I'm creating a unit test for nodejs project.

Here, I ran across the following error.

Error Message:

error TS2345: Argument of type 'string | number' is not assignable to parameter of type 'string'.
    Type 'number' is not assignable to type 'string'.

 const result = convertTimeStringToNumber(input);

I need to use 'input'(string) as an argument for convertTimeStringToNumber to get 'result'(number), so that i could compare result(number) with expectedResult(number).

I wanted to iterate over an array using test.each so that I can test many data pairs at once.

Please let me know how I could achieve this.

Here's my code and test code.

timeUil.ts

export function convertTimeStringToNumber(timeString) {
    return [timeString]
        .map(str => str.replace(':', ''))
        .map(parseInt)[0]
}

test.spec.ts

  const oldtimes = [['9:30', 930], ['11:00', 1100], ['14:34', 1434], ['19:45', 1945]];

  describe("convertTimeStringToNumber", () => {
    test.each(oldtimes)(
        "given %s, convert to %i", (input, expectedResult) => {
            const result = convertTimeStringToNumber(input);
            expect(result).toBe(expectedResult);
    });
  });