When a test encounters an unexpected error, only the top level error is printed. This makes it difficult to debug the actual underlying cause of these test failures.

For example, I have the following test which throws a null pointer.

const {test} = require("uvu");

test("error cause", () => {
    try {
        let a = null;
        a.hello();
    } catch (error) {
        throw new Error("Oh no! Something went wrong", {cause: error});
    }
});
test.run();

Running this test produces the following output.

✘   (0 / 1)

   FAIL  "error cause"
    Oh no! Something went wrong

    at Object.handler (/home/danwoz/testo/testo.js:8:15)
    at Number.runner (/home/danwoz/testo/node_modules/uvu/dist/index.js:88:16)
    at Timeout.exec [as _onTimeout] (/home/danwoz/testo/node_modules/uvu/dist/index.js:151:39)



  Total:     1
  Passed:    0
  Skipped:   0
  Duration:  2.59ms

This error would be a lot easier to debug if the original null pointer showed up in the stack trace.