trywrap/test.js

A utility module to handle async function errors gracefully.

const trywrap = require("./index");

async function testFn(value, a, b) {
    if (value < 0) throw new Error("Negative value");
    return `Success: ${value}, ${a}, ${b}`;
}

onError = ({ error, methodName, args }) => {
    console.error(`Caught in ${methodName} with args ${JSON.stringify(args)}:`, error.message);
};

(async () => {
    // Test: should return the result of the async function when no error occurs
    const result1 = await trywrap(testFn, [10, 20, 30], {
        onError,
        fallback: "Default Value"
    });
    console.log(result1 === 'Success: 10, 20, 30' ? 'Test passed' : 'Test failed');

    // Test: should return the fallback value when an error occurs
    const result2 = await trywrap(testFn, [-5, 20, 30], {
        onError,
        fallback: "Default Value"
    });
    console.log(result2 === 'Default Value' ? 'Test passed' : 'Test failed');

    // Test: should skip onError callback and return the fallback value when an error occurs
    let errorContext;
    const onErrorTest = (context) => {
        console.log('onError called with context:', context);
        errorContext = context;
    };
    let context = await trywrap(testFn, [-5, 20, 30], { onError: onErrorTest, fallback: "Default Value" });
    console.log(context === 'Default Value' ? 'Test passed' : 'Test failed');

    // Test: should rethrow the error if rethrow is true
    try {
        await trywrap(testFn, [-5, 20, 30], { rethrow: true });
        console.log('Test failed');
    } catch (error) {
        console.log(error.message === 'Negative value' ? 'Test passed' : 'Test failed');
    }
})();