src/test/java/com/android/tools/r8/apimodel/ApiModelNoOutlineForFullyMockedTest.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.apimodel;

import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForClass;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForDefaultInstanceInitializer;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForMethod;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.verifyThat;
import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assume.assumeFalse;

import com.android.tools.r8.NeverInline;
import com.android.tools.r8.NoReturnTypeStrengthening;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.ToolHelper.DexVm.Version;
import com.android.tools.r8.testing.AndroidBuildVersion;
import com.android.tools.r8.utils.AndroidApiLevel;
import java.lang.reflect.Method;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

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

  private final AndroidApiLevel libraryApiLevel = AndroidApiLevel.M;

  @Parameter public TestParameters parameters;

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

  @Test
  public void testR8() throws Exception {
    // TODO(b/197078995): Make this work on 12+.
    assumeFalse(
        parameters.isDexRuntime()
            && parameters.getDexRuntimeVersion().isNewerThanOrEqual(Version.V12_0_0));
    boolean isLibraryApiLevel =
        parameters.isDexRuntime()
            && parameters.getApiLevel().isGreaterThanOrEqualTo(libraryApiLevel);
    Method methodOn23 = LibraryClass.class.getDeclaredMethod("methodOn23");
    Method mainMethod = Main.class.getDeclaredMethod("main", String[].class);
    testForR8(parameters.getBackend())
        .addProgramClasses(Main.class)
        .addLibraryClasses(LibraryClass.class)
        .addDefaultRuntimeLibrary(parameters)
        .setMinApi(parameters.getApiLevel())
        .addKeepMainRule(Main.class)
        .addAndroidBuildVersion()
        .apply(setMockApiLevelForClass(LibraryClass.class, libraryApiLevel))
        .apply(setMockApiLevelForDefaultInstanceInitializer(LibraryClass.class, libraryApiLevel))
        .apply(setMockApiLevelForMethod(methodOn23, libraryApiLevel))
        .apply(ApiModelingTestHelper::enableOutliningOfMethods)
        .apply(ApiModelingTestHelper::enableStubbingOfClasses)
        .enableInliningAnnotations()
        .enableNoReturnTypeStrengtheningAnnotations()
        .compile()
        .applyIf(
            parameters.isDexRuntime()
                && parameters
                    .getRuntime()
                    .maxSupportedApiLevel()
                    .isGreaterThanOrEqualTo(libraryApiLevel),
            b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLinesIf(!isLibraryApiLevel, "Hello World")
        .assertSuccessWithOutputLinesIf(
            isLibraryApiLevel, "LibraryClass::methodOn23", "Hello World")
        .inspect(
            inspector -> {
              assertThat(inspector.method(mainMethod), isPresent());
              // TODO(b/211720912): We should never outline since the library class and method is
              //  introduced at the same level.
              verifyThat(inspector, parameters, methodOn23).isNotOutlinedFrom(mainMethod);
              verifyThat(inspector, parameters, LibraryClass.class).stubbedUntil(libraryApiLevel);
            });
  }

  // Only present from api level 23.
  public static class LibraryClass {

    public void methodOn23() {
      System.out.println("LibraryClass::methodOn23");
    }
  }

  public static class Main {

    @NeverInline
    // TODO(b/214329925): Type strengthening should consult API database.
    @NoReturnTypeStrengthening
    public static Object create() {
      return AndroidBuildVersion.VERSION >= 23 ? new LibraryClass() : null;
    }

    public static void main(String[] args) {
      Object libraryClass = create();
      if (libraryClass != null) {
        ((LibraryClass) libraryClass).methodOn23();
      }
      System.out.println("Hello World");
    }
  }
}