Generate incorrect JSON for a negative test in TypeScript

Struggling with navigating TS (amazing) static typing to generate invalid data for a negative test scenario.

I am currently working on resolving an issue where the client may pass invalid JSON (double quotes within the value). I believe I have fixed the issue, but I want to confirm this through a unit test.

Therefore, I need to input some invalid JSON into a method to confirm that it rejects bad data.

    postId: "1234",
    comment: "an invalid "comment"
  };

Can anyone suggest a method to construct the test data that mimics the invalid JSON?

//ts-ignore

doesn't seem to be providing the solution I need. I must be overlooking something obvious. TIA

Play around with it at https://codesandbox.io/s/competent-glitter-q8jn7

typescriptjestjs

Answer №1

Converting args to JSON will always result in a true value because JS objects are JSON serializable. To achieve the desired outcome, you can update your function as shown below:

function processComment(args: MyBespokeMutationArgsType): boolean {
  if (!isJsonString(`{ "comment": "${args.comment}" }`)) return false;
  console.log("comment will be processed");
  return true;
}

By the way, when dealing with invalid input, you can utilize template strings.

const inputData = {
  postId: "1234",
  comment: `valid "comment`
};

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