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

// Copyright (c) 2022, 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 com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification.DEFAULT_SPECIFICATIONS;
import static com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification.JDK11_PATH;
import static com.android.tools.r8.utils.codeinspector.CodeMatchers.invokesMethod;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresentAndRenamed;
import static org.hamcrest.MatcherAssert.assertThat;

import com.android.tools.r8.TestParameters;
import com.android.tools.r8.desugar.desugaredlibrary.DesugaredLibraryTestBase;
import com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification;
import com.android.tools.r8.desugar.desugaredlibrary.test.CustomLibrarySpecification;
import com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification;
import com.android.tools.r8.synthesis.SyntheticItemsTestUtils;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import java.nio.file.attribute.FileTime;
import java.util.List;
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 FileTimeConversionTest extends DesugaredLibraryTestBase {

  private final TestParameters parameters;
  private final LibraryDesugaringSpecification libraryDesugaringSpecification;
  private final CompilationSpecification compilationSpecification;

  private static final AndroidApiLevel MIN_SUPPORTED = AndroidApiLevel.O;
  private static final String EXPECTED_RESULT = StringUtils.lines("1970-01-01T00:00:01.234Z");

  @Parameters(name = "{0}, spec: {1}, {2}")
  public static List<Object[]> data() {
    return buildParameters(
        getConversionParametersUpToExcluding(MIN_SUPPORTED),
        ImmutableList.of(JDK11_PATH),
        DEFAULT_SPECIFICATIONS);
  }

  public FileTimeConversionTest(
      TestParameters parameters,
      LibraryDesugaringSpecification libraryDesugaringSpecification,
      CompilationSpecification compilationSpecification) {
    this.parameters = parameters;
    this.libraryDesugaringSpecification = libraryDesugaringSpecification;
    this.compilationSpecification = compilationSpecification;
  }

  @Test
  public void test() throws Throwable {
    testForDesugaredLibrary(parameters, libraryDesugaringSpecification, compilationSpecification)
        .addProgramClasses(Executor.class)
        .setCustomLibrarySpecification(
            new CustomLibrarySpecification(CustomLibClass.class, MIN_SUPPORTED))
        .addKeepMainRule(Executor.class)
        .collectSyntheticItems()
        .compile()
        .apply(
            cr ->
                cr.inspect(inspector -> assertCallsToConversion(inspector, cr.getSyntheticItems())))
        .run(parameters.getRuntime(), Executor.class)
        .assertSuccessWithOutput(EXPECTED_RESULT);
  }

  private void assertCallsToConversion(
      CodeInspector inspector, SyntheticItemsTestUtils syntheticItems) {
    ClassSubject apiConversionClass =
        inspector.clazz(syntheticItems.syntheticApiConversionClass(Executor.class, 0));
    assertThat(apiConversionClass, isPresent());
    if (compilationSpecification.isProgramShrink() || compilationSpecification.isR8Partial()) {
      assertThat(apiConversionClass, isPresentAndRenamed());
    }

    MethodSubject apiConversionMethod = apiConversionClass.uniqueMethodWithOriginalName("m");
    assertThat(apiConversionMethod, isPresent());
    assertThat(inspector.clazz(Executor.class).mainMethod(), invokesMethod(apiConversionMethod));
  }

  static class Executor {

    public static void main(String[] args) {
      System.out.println(CustomLibClass.get(FileTime.fromMillis(1234L)));
    }
  }

  // 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 {

    public static FileTime get(FileTime fileTime) {
      return fileTime;
    }
  }
}