robolectric/src/main/java/org/robolectric/ConfigMerger.java
protected Properties getConfigProperties(String packageName) {
    List<String> packageParts = new ArrayList<>(Arrays.asList(packageName.split("\\.")));
    packageParts.add(RobolectricTestRunner.CONFIG_PROPERTIES);
    final String resourceName = Join.join("/", packageParts);
    try (InputStream resourceAsStream = getResourceAsStream(resourceName)) {
      if (resourceAsStream == null) return null;
      Properties properties = new Properties();
      properties.load(resourceAsStream);
      return properties;
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
protected Properties getConfigProperties(String packageName) {
    List<String> packageParts = new ArrayList<>(Arrays.asList(packageName.split("\\.")));
    packageParts.add(RobolectricTestRunner.CONFIG_PROPERTIES);
    final String resourceName = Join.join("/", packageParts);
    try (InputStream resourceAsStream = getResourceAsStream(resourceName)) {
      if (resourceAsStream == null) return null;
      Properties properties = new Properties();
      properties.load(resourceAsStream);
      return properties;
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
Return a {@link Properties} file for the given package name, or {@code null} if none is available.

@since 3.2