src/test/java/com/android/tools/r8/desugar/desugaredlibrary/DisableDesugarTest.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;

import static com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification.DEFAULT_SPECIFICATIONS;
import static com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification.getJdk8Jdk11;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.fail;

import com.android.tools.r8.CompilationFailedException;
import com.android.tools.r8.TestDiagnosticMessages;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.desugar.desugaredlibrary.test.CompilationSpecification;
import com.android.tools.r8.desugar.desugaredlibrary.test.LibraryDesugaringSpecification;
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 DisableDesugarTest extends DesugaredLibraryTestBase {

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

  @Parameters(name = "{0}, spec: {1}, {2}")
  public static List<Object[]> data() {
    return buildParameters(
        getTestParameters().withDexRuntimes().withAllApiLevels().build(),
        getJdk8Jdk11(),
        DEFAULT_SPECIFICATIONS);
  }

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

  @Test
  public void testDisableDesugar() throws Exception {
    try {
      testForDesugaredLibrary(parameters, libraryDesugaringSpecification, compilationSpecification)
          .addInnerClasses(getClass())
          .addKeepMainRule(TestClass.class)
          .disableDesugaring()
          .compileWithExpectedDiagnostics(this::checkExpectedDiagnostics);
    } catch (CompilationFailedException e) {
      // Expected compilation failed.
      return;
    }
    fail("Expected test to fail with CompilationFailedException");
  }

  private void checkExpectedDiagnostics(TestDiagnosticMessages messages) {
    messages.assertInfosCount(0);
    messages.assertWarningsCount(0);
    messages.assertErrorsCount(1);
    assertThat(
        messages.getErrors().get(0).getDiagnosticMessage(),
        containsString("Using desugared library configuration requires desugaring to be enabled"));
  }

  static class TestClass {

    public static void main(String[] args) {
      System.out.println("Hello, world");
    }
  }
}