src/test/java/com/android/tools/r8/shaking/convertchecknotnull/ConvertCheckNotNullWithAssumeNoSideEffectsTest.java

// Copyright (c) 2025, 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.shaking.convertchecknotnull;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import java.util.Objects;
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 ConvertCheckNotNullWithAssumeNoSideEffectsTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

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

  @Test
  public void test() throws Exception {
    assumeTrue(canUseJavaUtilObjectsRequireNonNull());
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(Main.class)
        .addKeepRules(
            "-assumenosideeffects class java.util.Objects {",
            "  ** requireNonNull(...);",
            "}",
            "-convertchecknotnull class java.util.Objects {",
            "  ** requireNonNull(...);",
            "}")
        .enableExperimentalConvertCheckNotNull()
        .setMinApi(parameters)
        .compile()
        .inspect(
            inspector -> {
              ClassSubject mainClassSubject = inspector.clazz(Main.class);
              assertThat(mainClassSubject, isPresent());

              MethodSubject mainMethodSubject = mainClassSubject.mainMethod();
              assertThat(mainMethodSubject, isPresent());
              assertTrue(mainMethodSubject.getMethod().getCode().asDexCode().isEmptyVoidMethod());
            });
  }

  private boolean canUseJavaUtilObjectsRequireNonNull() {
    return parameters.getApiLevel().isGreaterThanOrEqualTo(AndroidApiLevel.K);
  }

  static class Main {

    public static void main(String[] args) {
      Objects.requireNonNull(args);
    }
  }
}