src/test/testbase/java/com/android/tools/r8/TestDeps.java

// Copyright (c) 2026, 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;

import com.android.tools.r8.utils.AndroidApiLevel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

/**
 * All reading of external files in tests should be managed by this class, which encloses the
 * untyped interface with the Gradle setup and system properties.
 */
public class TestDeps {

  private static Path getTestDependency(String name) {
    String prop = "TEST_DEP_" + name;
    String value = System.getProperty(prop);
    if (value == null) {
      throw new RuntimeException("Required test dependency system property not set: " + prop);
    }
    Path path = Paths.get(value);
    if (!Files.exists(path)) {
      throw new RuntimeException("Required test dependency does not exit: " + prop + "=" + path);
    }
    return path;
  }

  private static final Map<String, Path> dependencies;

  static {
    // This list is serves as a list of required properties to match in Gradle.
    dependencies = new HashMap<>();
    dependencies.put("DEPENDENCIES", null);
    dependencies.put("JDWP_TESTS", null);
  }

  private static Path getDependency(String key) {
    return dependencies.computeIfAbsent(key, TestDeps::getTestDependency);
  }

  public static Path getJunitJar() {
    return getDependencyPath("DEPENDENCIES", "junit", "junit", "4.13.2", "junit-4.13.2.jar");
  }

  public static Path getHamcrestJar() {
    return getDependencyPath(
        "DEPENDENCIES", "org", "hamcrest", "hamcrest-core", "1.3", "hamcrest-core-1.3.jar");
  }

  public static Path getJdwpTestsJar(AndroidApiLevel apiLevel) {
    Path base = getDependency("JDWP_TESTS");
    if (apiLevel.isLessThan(AndroidApiLevel.N)) {
      return base.resolve("apache-harmony-jdwp-tests-host-preN.jar");
    } else {
      return base.resolve("apache-harmony-jdwp-tests-host.jar");
    }
  }

  private static Path getDependencyPath(String dependency, String... path) {
    return resolveMany(getDependency(dependency), path);
  }

  private static Path resolveMany(Path base, String... extensions) {
    Path result = base;
    for (String extension : extensions) {
      result = result.resolve(extension);
    }
    return result;
  }
}