shadowapi/src/main/java/org/robolectric/util/ReflectionHelpers.java
public static void setStaticField(Field field, Object fieldNewValue) {
    try {
      makeFieldVeryAccessible(field);
      field.set(null, fieldNewValue);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
public static void setStaticField(Field field, Object fieldNewValue) {
    try {
      makeFieldVeryAccessible(field);
      field.set(null, fieldNewValue);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
Reflectively set the value of a static field.

@param field Field object.
@param fieldNewValue The new value.