### Question:
PrimitiveLongWrapper extends LongWrapper { @Override public Long getDefault() { return defaultValue; } PrimitiveLongWrapper();  PrimitiveLongWrapper(long value); @Override void set(Number v); @Override Long getDefault(); @Override boolean isPrimitiveWrapper(); @Override R accept(WrapperVisitor<R, P, Q, TH> visitor, P p, Q q);  }### Answer:
@Test void getDefault() { PrimitiveLongWrapper wrapper = new PrimitiveLongWrapper(); assertEquals(0L, wrapper.getDefault()); }