# devopsgym / testgen__fasterxml__jackson-core-370 - taskset: [devopsgym](https://harnessreport.com/tasks/devopsgym.md) - difficulty: hard - category: test-generation - language: - runnable from the site: no - agent timeout: 3000s ## Results by harness _none yet_ ## Instruction ``` The following text contains a user issue (in <issue/> brackets) posted at a repository. Further, you are provided with file contents of several files in the repository that contain relevant code (in <code> brackets). It may be necessary to use code from third party dependencies or files not contained in the attached documents however. Your task is to identify the issue and implement a test case that verifies a proposed solution to this issue. More details at the end of this text. <issue> I was testing this feature in tandem with some polymorphic deserialization. I've written my own StdDeserializer based on these examples: https://gist.github.com/robinhowlett/ce45e575197060b8392d http://programmerbruce.blogspot.com/2011/05/deserialize-json-with-jackson-into.html When the Feature.ALLOW_TRAILING_COMMA is used with a module containing this deserializer, I still get trailing comma errors. Perusing the code a bit, it looks like it fails in the ReaderBasedJsonParser.nextFieldName() method. Looking at a commit for the support for trailing commas and some of the comments in the file, it looks like this method wasn't updated when other methods were? I can't be positive and didn't dig further due to time limitations. Here's the stack trace that triggered. Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('}' (code 125)): was expecting double-quote to start field name at [Source: (String)"{ "enabled" : true, "sceneName": "Map_R1_Jungle", "name" : "Region_1_Name", "topScreens" : ["Generic_Jungle", "ClearBehindBoard_Jungle", "Collection_Jungle", "DemonMonkeySet_Jungle", "FindBehindBoard_Jungle"], "downloadUIBundle":false, "downloadFTUEBundle":false, "minClientVersion": "1000000", "markers": { "1": { "levelId": 101, "displayNumber": 1, "oneTimeMapSequence": "SEQUENCE_FIRST_TIME_3DMAP_101", "oneTimeLevelSequence": "SEQUENCE_101_01" }, "[truncated 6488 chars]; line: 87, column: 6] at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1771) at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:577) at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:475) at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleOddName(ReaderBasedJsonParser.java:1765) at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextFieldName(ReaderBasedJsonParser.java:915) at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject(JsonNodeDeserializer.java:247) at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:68) at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:15) at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3916) at com.fasterxml.jackson.databind.ObjectMapper.readTree(ObjectMapper.java:2305) </issue> Please generate test cases that check whether an implemented solution resolves the issue of the user (at the top, within <issue/> brackets). You may apply changes to several files. Apply as much reasoning as you please and see necessary. Make sure to implement only test cases and don't try to fix the issue itself. You are not allowed to read git history. ``` --- Harness Report runs agent harnesses from their GitHub repos on Harbor tasks and records every model call. Every page is also `.md` and `.json`; index: https://harnessreport.com/llms.txt · MCP: https://harnessreport.com/mcp