src/test/java/com/android/tools/r8/shaking/desugar/KeepRuleWarningTest.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.shaking.desugar;

import static org.hamcrest.CoreMatchers.containsString;

import com.android.tools.r8.NoVerticalClassMerging;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestDiagnosticMessages;
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.StringUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

@NoVerticalClassMerging
interface I {
  static void foo() {
    System.out.println("static::foo");
  }

  default void bar() {
    foo();
    System.out.println("default::bar");
  }
}

class C implements I {
}

class KeepRuleWarningTestRunner {
  public static void main(String[] args) {
    C obj = new C();
    obj.bar();
  }
}

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

  private static final Class<?> MAIN = KeepRuleWarningTestRunner.class;
  private static final String EXPECTED_OUTPUT = StringUtils.lines("static::foo", "default::bar");

  private final TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withDexRuntimes().withApiLevel(AndroidApiLevel.L).build();
  }

  public KeepRuleWarningTest(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Test
  public void test_allMethods() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramClasses(I.class, C.class, MAIN)
        .setMinApi(parameters.getApiLevel())
        .enableNoVerticalClassMergingAnnotations()
        .addKeepMainRule(MAIN)
        .addKeepRules("-keep interface **.I { <methods>; }")
        .compile()
        .inspectDiagnosticMessages(TestDiagnosticMessages::assertNoMessages)
        .run(parameters.getRuntime(), MAIN)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

  @Test
  public void test_asterisk() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramClasses(I.class, C.class, MAIN)
        .setMinApi(parameters.getApiLevel())
        .enableNoVerticalClassMergingAnnotations()
        .addKeepMainRule(MAIN)
        .addKeepRules("-keep interface **.I { *(); }")
        .compile()
        .inspectDiagnosticMessages(TestDiagnosticMessages::assertNoMessages)
        .run(parameters.getRuntime(), MAIN)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

  @Test
  public void test_stillNotSpecific() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramClasses(I.class, C.class, MAIN)
        .setMinApi(parameters.getApiLevel())
        .enableNoVerticalClassMergingAnnotations()
        .addKeepMainRule(MAIN)
        .addKeepRules("-keep interface **.I { *** f*(); }")
        .compile()
        .inspectDiagnosticMessages(TestDiagnosticMessages::assertNoMessages)
        .run(parameters.getRuntime(), MAIN)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

  @Test
  public void test_specific() throws Exception {
    testForR8(parameters.getBackend())
        .addProgramClasses(I.class, C.class, MAIN)
        .setMinApi(parameters.getApiLevel())
        .enableNoVerticalClassMergingAnnotations()
        .addKeepMainRule(MAIN)
        .addKeepRules("-keep interface **.I { static void foo(); }")
        .allowDiagnosticWarningMessages()
        .compile()
        .inspectDiagnosticMessages(
            m ->
                m.assertWarningsCount(1)
                    .assertWarningMessageThatMatches(containsString("static void foo()"))
                    .assertWarningMessageThatMatches(containsString("is ignored"))
                    .assertWarningMessageThatMatches(containsString("will be desugared")))
        .run(parameters.getRuntime(), MAIN)
        .assertSuccessWithOutput(EXPECTED_OUTPUT);
  }

}