works perfectly when props.code updates unless it updates as a result of the page changing via react router, then it includes extra junk before the correct output.

testOutput.tsx:

    const runTest = (code: string) => {
        setResult([]);
        let t = props.currentChallenge.expectedOutputs.map((x) => {
            const d = x.in.length === 1 ? x.in[0] : x.in[0] + "," + x.in[1];
            const str =
                code +
                " " +
                props.currentChallenge.functionName +
                "(" +
                d +
                ")";
            evaluate(str).then((s) => {
                let passed = true;
                if (s != x.out) passed = false;
                let message = "Expected " + x.out + " got " + s;
                if (passed) message += " Passed!n";
                else message += " Failed!n";
                setResult((e) => [...e, message]);
            });
        });
    };

    useEffect(() => {
        runTest(props.code);
    }, [props]);

https://github.com/jbud/DevOps-Coding-Challenges