litho-testing/src/main/java/com/facebook/litho/testing/Whitebox.java [46:73]:
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  private static Field findFieldInHierarchy(Class<?> startClass, String fieldName) {
    Field foundField = null;
    Class<?> currentClass = startClass;
    while (currentClass != null) {
      final Field[] declaredFields = currentClass.getDeclaredFields();

      for (Field field : declaredFields) {
        if (field.getName().equals(fieldName)) {
          if (foundField != null) {
            throw new IllegalArgumentException(
                "Two or more fields matching " + fieldName + " in " + startClass + ".");
          }

          foundField = field;
        }
      }
      if (foundField != null) {
        break;
      }
      currentClass = currentClass.getSuperclass();
    }
    if (foundField == null) {
      throw new IllegalArgumentException(
          "No fields matching " + fieldName + " in " + startClass + ".");
    }
    foundField.setAccessible(true);
    return foundField;
  }
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litho-core/src/main/java/com/facebook/litho/TestLayoutState.java [463:490]:
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  private static Field findFieldInHierarchy(Class<?> startClass, String fieldName) {
    Field foundField = null;
    Class<?> currentClass = startClass;
    while (currentClass != null) {
      final Field[] declaredFields = currentClass.getDeclaredFields();

      for (Field field : declaredFields) {
        if (field.getName().equals(fieldName)) {
          if (foundField != null) {
            throw new IllegalArgumentException(
                "Two or more fields matching " + fieldName + " in " + startClass + ".");
          }

          foundField = field;
        }
      }
      if (foundField != null) {
        break;
      }
      currentClass = currentClass.getSuperclass();
    }
    if (foundField == null) {
      throw new IllegalArgumentException(
          "No fields matching " + fieldName + " in " + startClass + ".");
    }
    foundField.setAccessible(true);
    return foundField;
  }
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