals("forEach")).count());
  }

  static class Executor {

    public static void main(String[] args) {
      Map<Integer, Double> map = new ConcurrentHashMap<>();
      map.put(1, 1.1);
      map.put(2, 2.2);
      BiConsumer<Integer, Double> biConsumer = (x, y) -> System.out.print(" " + x + " " + y);
      map.forEach(biConsumer);
      System.out.println();
      CustomLibClass.javaForEach(map, biConsumer);
    }
  }

  // This class will be put at compilation time as library and on the runtime class path.
  // This class is convenient for easy testing. Each method plays the role of methods in the
  // platform APIs for which argument/return values need conversion.
  static class CustomLibClass {

    @SuppressWarnings("WeakerAccess")
    public static <K, V> void javaForEach(Map<K, V> map, BiConsumer<K, V> consumer) {
      map.forEach(consumer);
    }
  }
}