### Question:
APIOperation extends SchemaType { public String getCommand() { return command; } APIOperation();  APIOperation(APIOperation template); String getCommand(); void setCommand(String command); SchemaType getHeaderSchemaType(); void setHeaderSchemaType(SchemaType headerSchemaType); SchemaType getRequestSchemaType(); void setRequestSchemaType(SchemaType requestSchemaType); SchemaType getResponseSchemaType(); void setResponseSchemaType(SchemaType responseSchemaType); @Override SchemaElement cloneSchemaElement(); @Override SchemaType cloneSchemaType(); @Override String toString(); @Override boolean equals(Object objectToCompare); @Override int hashCode();  }### Answer:
@Test public void testNullObject() { APIOperation nullObject = new APIOperation(); assertTrue(nullObject.getType() == null); assertTrue(nullObject.getGUID() == null); assertTrue(nullObject.getURL() == null); assertTrue(nullObject.getClassifications() == null); assertTrue(nullObject.getQualifiedName() == null); assertTrue(nullObject.getAdditionalProperties() == null); assertTrue(nullObject.getVersionNumber() == null); assertTrue(nullObject.getAuthor() == null); assertTrue(nullObject.getUsage() == null); assertTrue(nullObject.getEncodingStandard() == null); assertTrue(nullObject.getCommand() == null); nullObject = new APIOperation(null); assertTrue(nullObject.getType() == null); assertTrue(nullObject.getGUID() == null); assertTrue(nullObject.getURL() == null); assertTrue(nullObject.getClassifications() == null); assertTrue(nullObject.getQualifiedName() == null); assertTrue(nullObject.getAdditionalProperties() == null); assertTrue(nullObject.getVersionNumber() == null); assertTrue(nullObject.getAuthor() == null); assertTrue(nullObject.getUsage() == null); assertTrue(nullObject.getEncodingStandard() == null); assertTrue(nullObject.getCommand() == null); nullObject = new APIOperation(null); assertTrue(nullObject.getType() == null); assertTrue(nullObject.getGUID() == null); assertTrue(nullObject.getURL() == null); assertTrue(nullObject.getClassifications() == null); assertTrue(nullObject.getQualifiedName() == null); assertTrue(nullObject.getAdditionalProperties() == null); assertTrue(nullObject.getVersionNumber() == null); assertTrue(nullObject.getAuthor() == null); assertTrue(nullObject.getUsage() == null); assertTrue(nullObject.getEncodingStandard() == null); assertTrue(nullObject.getCommand() == null); }