public void testParsingUninitialized() throws Exception { TestRequiredForeign.Builder builder = TestRequiredForeign.newBuilder(); builder.getOptionalMessageBuilder().setDummy2(10); ByteString bytes = builder.buildPartial().toByteString(); Message.Builder abstractMessageBuilder = new AbstractMessageWrapper.Builder(TestRequiredForeign.newBuilder()); // mergeFrom() should not throw initialization error. abstractMessageBuilder.mergeFrom(bytes).buildPartial(); try { abstractMessageBuilder.mergeFrom(bytes).build(); fail(); } catch (UninitializedMessageException ex) { // pass } // test DynamicMessage directly. Message.Builder dynamicMessageBuilder = DynamicMessage.newBuilder(TestRequiredForeign.getDescriptor()); // mergeFrom() should not throw initialization error. dynamicMessageBuilder.mergeFrom(bytes).buildPartial(); try { dynamicMessageBuilder.mergeFrom(bytes).build(); fail(); } catch (UninitializedMessageException ex) { // pass } }