### Question:
UpdateExpression extends JsonObject { public static UpdateExpression fromJson(JsonNode node) { if (node instanceof ArrayNode) { return UpdateExpressionList.fromJson((ArrayNode) node); } else { return PartialUpdateExpression.fromJson((ObjectNode) node); } }  static UpdateExpression fromJson(JsonNode node);  }### Answer:
@Test public void testFromJson() { System.out.println("fromJson"); JsonNode node = null; UpdateExpression expResult = null; UpdateExpression result = UpdateExpression.fromJson(node); assertEquals(expResult, result); fail("The test case is a prototype."); }