src/test/java/com/android/tools/r8/mappingcompose/ComposeDifferentMethodTest.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.mappingcompose;

import static org.junit.Assert.assertEquals;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.naming.ClassNameMapper;
import com.android.tools.r8.naming.MappingComposer;
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.Parameter;
import org.junit.runners.Parameterized.Parameters;

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

  @Parameter() public TestParameters parameters;

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

  // Here we are testing that a shrinker could have changed the method signature. Since we have no
  // right hand side mapping we have no other choice than to map the naming through. This would not
  // be ok if we had overloads but any shrinker should put in line numbering for those.
  private static final String mappingFoo =
      StringUtils.unixLines("com.foo -> a:", "    void f1(int) -> f2");
  private static final String mappingBar =
      StringUtils.unixLines("a -> b:", "    int f2(boolean) -> f3");
  private static final String mappingResult =
      StringUtils.unixLines("com.foo -> b:", "    void f1(int) -> f3");

  @Test
  public void testCompose() throws Exception {
    ClassNameMapper mappingForFoo = ClassNameMapper.mapperFromString(mappingFoo);
    ClassNameMapper mappingForBar = ClassNameMapper.mapperFromString(mappingBar);
    String composed = MappingComposer.compose(mappingForFoo, mappingForBar);
    assertEquals(mappingResult, composed);
  }
}