shadowapi/src/main/java/org/robolectric/util/ReflectionHelpers.java
public static void setField(Class<?> type, final Object object, final String fieldName, final Object fieldNewValue) {
    try {
      Field field = type.getDeclaredField(fieldName);
      field.setAccessible(true);
      field.set(object, fieldNewValue);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
public static void setField(Class<?> type, final Object object, final String fieldName, final Object fieldNewValue) {
    try {
      Field field = type.getDeclaredField(fieldName);
      field.setAccessible(true);
      field.set(object, fieldNewValue);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
Reflectively set the value of a field.

@param type Target type.
@param object Target object.
@param fieldName The field name.
@param fieldNewValue New value.