src/test/java/com/android/tools/r8/mappingcompose/ComposeDuplicateClassMappingTest.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 static org.junit.Assert.assertThrows;

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.MappingComposeException;
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 ComposeDuplicateClassMappingTest extends TestBase {

  @Parameter() public TestParameters parameters;

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

  private static final String mappingFoo =
      StringUtils.unixLines(
          "# {'id':'com.android.tools.r8.mapping','version':'experimental'}", "com.foo -> b:");
  private static final String mappingBar =
      StringUtils.unixLines(
          "# {'id':'com.android.tools.r8.mapping','version':'experimental'}", "a -> b:");

  @Test
  public void testCompose() throws Exception {
    ClassNameMapper mappingForFoo = ClassNameMapper.mapperFromString(mappingFoo);
    ClassNameMapper mappingForBar = ClassNameMapper.mapperFromString(mappingBar);
    MappingComposeException mappingComposeException =
        assertThrows(
            MappingComposeException.class,
            () -> MappingComposer.compose(mappingForFoo, mappingForBar));
    assertEquals(
        "Duplicate class mapping. Both 'com.foo' and 'a' maps to 'b'.",
        mappingComposeException.getMessage());
  }
}