src/test/java/com/android/tools/r8/kotlin/metadata/MetadataRewriteRemovedCompanionTest.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.kotlin.metadata;

import static com.android.tools.r8.KotlinCompilerTool.KotlinCompilerVersion.MIN_SUPPORTED_VERSION;

import com.android.tools.r8.KotlinTestParameters;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.utils.StringUtils;
import java.nio.file.Path;
import java.util.Collection;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class MetadataRewriteRemovedCompanionTest extends KotlinMetadataTestBase {
  private static final String EXPECTED = StringUtils.lines("Hello World!");

  private final TestParameters parameters;

  @Parameterized.Parameters(name = "{0}, {1}")
  public static Collection<Object[]> data() {
    return buildParameters(
        getTestParameters().withCfRuntimes().build(),
        getKotlinTestParameters()
            .withCompilersStartingFromIncluding(MIN_SUPPORTED_VERSION)
            .withAllTargetVersions()
            .build());
  }

  public MetadataRewriteRemovedCompanionTest(
      TestParameters parameters, KotlinTestParameters kotlinParameters) {
    super(kotlinParameters);
    this.parameters = parameters;
  }

  private static final KotlinCompileMemoizer companionRemoveJarMap =
      getCompileMemoizer(getKotlinFileInTest(PKG_PREFIX + "/companion_remove_lib", "lib"));

  @Test
  public void smokeTest() throws Exception {
    Path libJar = companionRemoveJarMap.getForConfiguration(kotlinc, targetVersion);

    Path output =
        kotlinc(parameters.getRuntime().asCf(), kotlinc, targetVersion)
            .addClasspathFiles(libJar)
            .addSourceFiles(getKotlinFileInTest(PKG_PREFIX + "/companion_remove_app", "main"))
            .setOutputPath(temp.newFolder().toPath())
            .compile();

    testForJvm()
        .addRunClasspathFiles(kotlinc.getKotlinStdlibJar(), libJar)
        .addClasspath(output)
        .run(parameters.getRuntime(), PKG + ".companion_remove_app.MainKt")
        .assertSuccessWithOutput(EXPECTED);
  }

  @Test
  public void testMetadataInCompanion_kept() throws Exception {
    Path libJar =
        testForR8(parameters.getBackend())
            .addClasspathFiles(kotlinc.getKotlinStdlibJar(), kotlinc.getKotlinAnnotationJar())
            .addProgramFiles(companionRemoveJarMap.getForConfiguration(kotlinc, targetVersion))
            // Keep everything
            .addKeepRules("-keep class **.companion_remove_lib.** { *; }")
            .addKeepKotlinMetadata()
            // To keep ...$Companion structure
            .addKeepAttributeInnerClassesAndEnclosingMethod()
            .compile()
            .writeToZip();

    Path output =
        kotlinc(parameters.getRuntime().asCf(), kotlinc, targetVersion)
            .addClasspathFiles(libJar)
            .addSourceFiles(getKotlinFileInTest(PKG_PREFIX + "/companion_remove_app", "main"))
            .setOutputPath(temp.newFolder().toPath())
            .compile();

    testForJvm()
        .addRunClasspathFiles(kotlinc.getKotlinStdlibJar(), libJar)
        .addClasspath(output)
        .run(parameters.getRuntime(), PKG + ".companion_remove_app.MainKt")
        .assertSuccessWithOutput(EXPECTED);
  }

  @Test
  public void testMetadataInCompanion_removedField() throws Exception {
    Path libJar =
        testForR8(parameters.getBackend())
            .addClasspathFiles(kotlinc.getKotlinStdlibJar(), kotlinc.getKotlinAnnotationJar())
            .addProgramFiles(companionRemoveJarMap.getForConfiguration(kotlinc, targetVersion))
            // Keep the ClasWithCompanion class.
            .addKeepKotlinMetadata()
            .addKeepRules("-keep class **.ClassWithCompanion { void <init>(); void doStuff(); }")
            .addKeepRules("-keep class **.ClassWithCompanion$Companion")
            .compile()
            .writeToZip();

    Path output =
        kotlinc(parameters.getRuntime().asCf(), kotlinc, targetVersion)
            .addClasspathFiles(libJar)
            .addSourceFiles(getKotlinFileInTest(PKG_PREFIX + "/companion_remove_app", "main"))
            .setOutputPath(temp.newFolder().toPath())
            .compile();

    testForJvm()
        .addRunClasspathFiles(kotlinc.getKotlinStdlibJar(), libJar)
        .addClasspath(output)
        .run(parameters.getRuntime(), PKG + ".companion_remove_app.MainKt")
        .assertSuccessWithOutput(EXPECTED);
  }
}