litho-testing/src/main/java/com/facebook/litho/testing/Whitebox.java [26:34]:
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  public static <T> T getInternalState(Object object, String fieldName) {
    Field foundField = findFieldInHierarchy(getType(object), fieldName);
    try {
      return (T) foundField.get(object);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(
          "Internal error: Failed to get field in method getInternalState.", e);
    }
  }
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litho-core/src/main/java/com/facebook/litho/TestLayoutState.java [453:461]:
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  private static <T> T getInternalState(Object object, String fieldName) {
    Field foundField = findFieldInHierarchy(getType(object), fieldName);
    try {
      return (T) foundField.get(object);
    } catch (IllegalAccessException e) {
      throw new RuntimeException(
          "Internal error: Failed to get field in method getInternalState.", e);
    }
  }
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